PUBLICATION
My research style has changed over time. First, there is a petrogenesis using opaque minerals (sulfide and oxide minerals, and carbonaceous materials) in rocks that was advanced when I was an undergraduate and graduate student of Waseda, Kanazawa and Tohoku Universities. After I got a job at Okayama University of Science, I became interested in K-Ar dating of volcanic and metamorphic rocks, and mineral resources. 7 years later, I shifted the axis of chronology with an interest in geology and petrology and have worked with many domestic and foreign researchers to contribute to solid earth science.
Table of contents
1 Phase equilibrium of Fe-Ti-O-S system
2 Graphitization of carbonaceous material
3 K-Ar dating of volcanic rocks
3-1 Basic research
3-2 Contribution to volcanic stratigraphy
3-3 Contribution to specific topics on tectonics
3-4 Collaboration with paleomagnetists
3-5 Collaboration with igneous petrologists
3-6 Collaboration with anthropologists
3-7 Collaboration with resource geologists
4 K-Ar geochronology of accretionary complexes
5 K-Ar (40Ar/39Ar) phengite dating of metamorphic rocks
5-1 Basic research
5-2 K-Ar (40Ar/39Ar) phengite geochronology of HP-UHP metamorphic rocks
5-3 K-Ar (40Ar/39Ar) mica dating of metamorphic sequences
6 Excess argon and its wave (EAW)
7 K-Ar (40Ar/39Ar) dating of igneous rocks and the related low P/T metamorphic rocks
8 Fault gouge dating
9 Contribution to Tectono-metamorphic evolution of the metamorphic belts
10 Collaboration with UHT metamorphic petrologists including Precambrian researchers
11 Chronological review of metamorphic belts
12 Others
1 Phase equilibrium of Fe-Ti-O-S system
The primary phase relationship of Fe-Ti-O-S system minerals in rock was clarified, and the problems of fluid composition estimation and fluid phase behavior were discussed. The geological bodies handled are Sanbagawa and New Caledonia high-pressure metamorphic rocks and Omine granites. The primary phase relationship of this system was determined using the inclusions in garnet with compositional zonal structure, because subsolidus reaction of these phases proceeds to low temperature. Based on the background of this system, I also dealt with the geo-thermometer and oxygen barometer, and the problem of sulfur solubility of dacite magma.
1) Itaya, T. (1975) Pyrrhotite from the Sanbagawa pelitic schists of the Shiraga-yama area, central Shikoku, Japan. Mineral. Jour., 8(1), 25-37.
2) Mariko, T., Tanaka, K. and Itaya, T. (1975) Oxide and sulphide minerals in pelitic and psammitic schists from the Nagatoro district, Saitama Prefecture, Japan. Jour. Min. Pet. Econ. Geol., 70(12), 413-424.
3) Itaya, T. and Otsuki, M. (1978) Stability and paragenesis of Fe-Ti oxide minerals and sphene in the basic schists of the Sanbagawa metamorphic belt in central Shikoku, Japan. Jour. Min. Pet. Econ. Geol., 73(12), 359-379. Research Encouragement Award from Japanese Association of Mineralogy, Petrology and Economic Geology
4) Itaya, T. (1980; 2021) On a geothermometer and an oxygen barometer using coexisting Fe-Ti oxides on a thermodynamic basis: a case of regular solution approximation. Jour. Min. Pet. Econ. Geol., 75, 69-76 (in Japanese); Engineering Geology of Japan, No. 11, 19-26 (Translation in English).
5) Itaya, T. and Banno, S. (1980) Paragenesis of titanium-bearing accessories in pelitic schists of the Sanbagawa metamorphic belt, central Shikoku, Japan. Contr. Mineral. Petrol., 73, 267-276.
6) Ueda, A. and Itaya, T. (1981) Microphenocrystic pyrrhotite from dacite rocks of Satsuma-Iwojima, southwest Kyushu, Japan and the solubility of sulfur in dacite magma. Contr. Mineral. Petrol., 78, 21-26.
7) Murata, M., Itaya, T. and Ueda, Y. (1983) Sulfide and oxide minerals from the Ohmine granitic rocks in Kii Peninsula, central Japan, and their primary paragenetic relations. Contr. Mineral. Petrol., 84, 58-65.
8) Itaya, T., Brothers, R.N. and Black, P.M. (1985) Sulfides, oxides and sphene in high-pressure schists from New Caledonia. Contr. Mineral. Petrol., 91, 151-162.
9) Murata, M. and Itaya, T. (1987) Sulfide and oxide minerals from S-type and I-type granitic rocks. Geochim. Cosmochim. Acta., 51(3), 497-507.
2 Graphitization of carbonaceous material
The crystallographic structure, chemical composition and reflectance of carbonaceous material in metamorphosed sedimentary rocks were investigated and the mechanism of graphitization was discussed. The geological bodies dealt with are the Sanbagawa high-pressure metamorphic rocks1 and the Tono contact metamorphic rocks2. Graphitization proceeds in two steps. First, graphite crystallites are formed in an amorphous coal-like material, and then the crystallite growth proceeds. This is a reaction of irreversible processes, indicating the graphitization is a function of time and temperature. However, it is possible to discuss the thermal structure in each metamorphic sequence by using the degree of graphitization. In particular, it was shown to be effective in determining the thermal structure in the low-grade zone. This method was applied to reveal the temperature – age relation of the metamorphic sequences in Japan, New Zealand, Australia and Western Alps for which the publications are listed in the later description on K-Ar dating of HP-UHP metamorphic micas.
1) Itaya, T. (1981) Carbonaceous material in pelitic schists of the Sanbagawa metamorphic belt in central Shikoku, Japan. Lithos, 14, 215-224.
2) Okuyama-Kusunose, Y. and Itaya, T. (1987) Metamorphism of carbonaceous material in the Tono contact aureole, Kitakami Mountains, Japan. J. Metamorphic Geol., 5, 121-139.
3) Itaya, T., Tomuro, M. and Ninagawa, K. (1997) Asymmetric X-ray diffraction peak of metamorphosed carbonaceous material. The Island Arc., 6(2), 228-232.
3 K-Ar dating of volcanic rocks
High-performance mass spectrometer for noble gases and the noble gas analysis technology were applied to K-Ar dating of volcanic rocks in Japan, Kenya, New Zealand, Korea, Hungary, Romania and Indonesia. This opened a new path for dating young volcanic rocks. Significantly increased the resolution of volcanic activity and contributed to the establishment of the volcanic stratigraphy, resulting in contribution to specific topics on tectonics. Based on these, I carried out many joint researches with paleomagnetists, igneous petrologists, anthropologists and resource geologists. Argon isotope mass fractionation correction method was proposed to apply to Bratan volcano dating, Indonesia.
3-1 Basic research
1) Nagao, K., Nishido, H., Itaya, T. and Ogata, K. (1984) K–Ar age determination method. Bulletin of Hiruzen Research Institute, 9, 19–38 (in Japanese).
2) Nagao, K. and Itaya, T. (1988) K-Ar age determination. Mem. Geol. Soc. Japan, 29, 5-21 (in Japanese).
3) Itaya, T. and Nagao, K. (1988) K-Ar age determination of volcanic rocks younger than 1 Ma. Mem. Geol. Soc. Japan. 29, 143-161 (in Japanese).
4) Itaya, T., Nagao, K., Inoue, K., Honjou, Y., Okada, T. and Ogata, A. (1991) Argon isotope analysis by a newly developed mass spectrometric system for K-Ar dating. Mineral. Jour., 15(5), 203-221.
5) Itaya, T., Ito, H. and Nagao, K. (1991) Degassing of argon from young geological materials by low temperature stepwise heating. Mineral. Jour., 15(7), 309-320.
6) Itaya, T., Doi, M. and Ohira, T. (1996) Very low potassium analysis by flame photometry using ultra low blank chemical lines: an application of K-Ar method to ophiolites. Geochemical J., 30(1), 31-39.
7) Itaya, T., Arribas, A. Jr. and Okada, T. (1996) Argon release systematics of hypogene and supergene alunite based on progressive heating experiments from 100 to 1000°C. Geochimica et Cosmochimica Acta, 60(22), 4525-4535.
8) Itaya, T. and Hyodo, H. (2009) K-Ar (40Ar/39Ar) method. in Digital Book: Progress in Quaternary Research in Japan,The Japan Association for Quaternary Research, pp. 11-194 - 11-244 (in Japanese).
9) Ryu, S., Kitagawa, H., Nakamura, E., Itaya, T. and Watanabe, K. (2013) K-Ar analyses of the post-caldera lavas of Bratan volcano in Bali Island, Indonesia - Ar isotope mass fractionation to light isotope enrichment –. Journal of Volcanology and Geothermal Research, 264, 107-116.
3-2 Contribution to volcanic stratigraphy
1) Itaya, T., Nagao, K., Nishido, H. and Ogata, K. (1984) K-Ar age determination of late Pleistocene volcanic rocks. Jour. Geol. Soc. Japan, 90(12), 899-909.
2) Itaya, T. and Sawada, Y. (1987) K-Ar ages of volcanic rocks in the Samburu Hills area, Northern Kenya. African Study Monographs. Suppl. Issue, 5, 27-45.
3) Itaya, T., Okada, T., Onoe, T. and Isshiki, N. (1989) K-Ar ages of the Middle Pleistocene Takahara volcano, central Japan and argon release processes in cooling lava. Mass Spectroscopy, 37(6), 365-374.
4) Ebihara, N., Itaya, T. and Nomura, N. (1989) Chemical compositions and K-Ar ages of Pliocene volcanic rocks along Aimagawa river, western Gumma, central Japan. Geochemical Jour., 23, 149-160.
5) Briggs, R.M., Itaya, T., Lowe, D.J. and Keane, A.J. (1989) Ages of the Pliocene-Pleistocene Alexandra and Ngatutura volcanics, western North Island, New Zealand, and some geological implications. NZ Jour. Geol. Geophys., 32, 417-427.
6) Morris, P.A., Itaya, T., Watanabe, T. and Yamauchi, S. (1990) Potassium/argon ages of Cenozoic igneous rocks from eastern Shimane Prefecture-Oki Dozen Island, southwest Japan and the Japan sea opening. Jour. SE Asian Earth Sci., 4(2), 125-131.
7) Okada, T., Itaya, T., Sawa, I. and Hong, S. (1991) K-Ar age determination of lava stalagmite in Manjang gul in Jeju island, Korea. Jour. SE Asian Earth Sci., 6(2), 127-130.
8) Black, P.M., Briggs, R.M., Itaya, T., Dewes, E.R., Dunbar, H.M., Kawasaki, K., Kuschel, E. and Smith, I.E.M. (1992) K-Ar age data and geochemistry of the Kiwitahi volcanics, western Hauraki Rift, Northland, New Zealand. NZ. Jour. Geol. Geophys., 35, 403-413.
9) Ohki, J., Shuto, K., Watanabe, N. and Itaya, T. (1993) K-Ar ages of the Miocene Ryozen basalts from the northern margin of the Abukuma Highland, Japan. J. Min. Petr. Econ. Geol., 88(6), 313-319.
10) Watanabe, N., Takimoto, T., Shuto, K. and Itaya, T. (1993) K-Ar ages of the Miocene volcanic rocks from the Tomari area in the Shimokita Peninsula, Northeast Japan arc. J. Min. Petr. Econ. Geol., 88(7), 352-358.
11) Briggs, R.M., Okada, T., Itaya, T., Shibuya, H. and Smith, Ian.E.M. (1994) K-Ar ages, paleomagnetism and geochemistry of the South Auckland volcanic field, North Island, New Zealand. NZ. Jour. Geol. Geophys, 37, 143-153.
12) Pushchin, I.K., Tararin, I.A., Konovalov, Yu.I., Itaya, T. and Ballance, P.F. (1996) K-Ar age of basalts from the Kermadec tectonic system. Doklady Rosiiskoy Akademii Nauk, 350(1), 108-111 (in Russian).
13) Morris, P.A. and Itaya, T. (1997) The Matsue Formation: Evidence for gross mantle heterogeneity beneath southwest Japan at 11Ma. The Island Arc, 6, 337-352.
14) Morris, P.A., Itaya, T., Iizumi, S., Kagami, H., Watling, R.J. and Murakami, H. (1997) Age relations and petrology of alkali igneous rocks from Oki Dozen, Southwest Japan. Geochemical Journal, 31, 135-154.
15) Briggs, R.M., Rosenberg, M.D., de Lang, P.J., Itaya, T., King, P.R. and Price, R.C. (1997) Geology and geochemistry of Gannet (Karewa) island, Tasman Sea: a rift-related nephelinitic tuff ring. NZ. Jour. Geol. Geophys, 40, 263-273.
16) Aoki, A., Shuto, K. and Itaya, T. (1999) Stratigraphy and K-Ar ages of Tertiary volcanic rocks in the Hamamasu area, northwestern Hokkaido, Japan. Jour. Geol. Soc. Japan, 105(5), 341-351.
17) Goto, Y., Funayama, A., Gouchi, N. and Itaya, T. (2000) K-Ar ages of the Akan-Shiretoko volcanic chain lying oblique to the Kurile trench: Implications for tectonic control of volcanism. The Island Arc, 9(2), 204-218.
18) Tararin, I.A., Lelikov, E.P. and Itaya, T. (2000) Pleistocene submarine volcanism of eastern part of the Kurile Basin (Okhotsk Sea). Dokl. Acad. Nauk Russia, v. 371, No 3, p. 366-370.
19) Hayward, BW., Black, PM., Smith, IEM., Ballance, FF., Itaya, T., Doi, M., Takagi, M., Bergman, S., Adams, CJ., Herzer, RH. and Robertson, DJ. (2001) K-Ar ages of early Miocene arc-type volcanoes in northern New Zealand. NZ. Jour. Geol. Geophys., 44, 285-311.
20) Balogh, K., Itaya, T., Németh, K., Martin, U., Wijbrans, J. and Thanh, N.X. (2005) Study of controversial K/Ar and 40Ar/39Ar ages of the Pliocene alkali basalt of Hegyestu, Balaton Highland, Hungary: A progress report. Mineralia Slovaca, 37, 298-300.
21) Balogh, K., Németh K., Itaya T., Molnár F., Stewart R., Thanh N. X., Hyodo H., Daróczi L. (2010) Loss of 40Ar(rad) from leucite-bearing basanite at low temperature: Implications on K/Ar dating. Central European Journal of Geosciences 2(3), 385-398.
22) Ryu, S. Y., Oka, M., Yagi, K., Sakuyama, T. and Itaya, T. (2011) K-Ar ages of the Quaternary Basalts in the Jeongok area, the central part of Korean Peninsula. Geosciences Journal, 15 (1), 1-8.
23) Kiyosugi, K., Horikawa, Y., Nagao, T., Itaya, T., Connor, C.B. Tanaka, K. (2014) Scoria cone formation through a violent Strombolian eruption: Irao Volcano, SW Japan. Bulletin of Volcanology, 76. DOI 10.1007/s00445-013-0781-7
3-3 Contribution to specific topics on tectonics
1) Johnson, LE., Fryer, P., Taylor, B., Silk, M., Jones, DL., Sliter, WV., Itaya, T. and Ishii, T. (1991) New evidence for crustal accretion in the outer Mariana fore arc: Cretaceous radiolarian cherts and mid-ocean ridge basalt-like lavas. Geology, 19, 811-814.
2) Shimizu, S. and Itaya, T. (1993) Plio-Pleistocene arc-volcanism controlled by two overlapping subducted plates, central Japan. Tectonophysics, 225, 139-154.
3) Smith, Ian E.M., Okada, T., Itaya, T. and Black, P.M. (1993) Age relationships and tectonic implications of late Cenozoic basaltic volcanism in Northland, New Zealand. NZ. Jour. Geol. Geophys, 36, 385-393.
4) Ohki, J., Watanabe, N., Shuto, K. and Itaya, T. (1993) Shifting of the volcanic fronts during Early to Late Miocene age in the Northeast Japan arc. The Island Arc, 2, 87-93.
5) Shuto, K., Ohki, J., Kagami, H., Yamamoto, M., Watanabe, N., Yamamoto, K., Anzai, N. and Itaya, T. (1993) The relationships between drastic changes in Sr isotope ratios of magma sources beneath the NE Japan arc and the spreading of the Japan Sea back-arc basin. Mineralogy and Petrology, 49, 71-90.
6) Ballance, P.F., Ablaev, A.G., Pushchin, I.K., Pletnev, S.P., Birylina, M.G., Itaya, T., Follas, H.A. and Gibson, G.W. (1999) Morphology and history of the Kermadec trench - arc - backarc basin - remnant arc system at 30 to 32oS: geophysical profile, microfossil and K-Ar data. Marine Geology, 159, 35-62.
3-4 Collaboration with paleomagnetists
1) Otofuji, Y., Itaya, T. and Matsuda, T. (1991) Rapid rotation of southwest Japan -paleomagnetism and K-Ar ages of Miocene volcanic rocks of southwest Japan-. Geophys. J. Int., 105, 397-405.
2) Soengkono, S., Hochstein, M.P., Smith, I.E.A. and Itaya, T. (1992) Geophysical evidence for widespread reversely magnetised pyroclastics in the western Taupo Volcanic Zone (New Zealand). NZ. Jour. Geol. Geophys., 35, 47-55.
3) Shibuya, H., Cassidy, J., Smith, IEA. and Itaya, T. (1992) A geomagnetic excursion in the Brunhes epoch recorded in New Zealand basalts. Earth Planet. Sci. Lett., 111, 41-48.
4) Lee, H.K., Moon, H-S., Min, K.D., Kim, I-S., Yun, H. and Itaya, T. (1992) Paleomagnetism, Stratigraphy and Geologic structure of the Tertiary Pohang and Chaggi Basins; K-Ar ages for the volcanic rocks. Jour. Korean Inst. Mining Geol., 25(3), 337-349 (in Korean).
5) Otofuji, Y., Itaya, T., Wang, H.C. and Nohda, S. (1995) Paleomagnetism and K-Ar dating of Pleistocene volcanic rocks along the Altyn Tagh fault, Northern Border of Tibet. Geophysical Journal International, 120, 367-374.
6) Otofuji, Y., Matsuda, T., Itaya, T., Shibata, T., Matsumoto, M., Yamamoto, T., Morimoto, C., Kulinich, RG., Zimin PS., Matunin, AP., Sakhno, VG. and Kimura K. (1995) Late Cretaceous to early Paleogene paleomagnetic results from Sikhote Alin, far eastern Russia: implications for deformation of East Asia. Earth Planet. Sci. Lett., 130, 95-108.
7) Shibuya, H., Cassidy, J., Smith, Ian E.M. and Itaya, T. (1995) Paleomagnetism of young New Zealand basalts and longitudinal distribution of paleosecular variation. J. Geomag. Geoelectr., 47, 1011-1022.
8) Morimoto, C., Otofuji, Y., Miki, M., Tanaka, H. and Itaya, T. (1997) Preliminary paleomagnetic results of an Archean dolerite dyke of west Greenland: geomagnetic field intensity at 2.8Ga. Geophys. J. Int. 128, 585-593.
9) Panaiotu, CG., Pecskay, Z., Hamback, U., Seghedi, I., Paniotu, CE., Itaya, T., Orleanu, M. and Szakacs, A. (2004) Short-lived Quaternary volcanism in the Persani mountains (Romania) revealed by combined K-Ar and Paleomagnetic data. Geologica Carpathica, 55, 4, 333-339.
10) Baba, K.A., Matsuda, T., Itaya, T., Wada, Y., Hori, N., Yokoyama, M., Eto, N., Kamei, R., 23) Zaman, H., Kidane, T. and Otofuji, Y. (2007) New age constraints on counter-clockwise rotation of NE Japan. Geophysical J. Int., 171, 1325-1341.
11) Tonai, S., Suganuma, Y., Ashi, J., Itaya, T., Oiwane, H. and Kiyokawa, S. (2011) Differential timing of vertical-axis block rotations in the northern Ryukyu Arc: paleomagnetic evidence from the Koshikijima Islands, Japan. Tectonophysics, 497, 71-84. doi:10.1016/j.tecto.2010.11.003
3-5 Collaboration with igneous petrologists
1) Tatsumi, Y., Kimura, N., Itaya, T., Koyaguchi, T., Suwa, K. (1991) Intermittent upwelling of asthenosphere beneath the Gregory Rift, Kenya. Geophysical Research Letters, 18 (6), 1111-1114.
2) Tatsumi, Y., Ishikawa, N., Anno, K. and Itaya, T. (2001) Tectonic setting of high-Mg andesite magmatism in the SW Japan arc: K-Ar chronology of the Setouchi volcanic belt. Geophys. J. Int., 144, 625-631.
3) Shinjo, R., Chekol, T., Meshesha, D., Itaya, T. and Tatsumi, Y. (2011) Geochemistry and geochronology of the mafic lavas from the southeastern Ethiopian rift (the East African Rift System): assessment of models on magma sources, plume-lithosphere interaction and plume evolution. Contributions to Mineralogy and Petrology, 162, 209-230.
4) Sakuyama, T., Nagaoka, S., Miyazaki, T., Chang, Q., Takahashi, T., Hirahara, Y., Senda, R., Itaya, T., Kimura, J-I and Ozawa, K. (2014) Melting of the Uppermost Metasomatized Asthenosphere Triggered by Fluid Fluxing from Ancient Subducted Sediment: Constraints from the Quaternary Basalt Lavas at Chugaryeong Volcano, Korea. Journal of Petrology, 55 (3), 499-528.
3-6 Collaboration with anthropologists
1) Sawada, Y., Pickford, M., Itaya, T., Makinouchi, T., Tateishi, M., Kabeto, K., Ishida, S. and Ishida, H. (1998) K-Ar ages of Miocene Hominoidea (Kenyapithecus and Samburupithecus) from Samburu Hills, Northern Kenya. C. R. Acad. Sci. Paris / Earth, Planet Sci., 326, 445-451.
2) Sawada, Y., Pickford, M., Senut, B., Itaya, T., Hyodo, M., Miura, T., Kashine, C., Chujo, T. and Fujii, H. (2002) The age of Orrorin tugenensis, an early hominid from the Tugen Hills, Kenya. C. R. Palevol, 1, 293-303.
3) Pickford, M., Sawada, Y., Tayama, R., Matsuda, Y., Itaya, T., Hyodo, H. and Senut, B. (2006) Refinement of the age of the Middle Miocene Fort Ternan beds, Western Kenya, and its implications for Old World biochronology. C. R. Geoscience, 338, 545-555.
4) Kunimatsu, Y., Nakatsukasa, M., Sawada, Y., Sakai, Y., Hyodo, M., Hyodo, H., Itaya, T., Nakaya, H., Saegusa, H., Mazurier, A.. Mototaka Saneyoshi, M., Tsujikawa, H., Yamamoto, A., and Mbua, E. (2007) A new Late Miocene great ape from Kenya and its implications for the origins of African great apes and humans. PNAS, Proceedings of National Academy of Sciences of the United States of America, 104(49), 19220-25.
5) Katoh, S., Beyene, Y., Itaya, T., Hyodo, H., Hyodo, M., Yagi, K., Gouzu, C., WoldeGabriel, G., Hart, W. K., Ambrose, S.H., Nakaya, H., Bernor, R.L., Boisserie, J-R., Bibi, F., Saegusa, H., Sasaki, T., Sano, K., Asfaw, B. and Suwa, G. (2016) New geological and paleontological age constraint for the gorilla-human lineage split. Nature, 530, 215-218.
6) Sawada, Y., Zaree, G.R., Sakai, T., Itaya, T., Yagi, K., Imaizumi, M., Ataabadi, M.M. and Fortelius, M. (2016) K–Ar ages and petrology of the late Miocene pumices from the Maragheh Formation, northwest Iran. Palaeobiodiversity and Palaeoenvironments, Vol.96, Issue 3, 399-431.
3-7 Collaboration with resource geologists
1) Sawai, O., Okada, T. and Itaya, T. (1989) K-Ar ages of sericite in hydrothermally altered rocks around the Toyoha deposits, Hokkaido, Japan. Mining Geol., 39(3), 191-204.
2) Lee, H.K., Kim, S.J., Yun, H., Choi, W.C., Song, Y.S. and Itaya, T. (1993) K-Ar age of the Keumseongsan volcanic rocks and mineralization in the Southeastern part of Euiseong, Gyeongsangbuk-Do, Republic of Korea. Jour. Korean Inst. Mining Geol., 26(4), 445-454 (in Korean).
3) Arribas, A. Jr., Hedenquist, J. W., Itaya, T., Okada, T., Concepcion, R. A. and Garcia, R.S. Jr. (1995) Contemporaneous formation of adjacent porphyry and epithermal Cu-Au deposits over 300ka in northern Luzon, Philippines. Geology, 23(4), 337-340.
4) Zeng, N., Izawa, E., Watanabe, K. and Itaya, T. (1996) Timing of Au-Ag mineralization and related volcanism at Otoge, Yamagata Prefecture, Northeast Japan. Jour. Min. Pet. Econ. Geol., 91(8), 297-304.
5) Imaoka, T., Nakashima, K., Itaya, T. and Okada, T. (2001) Timing of hydrothermal activity in the Oligocene Hamada cauldron, SW Japan: evidence from K-Ar ages of sericites. Mineral Resources, 51(1), 55-62.
6) Pecskay, Z., Molnar, F., Itaya, T. and Zelenka, T. (2005) Geology and K-Ar geochronology of illite from the clay deposit at Fuzerradvany, Tokaj Mts., Hungary. ACTA Mineralogica – Petrographica, 46, 1-7.
7) Trung, N. M., Tsujimori, T. and Itaya,T. (2006) Honvang serpentinite body of the Song Ma fault zone, northern Vietnam: A remnant of oceanic lithosphere within the Indochina–South China suture. Gondwana Res., 9, 225-230.
8) Trung, N.M., Nuong, N.D. and Itaya. T. (2007) Rb-Sr Isochron and KAr ages of igneous rocks from the Samnua Depression Zone in Northern Vietnam. J. Min. Pet. Sci., 102(2), 86-92.
9) Sasaki, Y., Imaoka, T., Nagashima, M., Nakashima, K., Sonehara, T., Yagi, K. and Itaya, T. (2016) The Cretaceous Ofuku pluton and its relation to mineralization in the western Akiyoshi plateau, Yamaguchi Prefecture, Japan. Resource Geology, 66 (no. 2), 85-113.
Resource Geology Best Article Award 2016
10) Bounliyong P, Itaya T, Arribas A, Watanabe Y, Wong H, Echigo T. (2021) K–Ar geochronology of orogenic gold mineralization in the Vangtat gold belt, southeastern Laos: Effect of excess argon in hydrothermal quartz. Resource Geology. 2021;71:161–175. https://doi.org/10.1111/ rge.12258
4 K-Ar geochronology of accretionary complexes
The rapid and highly sensitive argon analyses was applied to the dating of fine-grained metamorphic micas of accretionary complex in SW Japan and New Zealand. This approach contributed to the construction of a new model on the geological zonal structure in SW Japan. In this active research, a newly coined word “the age mapping of metamorphic belts” was born.
1) Isozaki, Y. and Itaya, T. (1989) Origin of schist clasts of Upper Cretaceous Onogawa Group, southwest Japan. Jour. Geol. Soc. Japan, 95(5), 361-368.
2) Suzuki, H., Isozaki, Y. and Itaya, T. (1990) Tectonic superposition of the Kurosegawa Terrane upon the Sanbagawa Metamorphic Belt in eastern Shikoku, Southwest Japan -K-Ar ages of weakly metamorphosed rocks in northeastern Kamikatsu Town, Thokushima Prefecture-. Jour. Geol. Soc. Japan, 96(2), 143-153 (in Japanese).
3) Mackenzie, J.S., Taguchi, S. and Itaya, T. (1990) Cleavage dating by K-Ar isotopic analysis in the Paleogene Shimanto belt of eastern Kyushu, S.W. Japan. J. Min. Petr. Econ. Geol., 85(4), 161-167.
4) Isozaki, Y., Itaya, T. and Kawato, K. (1990) Metamorphic ages of Jurassic accretionary complex in the Northern Chichibu belt, Southwest Japan. Jour. Geol. Soc. Japan, 96(7), 557-560 (in Japanese).
5) Isozaki, Y. and Itaya, T. (1990) K-Ar ages of weakly metamorphosed rocks at the northern margin of Kurosegawa Terrane in central Shikoku and western Kii Peninsula -extent of the Kurosegawa Terrane in Southwest Japan-. Jour. Geol. Soc. Japan, 96(8), 623-639 (in Japanese).
6) Takami, M., Isozaki, Y., Nishimura, Y. and Itaya, T. (1990) Geochronology of weakly metamorphosed Jurassic accretionary complex (the Kuga Group) in eastern Yamaguchi Prefecture, Southwest Japan. Jour. Geol. Soc. Japan, 96(8), 669-681 (in Japanese).
7) Isozaki, Y. and Itaya, T. (1991) Pre-Jurassic klippe in northern Chichibu belt in west-central Shikoku, Southwest Japan – Kurosegawa Terrane as a tectonic outlier of the pre-Jurassic rocks of the Inner Zone-. Jour. Geol. Soc. Japan, 97(6), 431-450 (in Japanese).
Best Paper Award from Geological Society of Japan
8) Kawato, K., Isozaki, Y. and Itaya, T. (1991) Geotectonic boundary between the Sanbagawa and Chichibu belts in central Shikoku, Southwest Japan. Jour. Geol. Soc. Japan, 97(12), 959-975 (in Japanese).
9) Isozaki, Y., Hashiguchi, T. and Itaya, T. (1992) The Kurosegawa klippe: an examination. Jour. Geol. Soc. Japan, 98(10), 917-941 (in Japanese).
10) Takeda, K., Makisaka, S., Itaya, T., Nishimura, Y. (1993) The Maana belt in the Mikame area, western edge of Shikoku, Southwest Japan –composition and geotectonic setting-. Journal of Geological Society of Japan 99(4), 255-279 (in Japanese).
11) Takami, M., Isozaki, Y., Nishimura, Y. and Itaya, T. (1993) Effect of detrital white mica and contact metamorphism to K-Ar dating of weakly metamorphosed accretionary complex -an example of Jurassic accretionary complex in eastern Yamaguchi Prefecture, Southwest Japan. Jour. Geol. Soc. Japan, 99(7), 545-563 (in Japanese).
12) Suzuki, H. and Itaya, T. (1994) Accretionary complexes of the Kurosegawa, Northern Chichibu and Sanbagawa belts in the Kamikatsu Town area (Shikoku), Southwest Japan. Jour. Geol. Soc. Japan, 100(8), 585-599 (in Japanese).
13) Takami, M. and Itaya, T. (1996) Episodic accretion and metamorphism of Jurrasic accretionary complex based on biostratigraphy and K-Ar geochronology in the western part of the Mino-Tanba Belt, Southwest Japan. The Island Arc, 5(3), 321-336.
14) Takami, M. and Itaya, T. (1998) K-Ar ages of pelagic sedimentary rocks from Jurassic accretionary complex in eastern Yamaguchi Prefecture, Southwest Japan and their geologic significance. Journal of Geological Society of Japan 104, 149-158 (in Japanese).
15) Nishimura, Y., Black, P.M. and Itaya, T. (2004) Metamorphism and metamorphic K-Ar ages of the Mesozoic accretionary complex in Northland, New Zealand. Island Arc, 13 (3), 416-431.
16) Hasashi Asanuma, Wataru Fujisaki, Tomohiko Sato, Shuhei Sakata, Yusuke Sawaki, Kazumasa Aoki, Yoshihiro Okada, Shigenori Maruyama, Takafumi Hirata, Tetsumaru Itaya, Brian F. Windley (2017) New isotopic age data constrain the depositional age and accretionary history of the Neoproterozoic-Ordovician Mona Complex (Anglesey-Lleyn, Wales). Tectonophysics, 706-707, 164-195.
5 K-Ar (40Ar/39Ar) phengite dating of metamorphic rocks
The rapid and highly sensitive K-Ar analyses and the laser-heating 40Ar/39Ar analyses were applied to the dating of the phengitic white mica from metamorphic rocks in Japan, Himalaya, Vietnam, Nigeria, Western Alps, Eastern Australia, Korea and Egypt of which the host lithologies are oceanic. This approach has contributed to understand phengite geochronology of HP-UHP metamorphic rocks and geochronology of unknown metamorphic sequences.
5-1 Basic research
1) Hyodo, H., Matsuda, T., Fukui, S. and Itaya, T. (1994) 40Ar/39Ar age determination of a single mineral grain by Laser step heating. Bulletin of Research Institute of Natural Sciences, Oka- yama University of Science, 20, 63–67 (in Japanese with English Abstract).
2) Hyodo, H., Itaya, T. and Matsuda, T. (1995) Temperature measurement of small minerals and its precision using Laser heating. Bulletin of Research Institute of Natural Sciences, Okayama University of Science, 21, 3–6 (in Japanese with English Abstract).
3) Hyodo, H., Kim, S., Itaya, T. and Matsuda, T. (1999) Homogeneity of neutron flux during irradiation for 40Ar/39Ar age dating in the research reactor at Kyoto University. Jour. Min. Pet. Econ. Geol., 94(9), 329-337.
4) Itaya, T. and Fujino, M. (1999) K-Ar age - chemistry - fabric relations of phengite from the Sanbagawa high pressure schists, Japan. The Island Arc, 8, 523-536.
5) Takeshita, H., Gouzu C. and Itaya, T. (2004) Chemical features of white micas from the Piemonte calcschists, western Alps and implications for K-Ar ages of metamorphism. Gondwana Research, 7(2), 457-466.
6) Gouzu, C., Itaya, T. and Takeshita, H. (2005) Interlayer cation vacancies of phengites in calcschists from Piemonte zone, western Alps, Italy. Jour. Mineral. Petrol. Sci., 100, 143-149.
5-2 K-Ar (40Ar/39Ar) phengite geochronology of HP-UHP metamorphic rocks
1) Itaya, T. and Takasugi, H. (1988) Muscovite K-Ar ages of the Sanbagawa schists, Japan and argon depletion during cooling and deformation. Contri. Mineral. Petrol., 100, 281-290.
2) Itaya, T. and Fukui, S. (1994) Phengite K-Ar ages of schists from the Sanbagawa southern marginal belt, central Shikoku, SW Japan: Influence of detrital mica and deformation on age. The Island Arc, 3, 48-58.
3) Takeshita, H., Shimoya, H and Itaya, T. (1994) White mica K-Ar ages of blueschist-facies rocks from the Piemeonte "calcschists" in the western Italian Alps. The Island Arc, 3, 151-162.
4) Nishimura, Y., Coombs, D.S., Landis, C.A. and Itaya, T. (2000) Continuous metamorphic gradient documented by graphitization and K-Ar age, southeast Otago, New Zealand. American Mineralogist, 85, 1625-1636. American Mineralogist Best Paper Award 2000
5) Miyashita, A. and Itaya, T. (2002) K-Ar age and chemistry of phengite from the Sanbagawa schists in the Kanto Mountains, central Japan, and their implication for exhumation tectonics. Gondwana Research, 5(4), 837-848.
6) Gouzu, C., Itaya, T., Hyodo, H.and Matsuda, T. (2006) Excess 40Ar-free phengite in ultrahigh-pressure metamorphic rocks from the Lago di Cignana area, Western Alps. Lithos, 92, 418-430. doi:10.1016/j.lithos.2006.03.056.
7) Nuong, N.D., Itaya, T. and Nishimura, Y. (2008) Age (K-Ar phengite)-temperature-structure relations: A case study from the Ishigaki high-pressure schist belt, southern Ryukyu Arc, Japan. Geological Magazine, 145, 677-684. doi:10.1017/S0016756808004998
8) Nuong, N.D., Thanh, N.X., Gouzu, C. and Itaya, T. (2011) Phengite geochronology of the crystalline schists in the Sakuma-Tenryu district, central Japan. Island Arc, 20, 401-410. doi:10.1111/j.1440-1738.2011.00773.x
9) Gouzu, C., Yagi, K., Thanh, N. X., Itaya, T. and Compagnoni, R. (2016) White mica K-Ar geochronology of HP-UHP units in the Lago di Cignana area, western Alps, Italy: Tectonic implications for exhumation. Lithos, 248–251, 109–118.
10) Itaya, T. (2020) K-Ar phengite geochronology of HP-UHP metamorphic rocks-An in-depth review-. Journal of Mineralogical and Petrological Sciences, 115, 44-58. doi:10.2465/jmps.190123
5-3 K-Ar (40Ar/39Ar) mica dating of metamorphic sequences
1) Nishimura, Y., Itaya, T., Isozaki, Y. and Kameya, A. (1989) Depositional ages and metamorphic history of 220 Ma high P/T type metamorphic rocks: an example of the Nishiki-cho area,Yamaguchi Prefecture, southwest Japan. Mem. Geol. Soc. Japan, 33, 143-166 (in Japanese).
2) Yokoyama, K. and Itaya, T. (1990) Clasts of high-grade Sanbagawa schist in Middle Eocene conglomerates from the Kuma Group, central Shikoku, southwest Japan. J. Metamorphic Geol., 8, 467-474.
3) Shibakusa, H. and Itaya, T. (1992) K-Ar ages of glaucophane schists and associated rocks from the Horokanai-Kamietanbetsu area in the Kamuikotan zone, Hokkaido, northern Japan. Jour. Geol. Soc. Japan, 98, 1061-1064.
4) Arita, K., Shingu, H. and Itaya, T. (1993) K-Ar geochronological constraints on tectonics and exhumation of the Hidaka metamorphic belt, Hokkaido, northern Japan. J. Min. Petr. Econ. Geol., 88(3), 101-113.
5) Sorkhabi, R.B., Jain, A.K., Itaya, T., Nishimura, S., Manickavasagam, Rm. and Lal, N. (1993) K/Ar cooling ages from Zanskar Himalaya: implications for the tectonics and exhumation of Higher Himalayan metamorphic complex. Current Science, 65(9), 687-693.
6) Sorkhabi, R.B., Jain, A.K., Nishimura, S., Itaya, T., Lal, N., Manickavasagam, Rm. and Tagami, T. (1994) New Age constraints on the cooling and unroofing history of the Trans- Himalayan Ladakh Batholith (Kargil area), N.W. India. Proceedings of the Indian Academy of Sciences (Earth and Planetary Science), 103(1), 83-97.
7) Fukui, S., Watanabe, T., Itaya, T. and Leitch, Evan C. (1995) Middle Ordovician high P/T metamorphic rocks in eastern Australia: Evidence from K-Ar ages. Tectonics, 14(4), 1014-1020.
8) Iwasaki, I., Watanabe, T., Itaya, T., Yamazaki, M. and Takigami, Y. (1995) Palaeogene K-Ar ages from the Kamuikotan metamorphic rocks, southern area of the Kamuikotan gorge, central Hokkaido, northern Japan. Geological Journal, 30, 281-295.
9) Sorkhabi, R.B., Jain, A.K., Itaya, T., Fukui, S., Lal, N. and Kumar, A. (1997) Cooling age record of domal uplift in the core of the higher Himalayan crystallines (HHC), southwest Zanskar, India. Proceedings of the Indian Academy of Sciences (Earth and Planetary Science), 106(3), 169-179.
10) Tsujimori, T. and Itaya, T. (1999) Blueschist-facies metamorphism during Paleozoic orogeny in southwestern Japan: Phengite K-Ar ages of blueschist-facies tectonic blocks in a serpentinite melange beneath early Paleozoic Oeyama ophiolite. The Island Arc, 8, 190-205.
11) Ekwueme, B. N., Itaya, T. and Yabe, H. (2000) K-Ar ages of some metamorphic rocks of Oban massif and their implications for the tectonothermal evolution of Southeastern Nigeria. Jour. Min. Pet. Econ. Geol., 95(2), 58-68.
12) Nishimura, Y., Hirota, Y., Shiozaki, D., Nakahara N. and Itaya, T. (2004) The Nagasaki metamorphic rocks and their geotectonics in Mogi area, Nagasaki Prefecture, Southwest Japan -Juxtaposition of the Suo belt with the Sanbagawa belt- Jour. Geol. Soc. Japan, 110(6), 372-383 (in Japanese).
13) Eliwa, H.A., Abu El-Enen, M.M., Khalaf, I. M., and Itaya, T. (2004) Metamorphic evolution of Sinai metapelites and gneisses: Constraints from petrology and K/Ar age dating. Egyptian Journal of Geology 48(1), 22-43.
14) Kunugiza, K., Gto, A., Itaya, T. and Yokoyama, K. (2004) Geological development of the Hida Gaien belt: Constraints from K-Ar ages of high P/T metamorphic rocks and U-Th-Pb EMP ages of granitic rocks affecting contact metamorphism of serpentinite. Jour. Geol. Soc. Japan, 110(10), 580-590 (in Japanese).
15) Kim, S.W., Oh, C.W., Choi, S.G., Ryu, I.C. and Itaya, T. (2005); Ridge subduction-related Jurassic plutonism in and around the Okcheon metamorphic belt, South Korea and implications for northeast Asian tectonics. International Geology Review, 47, 248-269.
16) Tsujimori, T., Liou, J. G., Ernst, W. G. and Itaya, T. (2006) Triassic Paragonite- and Garnet-bearing Epidote-amphibolite from the Hida Mountains, Japan. Gondwana Res., 9, 167-175.
17) Aoki, K., Itaya, T., Shibuya, T., Masago, H., Kon, Y., Terabayashi, M., Kaneko, Y., Kawai, T. and Maruyama, S. (2008) The youngest blueschist belt in SW Japan: Implication for the exhumation of the Cretaceous Sanbagawa high-P/T metamorphic belt. Journal of Metamorphic Geology, 26, 583-602.
18) Eliwa, H.A., AbuEl-Enen, M.M., Khalaf, I.M., Itaya, T. and Murata, M. (2008) Metamorphic evolution of Neoproterozoic metapelites and gneisses in the Sinai, Egypt: Insights from petrology, mineral chemistry and K–Ar age dating. Journal of African Earth Sciences, 51, 107-122.
19) Nuong, N.D., Itaya, T., Hyodo, H. and Yokoyama, K. (2009) K-Ar and 40Ar/39Ar phengite ages of Sanbagawa schist clasts from the Kuma Group, central Shikoku, SW Japan. Island Arc, 18, 282-292. doi:10.1111/j.1440-1738.2008.00621.x
20) Thanh, N.G., Itaya, T., Sajeev, K., Ahmad, T., Kojima, S., Ohtani, T. and Ehiro, M. (2009) K-Ar ages of biotite and muscovite from Pangong metamorphic complex, Shyok suture zone, India: Implications for the youngest post-collision metamorphic event in Ladakh Himalaya. J. Min. Pet. Sci., 104 (3), 188-191. doi:10.2465/jmps.081021a
21) Takeshita, T., Yagi, K., Gouzu, C., Hyodo, H. and Itaya, T. (2015) Extensive normal faulting during exhumation revealed by the spatial variation of phengite K-Ar ages in the Sambagawa metamorphic rocks, central Shikoku, SW Japan. Island Arc. 24, 245-262.
22) Lu, Z., Shimizu, I. and Itaya, T. (2022) Metamorphic Ages of the Jurassic Accretionary Complexes in the Kanto Mountains, Central Japan, Determined by K–Ar Dating of Illite: Implications for the Tectonic Relationship between the Chichibu and Sanbagawa Belts. Minerals, 12, 1515. https://doi.org/10.3390/ min12121515.
6 Excess argon and its wave (EAW)
The presence of discordant and anomalously old K-Ar (40Ar/39Ar) phengitic white mica ages in metamorphic rocks has been widely reported in collisional orogenic belts. Biotite also has a significantly old “discordant” 40Ar/39Ar ages, older than the age of the hosting lithology, in a narrow zone of a contact aureole, calling this phenomenon “argon wave (Argonami)”. This type of excess 40Ar was incorporated into biotite by diffusion. Later researchers named the same phenomenon as “Excess-Argon Wave (EAW)”. The phenomenon of the trapping of EAW by minerals has been observed in kyanite, white mica and K-feldspar too. However, its behavior is still vague why and how the EAW could be generated during exhumation and cooling of the metamorphic sequences. These researches are in progress.
1) Itaya, T., Hyodo, H., Uruno, K. and Mikoshiba, M-U. (2005) Ultra-high excess argon in kyanites: Implications for ultra-high pressure metamorphism in Northern Japan. Gondwana Res., 8(4), 617-621.
2) Gouzu, C., Itaya, T., Hyodo, H. and Ahmad, T. (2006) Cretaceous isochron ages from K-Ar and 40Ar/39Ar dating of eclogitic rocks in the Tso Morari Complex, western Himalaya, India. Gondwana Res., 9(4), 426-440.
3) Itaya, T., Hyodo, H., Tsujimori, T., Wallis, S., Aoya, M., Kawakami, T. and Gouzu, C. (2009) Regional-Scale Excess Ar wave in a Barrovian type metamorphic belt, eastern Tibetan Plateau. Island Arc, 18, 293-305. doi:10.1111/j.1440-1738.2009.00668.x
4) Itaya, T. and Tsujimori, T. (2015) White mica K-Ar geochronology of the Sanbagawa eclogites in SW Japan: Implications on deformation-controlled K-Ar closure temperature. International Geology Review, 57, Nos. 5-8, 1014-1022. DOI:10.1080/00206814.2014.973915.
5) Itaya, T., Yagi, K., Gouzu, C., Thanh, N. X. and Groppo, C. (2017) Preliminary report on the excess argon bearing K-feldspar from metagranite in the Brossasco-Isasca UHP Unit of Dora-Maira Massif, Italy. Journal of Mineralogical and Petrological Sciences, 112, 36-39.
6) Itaya, T., Hyodo, H., Imayama, T. and Groppo, C. (2018) Laser step-heating 40Ar/39Ar analyses of biotites from meta-granites in the UHP Brossasco-Isasca Unit of Dora-Maira Massif, Italy. Journal of Mineralogical and Petrological Sciences, 113, 171-180. doi:10.2465/jmps.171201
7 K-Ar (40Ar/39Ar) dating of igneous rocks and the related low P/T metamorphic rocks
The rapid and highly sensitive K-Ar analyses and the laser-heating 40Ar/39Ar analyses was applied to the dating of igneous rocks and the related low P/T metamorphic rocks in Japan, Himalaya, Nigeria, Egypt and Slovenia.
1) Imaoka, T. and Itaya, T. (1989) Geology and K-Ar ages of the Imamisaki basalt, western San-in district, Japan. Jour. Geol. Soc. Japan, 95(10), 785-788 (in Japanese).
2) Goto, Y., Gouchi, N. and Itaya, T. (1991) Finding of 192Ma granitic cobbles from the cape Shiretoko area, eastern Hokkaido, Japan. Jour. Min. Pet. Econ. Geol., 86(9), 381-388.
3) Imaoka, T., Nakajima, T. and Itaya, T. (1993) K-Ar ages of hornblendes in andesite and dacite from the Cretaceous Kanmon Group, Southwest Japan. J. Min. Petr. Econ. Geol., 88(5), 265-271.
4) Ekwueme, B.N., Itaya, T. and Yabe, H. (1997) K-Ar ages of intrusive rocks in the Oban-Obudu massif and their significance for the tectonic and plutonic history of Southeastern Nigeria. The Island Arc, 6, 353-360.
5) Ozawa, H., Murata, M. and Itaya, T. (1997) Early Jurassic volcanism of the Mikabu belt: evidence from K-Ar age of picritic basalt, Kurouchi ultramafic mass, Kanto Mountains, Japan. Jour. Geol. Soc. Japan, 103(11), 1089-1092.
6) Eliwa, H.A., Dawoud, M., Khalaf, I.M., Negendank, G.F.W. and Itaya, T. (2003) Mineral inclusions in zircons from anorthosites, north eastern desert, Egypt. Egyptian Journal of Geology, 47(2), 1233-1262.
7) Imaoka, T. and Itaya, T. (2004); K-Ar geochronology of a Middle Miocene submarine volcano-plutonic complex in SW Japan. Geological Magazine, 141, 1-13.
8) Kawakami, G., Arita, K., Okada, T. and Itaya, T. (2004) Early exhumation of the collisional orogen and concurrent infill of foredeep basins in the Miocene Eurasian - Okhotsk plate boundary, central Hokkaido, Japan: Inferences from K-Ar dating of granitoid clasts. Island Arc, 13, 359-369.
9) Trajanova, M., Pecskay Z. and Itaya, T. (2008) K-Ar geochronology and petrography of the Miocene Pohorje Mountains batholith (Slovenia). Geologica Carpathica, 59(3), 247-260.
10) Thanh, N.X., Itaya, T., Ahmad, T., Kojima, S., Ohtani, T. and Ehiro, M. (2010) Mineral chemistry and K–Ar ages of plutons across the Karakoram fault in the Shyok-Nubra confluence of northern Ladakh Himalaya, India. Gondwana Research, 17, 180-188. doi:10.1016/j.gr.2009.08.002
11) Imaoka, T., Kiminami, K., Nishida, K., Takemoto, M., Ikawa, T., Itaya, T., Kagami, H. and Iizumi, S. (2011) K-Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene-Oligocene thermo-tectonic reactivation. Journal of Asian Earth Sciences, 40, 509-533.
12) Imayama, T., Takeshita, T., Yi, K., Cho, D.L., Kitajima, K., Tsutsumi, Y., Kayama, M., Nishido, H., Okumura.T., Yagi, K., Itaya, T. and Sano, Y. (2012) Two-stage partial melting and the different cooling history within the Higher Himalayan Crystalline Sequence in the far-eastern Nepal Himalaya. Lithos, 134-135, 1-22.
13) Imaoka, T., Nakashima, K., Kamei, A., Itaya, T., Ohira, T., Nagashima, M., Kono, N. and Kiji, M. (2014) Episodic magmatism at 105 Ma in the Kinki district, SW Japan: Petrogenesis of Nb-rich lamprophyres and adakites, and geodynamic implications. Lithos, 184-187, 105-131.
14) Imaoka, T., Nakashima, K., Kamei, A., Nagamatsu, Y., Ogita, Y., Ikawa, T., Itaya, T. and Kagami, H. (2014) Anatomy of the Cretaceous Hobenzan pluton, SW Japan: internal structure of a “frozen” magma chamber. Lithos, 208-209, 81-103.
15) Imaoka, T., Kawabata, H., Nagashima, M., Nakashima, K., Kamei, A., Kiminami, K., Yagi, K., Itaya, T. and Kiji, M. (2017) Petrogenesis of an Early Cretaceous lamprophyre dike from Kyoto Prefecture, Japan: implications for the generation of high-Nb basalt magmas in subduction zones. Lithos, 290-291, 18-33.
8 Fault gouge dating
A fault gouge formation age estimation method was established based on K-Ar dating of mica clay minerals formed by fault activity. The fault gouge dealt with is from the Akaishi tectonic line and other major tectonic lines in Japan, Korea and Vietnam. This method is used for the fault dating as well as for the study of epicenter materials.
1) Tanaka, H., Uehara, N. and Itaya, T. (1995) Timing of the cataclastic deformation along the Akaishi tectonic line, central Japan. Contr. Mineral. Petrol., 120, 150-158.
2) Cho, KH., Takagi, H., Iwamura, A., Awaji, D., Chang, TW., Shon, SW., Itaya, T. and Okada, T. (2001) Timing of the hydrothermal alteration associated with the fault activities along the Ulsan fault zone, southeast Korea. Econ. Environ. Geol., 34(6), 583-593.
3) Takagi, H., A. Iwamura, D. Awaji, T. Itaya, and T. Okada, 2005, Dating of fault gouges from the major active faults in southwest Japan: Constraints from integrated K-Ar and XRD analyses, in R. Sorkhabi and Y. Tsuji, eds., Faults, fluid flow, and petroleum traps: AAPG Memoir 85, p. 287– 301, doi:10.1306/1033729M853139
4) Song, Y., Chung, D., Choi, S-J., Kang, I-M., Park, C., Itaya, T. and Yi, K. (2014) K-Ar illite dating to constrain multiple events in shallow crustal rocks: Implications for the Late Phanerozoic evolution of NE Asia. Journal of Asian Earth Sciences, 95, 313-322. doi.org/10.1016/j.jseaes.2014.05.018
5) Hoang Bac Bui, Xuan Thanh Ngo, Yungoo Song, Tetsumaru Itaya, Koshi Yagi, The Hung Khuong, Jan Golonka, Tien Dung Nguyen (2016) K-Ar dating of fault gouges from the Red River Fault Zone of Vietnam. Acta Geologica Sinica, 90(5), 1653-1663.
6) Hoang Bac Bui, Xuan Thanh Ngo, The Hung Khuong, Jan Golonka, Tien Dung Nguyen, Yungoo Song, Tetsumaru Itaya, Koshi Yagi (2017) Episodes of brittle deformation within the Dien Bien Phu Fault zone, Vietnam: Evidence from K-Ar age dating of authigenic illite. Tectonophysics, 695, 53-63.
7) Kubota, Y., Takeshita, T., Yagi, K., and Itaya, T. (2020) Kinematic analyses and radiometric dating of the large‐scale paleogene two‐phase faulting along the median tectonic line, Southwest Japan. Tectonics, 39, e2018TC005372. https://doi.org/10.1029/2018TC005372, 1-29.
9 Contribution to Tectono-metamorphic evolution of the metamorphic belts
1) Nam, T.N., Toriumi, M. and Itaya, T. (1998) P-T-t paths and postmetamorphic exhumation of the Day Nui Con Voi shear zone in Vietnam. Tectonophysics, 290, 299-318.
2) Nam, T.N., Hyodo, H., Itaya, T. and Matasuda, T. (2000) Early Proterozoic tectonothermal event south of the red river shear zone in Vietnam: First evidence from 40Ar/39Ar dating of single grain hornblende. Viet. Nat. Univ. J. Sci. Nat. Sci., 16, 26-34.
3) Nam, T.N., Hyodo, H., Itaya, T. and Matsuda, T. (2002) 40Ar/39Ar single grain dating and mineral chemistry of hornblendes south of the Red River shear zone (Vietnam): New evidence for Early Proterozoic tectonothermal event. Gondwana Research, 5(4), 801-812.
4) Oh, C.W., Kim, S.W., Ryu, I-C., Okada, T., Hyodo, H. and Itaya, T. (2004) Tectono-metamorphic evolution of the Okcheon Metamorphic Belt, South Korea: Tectonic implications in East Asia. Island Arc, 13, 387-402. Island Arc Award 2008
5) Kim, S.W., Oh, C.W., Hyodo, H., Itaya, T. and Liou, J.G. (2005) Metamorphic evolution of the Southwest Okcheon metamorphic belt in South Korea and its regional tectonic implications. International Geology Review, 47, 344-370.
6) Thanh, N.X., Tu, M. T., Itaya, T. and Kwon, K. (2011) Chromian-spinel compositions from the Bo Xinh ultramafics, Northern Vietnam: Implications on tectonic evolution of the Indochina block. Journal of Asian Earth Sciences, 42, 258-267. doi:10.1016/j.jseaes.2011.02.004
7) Fukui, S., Tsujimori, T., Watanabe, T. and Itaya, T. (2012) Tectono-metamorphic evolution of high-P/T and low-P/T metamorphic rocks in the Tia Complex, southern New England Fold Belt, eastern Australia: Insights from K-Ar chronology. Journal of Asian Earth Sciences, 59, 62-69.
8) Thanh, N. X., Rajesh, V. J., Itaya, T., Windley, B. F., Kwon, S. and Park, C. (2012) A Cretaceous forearc ophiolite in the Shyok suture zone, Ladakh, NW India: Implications for the tectonic evolution of the Northwest Himalaya. Lithos, 155, 81-93.
9) Thanh, N. X., Hai, T. T., Hoang, N., Lan, V. Q., Kwon, S. and Itaya, T. (2014) Backarc mafic-ultramafic magmatism in Northeastern Vietnam and its regional tectonic significance. Journal of Asian Earth Sciences, 90, 45-60.
10 Collaboration with UHT metamorphic petrologists including Precambrian researchers
1) Eliwa, H.A., Kimura, J.-I. and Itaya, T. (2006) Late Neoproterozoic DokhanVolcanics, North Eastern Desert, Egypt: Geochemistry and petrogenesis. Precambrian Research, 151, 31-52. doi:10.1016/j.precamres.2006.08.005.
2) Dawoud, M., Eliwa, H.A., Traversa, G., Attia, M.S. and Itaya, T. (2006) Geochemistry, mineral chemistry and petrogenesis of a Neoproterozoic dyke swarm in the north Eastern desert, Egypt. Geol. Mag., doi:10.1017/S0016756805001196, 1-21.
3) Sajeev, K., Osanai, Y. Kon, Y. and Itaya, T. (2009) Stability of pargasite during ultrahigh-temperature metamorphism: A consequence of titanium and REE partitioning?
American Mineralogist, 94, 535-545. DOI: 10.2138/am.2009.2815
4) Santosh, M., Sajeev, K., Li, J.H., Liu, S.J. and Itaya, T. (2009) Counterclockwise exhumation of a hot orogen: The Paleoproterozoic ultrahigh-temperature granulites in the North China Craton. Lithos, 110, 140-152. doi: 10.1016/j.lithos.2008.12.010
5) Sajeev, K., Jeong, JH., Kwon, S., Kee, WS., Kim, SW., Komiya, T., Itaya, T., Jung, HS and Park, Y. (2010) High P-T granulite relicts from the Imjingang belt, South Korea:tectonic significance. Gondwana Res., 17(1), 75-86. doi:10.1016/j.gr.2009.07.001
6) Eliwa H.A., Breitkreuz C., Murata M., Khalaf I.M., Bühler B., Itaya T., Takahashi T., Hirahara Y., Miyazaki T., Kimura J-I., Shibata T., Koshi Y., Kato Y., Ozawa H., Daas M.A., El Gameel Kh. (2013) SIMS zircon U–Pb and mica K–Ar geochronology, and Sr–Nd isotope geochemistry of Neoproterozoic granitoids and their bearing on the evolution of the north Eastern Desert, Egypt.
Gondwana Research, 25, 1570-1598. http://dx.doi.org/10.1016/j.gr.2013.06.006
7) Ishwar-Kumar, C., Windley, B. F., Horie, K., Kato, T., Hokada, T., Itaya, T., Yagi, K., Gouzu, C. and Sajeev, K. (2013) A Rodinian suture in western India: New insights on India-Madagascar correlations. Precambrian Research, 236, 227-251.
8) George, P.M., Santosh, M., Chen, N., Nandakumar, V., Itaya, T., Sonali, M.K., Smruti, R.P. and Sajeev, K. (2015) Cryogenian magmatism and crustal reworking in the Southern Granulite Terrane, India. International Geology Review, 57, 112-133.
9) Samuel, V.O., Sajeev, K., Hokada, T., Horie, K. and Itaya, T. (2015) Neoarchean arc magmatism followed by high-temperature, high-pressure metamorphism in the Nilgiri Block, southern India. Tectonophisics, 662, 109-124.
10) Ishwar-Kumar, C., Sajeev, K., Windley, B.F., Kusky, T.M, Feng, P., Ratheesh-Kumar, R.T., Huang, Y., Zhang, Y., Jiang, X, Razakamanana, T., Yagi, K. and Itaya, T. (2015) Evolution of high-pressure mafic granulites and pelitic gneisses from the Betsimisaraka suture, NE Madagascar: Tectonic implications. Tectonophysics, 662，219-242.
11) Ishwar-Kumar, C., Rajesh, V.J., C., Windley, B.F., Razakamanana, T., Itaya, T., Babu, E.V.S.S.K. and Sajeev, K. (2018) Chromite chemistry as an indicator of petrogenesis and tectonic setting of the Ranomena ultramafic complex in north-eastern Madagascar. Geological Magazine, 155 (1), 109-118. doi:10.1017/S0016756816000972.
11 Chronological review of metamorphic belts
1) Isozaki, Y. and Itaya, T. (1990) Chronology of Sanbagawa metamorphism.
J. Metamorphic Geol., 8, 401-411.
2) Takeshita, H. and Itaya, T. (1993) Radiometric ages of Alpine metamorphic rocks in the western and central Alps. The Island Arc, 2, 193-212.
3) Itaya, T., Tsujimori, T. and Liou, J. G. (2011) Evolution of the Sanbagawa and Shimanto high-pressure belts in SW Japan: Insights from K-Ar(Ar-Ar) geochronology. Journal of Asian Earth Sciences, 42, 1075-1090. doi:10.1016/j.jseaes.2011.06.012
12 Others
1) Banno, S., Higashino, T., Otsuki, M., Itaya, T. and Nakajima, T. (1978) Thermal structure of the Sanbagawa metamophic belt in central Shikoku. J. Phys. Earth., 26, Supple., S345-S356.
2) Itaya, T. (1978) Reverse-zoned garnet in Sanbagawa pelitic schists in central Shikoku, Japan: in notes on petrography and rock-forming mineralogy (5). Jour. Min. Pet. Econ. Geol., 73(12), 393-396.
3) Itaya, T. (1978) Albite porphyroblasts containing retrograde TiO2 minerals from Sanbagawa pelitic schists in central Shikoku, Japan: in notes on petrography and rock-forming mineralogy (3). Jour. Min. Pet. Econ. Geol., 73(11), 339-345.
4) Okada, T., Itaya, T., Sato, M. and Nagao, K. (1994) Noble gas isotopic composition of deep underground water in Osaka plain, central Japan: evidence of mantle He and model for new volcanism. The Island Arc, 3, 221-231.
5) Mikouchi, T., Tsuchiyama, A., Akai, J., Nakashima, S., Tazaki, K., Itaya, T. and Yanai, K. (1997); Mineralogical consideration on possible microfossils in martian meteorite ALH84001. Mineralogical Journal, 19(2), 47-64.
6) Kim, S.W., Itaya, T., Hyodo, H. and Matsuda, T. (2002) Metamorphic K-feldspar in low-grade meta-sediments from the Ogcheon metamorphic belt in South Korea. Gondwana Research, 5(4), 849-856.
7) Maeda, J., Zeniya, R., Kuramoto, Y., Itaya, T. and Kagami, H. (2011) A procedure for calculating a consistent set of closure temperatures and cooling rate using Dodson’s formula. Journal of Geological Society of Japan, 117 (2), 99-103.
8) Sonehara, T., Yagi, K., Takeshita, H., Aoki, K., Aoki, S., Otofuji, Y. and Itaya, T. (2020)
Kibi Plateau: A stable-coherent tectonic unit in the active Japanese Islands. Scientific Reports, (2020) 10:3786 | https://doi.org/10.1038/s41598-020-60448-x, 1-13.
9) Takeshima, Y., Hyodo, H., Tsujimori, T., Gouzu, C. and Itaya, T. (2022) In Situ Argon Isotope Analyses of Chondrule-Forming Materials in the Allende Meteorite: A Preliminary Study for 40Ar/39Ar Dating Based on Cosmogenic 39Ar. Minerals, 13, 31. https://doi.org/10.3390/min13010031.
10) Sato, M., Hyodo, H., Sugiura, K., Tsujimori, T. and Itaya, T. (2024) Regional-Scale Paleoproterozoic Heating Event on Archean Acasta Gneisses in Slave Province, Canada: Insights from K–Ar and 40Ar/39Ar Chronology. Minerals, 14, 397. https://doi.org/10.3390/min14040397.