Last Update 04/24 2012
Research: The following works are in progress; 1) Petrogenesis of Cenozoic alkaline basalts in extra back-arc province, southern Patagonia. 2) Magmatism of continental arc related to active ridge subduction in southern Chile. 3) Constraint for interaction process of mantle plume and lithospheric mantle: A example of Afar-Arabian rift system. 4) Geochemical and geochronological studies of minerals and melt inclusions by LA-ICP-MS technique. Publications: Orihashi, Y., Al-Jailani, A. and Nagao, K., Dispersion of the Afar plume : Implications from the spatiotemporal distribution of the Late Miocene to Recent volcanics, southwestern Arabian Peninsula, Gondwana Res., 1, 2, 221--234, 1998. Orihashi, Y., Maeda, J., Tanaka, R., Zeniya, R. and Niida, K., Sr and Nd isotopic data for the seven GSJ rock reference samples; JA-1, JB-1a, JB-2, JG-1a, JGb-1 and JR-1, Geochem. J., 32, 4, 205--211, 1998. Takagi, T., Orihashi, Y., Naito K. and Watanabe, Y., Petrology of a mantle-derived rhyolite, Hokkaido, Japan, Chem. Geology, 160, 425--445, 1999. Agashev, A. M, Orihashi, Y., Watanabe, T., Pokhilenko, N. P. and Serenko, Y. P., Isotope-geochemical features of the Siberian-Platform kimberlite in connection with the problem of their origin, Geologiya Geofizika, 41, 1, 90--99, 2000. Orihashi, Y., Nagao, K., Al-Jailani, A. and Hanan, B. B., Primordial Helium isotope signature from Plio-Quaternary alkaline basalts in Yemen., The Island Arc, 10, 2, 145--157, 2001. 新正裕尚・折橋裕二・角井朝昭・中井俊一, 室生火砕流堆積物の全岩化学組成：その給源への手掛り, 岩石鉱物科学, 31, 307--317, 2002. 折橋裕二・原口 悟・石井輝秋・玉木賢策・S. Al-Khirbash, アデン湾，東経46°近傍のEタイプ中央海嶺玄武岩類の成因, 地学雑誌, 112, 5, 732--749, 2003. Orihashi, Y. and T. Hirata, Rapid quantitative analysis of Y and REE abundances in XRF glass bead for selected GSJ reference rock standards using Nd-YAG 266 nm UV laser ablation ICP-MS, Geochem. J., 37, 3, 401--412, 2003. Orihashi, Y., T. Hirata, K. Tani and H. Yoshida, Rapid and simultaneous determination of multi-element abundances and U-Pb age for zircon crystal using UV laser ablation ICP-MS technique: critical evaluation of the technique with 91500 zircon standard, Jour. Miner. Petrol. Sci., 98, 3, 109--117, 2003. Orihashi, Y., J.A. Naranjo, A. Motoki, H. Sumino, D. Hirata, R. Anma and K. Nagao, Quaternary volcanic activity of Hudson and Lautaro volcanoes, Chilean Patagonia: new constraints from K-Ar ages, Rev.Geol. Chile, 31, 2, 207--224, 2004. Honda, S., Y. Orihashi, K. Mibe, A. Motoki, H. Sumino and M.J. Haller, Mantle wedge deformation by subducting and rotating slab and its possible implication, Earth Planets Space, 58, 8, 1087--1092, 2006. Motoki, A., Y. Orihashi, J.A. Naranjo, D. Hirata, P. Skvarca and R. Anma, Geologic reconnaissance of Lautaro volcano, Chilean Patagonia, Rev. Geol. Chile, 33, 1, 177--188, 2006. Mibe, K., Y. Orihashi, S. Nakai and T. Fujii, Element partitioning between transition-zone minerals and ultramafic melt under hydrous conditions, Geophys. Res. Lett., 33, L16307, doi:10.1029/2006GL026999, , 2006. 折橋裕二・岩野英樹・平田岳史・檀原 徹・新正裕尚, 西南日本外帯，熊野酸性岩類に含まれる赤色・無色・灰濁色ジルコンのU-Pb年代および微量元素組成と珪長質マグマ成因, 地質学雑誌, 113, 7, 366--383, 2007. 新正裕尚・折橋裕二・和田穣隆・角井朝昭・中井俊一, 紀伊半島中新世珪長質火成岩類の全岩組成の広域的変化, 地質学雑誌, 113, 7, 308--323, 2007. Orihashi, Y., S. Nakai and T. Hirata, U-Pb age determinations for seven standard zircons by ICP-Mass Spectrometry coupled with frequency quintupled Nd-YAG (λ= 213 nm) laser ablation system: Comparison with LA-ICP-MS zircon analyses with a NIST glass reference material, Resource Geol., 58, 2, 101--123, 2008. Matsumoto, T., Y. Orihashi, J. Matsuda and K. Yamamoto, Argon isotope ratio of the plume-source deduced from high-resolution stepwise crushing extraction, Geochem. J., 42, 39--49, 2008. Shibata, T., Y. Orihashi, G. Kimura and Y. Hashimoto, Underplating of mélange evidenced by the depositional ages: U-Pb dating of zircons from the Shimanto accretionary complex, SW Japan, Island Arc, 17, 3, 376--393, 2008. Shinjoe, H., Y. Orihashi and T. Sumii, U-Pb zircon ages of syenitic and granitic rocks in the Ashizuri igneous complex, southwestern Shikoku: Constraint for the origin of forearc alkaline magmatism, Geochem. J., 44, 4, 275--283, 2010. Kobayashi, C., Y. Orihashi, D. Hirata, J.A. Naranjo, M. Kobayashi and R. Anma, Compositional variations revealed by ASTER image analysis of the Viedma Volcano, southern Andes Volcanic Zone, Andean Geol., 37, 2, 433--441, 2010. 高地吉一・折橋裕二・小原北士・宮田和周・下條将徳・大藤 茂・青山正嗣・赤堀良光・柳井修, 九州西端部からの四万十高圧変成岩の発見, 地学雑誌, 120, 1, 30--39, 2011. Mori, Y., Y. Orihashi, T. Miyamoto, K. Shimada, K. Shigeno and T. Nishiyama, Origin of zircon in jadeitite from the Nishisonogi metamorphic rocks, Kyushu, Japan, J. Metam. Geol., doi:10.1111/j.1525-1314.2011.00935.x, , 2011. 岩野英樹・折橋裕二・檀原徹・平田岳史, 同一ジルコン結晶を用いたフィッション・トラックとU-Pbダブル年代測定法の評価−島根県川本花崗閃緑岩中の均質ジルコンを用いて−, 地質学雑誌, in press, , 2012. Orihashi, Y., R. Anma, A. Mootki, M.J. Haller, D. Hirata, H. Iwano, H. SUmino and V.A. Ramos, Geochronological fingerprint revealing the evolution of the crust underlying Cerro Pampa, Argentine Patagonia: Constraint from LA-ICPMS U-Pb ages for exotic zircons in the Mid-Miocene adakite, Geochem. J., submitted, , 2012. Anma, R. and Y. Orihashi, Education of melt at shallow levels due to subduction of the Chile Ridge: LA-ICPMS U-Pb ages of magmatic and detrital zircons, Geochem. J., submitted, , 2012. Shinjoe, H., Y. Orihashi, J.A. Naranjo, D. Hirata, T. Hasenaka, T. Fukuoka, T. Sano and R. Anma, Boron and other trace element composition of the Quaternary volcanic rocks of the Southern Volcanic Zone in Andean Arc: implication for the slab-derived fluid and mantle wedge components, Geochem. J., submitted, , 2012. 折橋裕二・稲垣賢一・平田岳史・安間了・平田大二, 西南日本外帯，中期中新世花こう岩類のジルコンのREE組成とマグマ成因ースラブ溶融の可能性についてー, 月刊地球／号外, 30, 14--21, 2000. 折橋裕二・元木昭寿・Miguel Haller・CHRISTMASSY研究プロジェクト・火山班, 超背弧地域に産する比較的大規模な玄武岩類の成因：パタゴニア地方, ソムンクラ台地を例に, 月刊地球, 27, 6, 438--447, 2005. |
