ÿþ<html><head><title> Hide KUMAGAI's web </title></head><center><table border="5" cellpadding="2" cellspacing="5"><tbody><tr align="center"><td><h2>Hidenori KUMAGAI, Dr.</H2><h3>Senior Research Scientist<br>Institute for Research on Earth Evolution(IFREE)<br> Precambrian Ecosystem Laboratory<br>and Seafloor Resource Research Project</td></tr></tbody></table><br><hr size="3" width="100%">Japanese version is <a href="index.html">HERE</a><hr size="3" width="100%"></center> <h5 align="right">Last updated: Apr.20, 2012</h5><center><h2></h2></center><hr size="2"> <h3>Research Interest</h3><ul><li>Global geochemical structure of Mantle and hydrothermal activity<li>Noble gas geochemistry on abyssal peridotites<li>Noble gas geochemistry in ocean spreading centers<li>Application of radiometric dating (especially K-Ar method)</ul><hr> <h3>Publications</h3>Reviewed articles:<ul> <li>Takanori Kagoshima, Naoto Takahata, Jinyoung Jung, Hiroshi Amakawa, Hidenori Kumagai and Yuji Sano (2012)<br> Estimation of sulfur, fluorine, chlorine and bromine fluxes at Mid Ocean Ridges using a new experimental crushing and extraction method, Geochemical J., accepted. <li>Takeshi Tsuji, Ken Takai, Hisashi Oiwane, Yasuyuki Nakamura, Yuka Masaki, Hidenori Kumagai, Masataka Kinoshita, Fujio Yamamoto, Tadashi Okano, Shin'ichi Kuramoto(2012)<br> Hydrothermal fluid flow system around the Iheya North Knoll in the mid-Okinawa trough based on seismic reflection data, J. Volcanol. Geotherm. Res., 213-214, 41-50. <li>Keiko Sato, Hidenori Kumagai and Hironobu Hyodo (2011)<br> What criteria should be used for Ar-Ar dating in multi-chronology? Fission Trach News Letter, 24, 1-8 (in Japanese w/ English abstr.). <li>Tomoaki Morishita, Kenichiro Tani, Hiroshi Shukuno, Yumiko Harigane, Akihiro Tamura, Hidenori Kumagai and Eric Hellebrand (2011)<br> Diversity of melt conduits in the Izu-Bonin-Mariana forearc mantle: Implcations for the earliest stage of arc magmatism, Geology. 39(4), 411-414. <li>Hidenori Kumagai, Satoshi Tsukioka, Hiroyuki Yamamoto, Takeshi Tsuji, Kiminori Shitashima, Miho Asada, Fujio Yamamoto, Masataka Kinoshita (2010)<br> Data Brief: Hydrothermal plumes imaged by high-resolution side-scan sonar on a cruising AUV, Urashima, Geochem. Geophys. Geosyst., 11, 12, Q12013- 2010. <li>Keiko Sato, Hidenori Kumagai, Takehiro Hirose, Hajimu Tamura, Kazuo Mizoguchi, Toshihiko Shimamoto (2009)<br> Experimental study for noble gas release and exchange under high-speed frictional melting, Chemical Geology, 266, 1-2, 96-103. <li>T Sato, K Okino and H Kumagai (2009)<br> Magnetic structure of an oceanic core complex at the southernmost Central Indian Ridge: Analysis of shipboard and deep-sea three-component magnetometer data, Geochem. Geophys. Geosyst., 10, Q06003, doi:10.1029/2008GC002267. <li>K Nakamura, T Morishita, W Bach, F. Klein, K. Hara, K Okino, K Takai and H Kumagai (2009)<br> Serpentinized troctolites exposed near the Kairei Hydrothermal Field, Central Indian Ridge: Insights into the origin of the Kairei hydrothermal fluid supporting a unique microbial ecosystem, Earth Planet. Sci. Lett., 280(1-4), 128-136. <li>H Kumagai, K Nakamura, T Toki, T Morishita, K Okino, J-i Ishibashi, U Tsunogai, S Kawagucci, T Gamo, T Shibuya, T Sawaguchi, N Neo, M Joshima, T Sato and K Takai (2008)<br> Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge: Implications of their vent fluids' distinct chemistry, Geofluids, 8(4), 239-251. <li>K Sato, H Kumagai, H Tamura and H Kawabata (2008)<br> Development of un-irradiated and un-spiked laser fusion K-Ar dating, Chikyukagaku(Geochemistry), 42(4), 179-199 (in Japanese with English abstract). <li>Morishita, M., Maeda, J., Miyashita, S., Kumagai, H., Matsumoto, T. and Dick, H.J.B. (2007)<br> Petrology of local concentration of chromian spinel in dunite from the slow-spreading Southwest Indian Ridge, Eur. J. Mineral., 19(6), 871-882. <li>Geshi, N., Umino, S., Kumagai, H., Sinton, J. M., White, S. M., Kisimoto, K. and Hilde, T. W. (2007)<br> Discrete plumbing systems and heterogeneous magma sources of a 24 km3 off-axis lava field on the western flank of East Pacific Rise, 14[deg]S, Earth Planet. Sci. Lett., 258(1-2), 61-72. <li>Nakamura, K., Morishita, T., Chang, Q., Neo, N., and Kumagai, H. (2007)<br> Discovery of lanthanide tetrad effect in an oceanic plagiogranite from an Ocean Core Complex at the Central Indian Ridge 25[deg]S systems, Geochem. J., 41, 135-140. <li>Takai, K., Nakamura, K., Suzuki, K., Inagaki, F., Nealson, K. H. and Kumagai, H. (2006)<br> Ultramafics-Hydrothermalism-Hydrogenesis-HyperSLiME (UltraH3) linkage: a key insight into early microbial ecosystem in the Archean deep-sea hydrothermal systems, Paleontol. Res., 10(4), 269-282. <li>White, S. M., Umino S. and Kumagai, H. (2006)<br> Transition from Seamount Chain to Intra-plate Volcanic Ridge at the East Pacific Rise, Geology, 34(4), 293 296. <li>Kumagai, H. and Kaneoka, I. (2005)<br> Noble gas signatures around the Rodriguez Triple Junction in the Indian Ocean - Constraints on magma genesis in a ridge system, Geochim. Cosmochim. Acta, 69, 5567-5583. <li>Sumino, H., Yamamoto, J. and Kumagai, H. (2005)<br> Noble gas studies of mantle-derived xenoliths: mantle metasomatism revealed by noble gas isotopes - a review, Japanese Magazine of Mineralogical and Petrological Sciences, 34, 173-185. <li>Kumagai,H. Dick,H.J.B. and Kaneoka,I.(2003),<br>Noble gas signatures of abyssal gabbros and peridotites at an Indian Ocean core complex, G-cubed, 4, paper # 9107, doi:10.1029/2003GC000540. <li>Matsumoto,T., Miyashita,S., Arai,S., Morishita,T., Maeda,J-i., Kumagai,H., Ohtomo,Y. and Dick,H.J.B.(2003)<br>Magmatism and "Crust-mantle boundary" on the ultra-slow spreading ridge as observed in Atlantis Bank, Southwest Indian ridge (in Japanese with English abstr.), J. Geogr., 112(5), 705-719. <li>Kumagai,H. and Kaneoka,I.(2003),<br>Relationship between submarine MORB glass textures and atmospheric component of MORBs, Chem. Geol., 200, 1-24. <li>Kumagai,H. and Kaneoka,I.(1998),<br>Variations of noble gas abundances and isotope ratios in a single MORB pillow,Geophys. Res. Lett., 25, 3891-3894. <li>Kumagai,H., Kaneoka,I. and Ishii,T.(1996),<br>The active period of the Ayu Trough estimated from K-Ar ages: the southeastern spreading center of Philippine Sea Plate,Geochem. J., 30, 81-87.</ul> Non-reviewed articles: <ul> <li>Hidenori Kumagai, Ryoichi Iwase, Masataka Kinoshita, Hideaki Machiyama, Mutsuo Hattori, and Masaharu Okano (2012)<br> Environmental gamma-ray observation in deep sea, In "Gamma Radiation"(ISBN 978-953-51-0316-5, ed. Feriz Adrovic), pp. 55-74, InTECH, Rijeka, Croatia.<br> <a href="http://cdn.intechopen.com/pdfs/32837/InTech-Environmental_gamma_ray_observation_in_deep_sea.pdf">pdf is here</a> <li>Kumagai,H. and Kaneoka, I.(2005), Evaluation of radiometric ages of the Japan Sea basement obtained by ODP drilling, in Symposium report "Toward the ultra-deep drilling in Japan Sea" (eds. S. Miyashita, N. Fujibayashi and N. Abe), pp 32-36 (in Japanese). <li>Tsuchida,S., Kumagai,H., Ishibashi,J., Watanabe,H. and Kouzuma,F. (2001),Preliminary report of hydrothermalism and volcanism at the Kaikata Seamount,JAMSTEC journal of Deep Sea Research, 18, 209 - 215 (in Japanese with English abstract). <li>Kaneoka,I., Hanyu,T. and Kumagai,H.(1997),Noble gas isotopes and characteristics of magma sources- Present status and problems,Bulletin of the volcanological society of Japan, Special number "Magmalogy",42, S313-S319 (in Japanese with English abstract). <li>Kumagai,H. and Kaneoka,I.(1996),On the contamination effect to magmatic noble gases at magma solidification,Abstracts, Todai Internatl.Symp.Geochronol.Cosmochrnol.Isotope Geosci., 123-125.</ul> Invited Talk: <ul> <li>Kumagai, H. Okino, K. et al. (2006),<br> A field-work approach to investigate UltraH<sup>3</sup>-linkage hypothesis at two distinct hydrothermal fields, Indian Ocean, 2006 Western Pacific Geophysics Meeting, July 2006, Beijing, China.</ul> <hr> <h3>Carrier Background/ History</h3> <dl> <dt>2012/ 4 - </dt> <dd>Senior Research Scientist, IFREE, JAMSTEC</dd> <dt>2004/ 7 - 2012/ 3</dt> <dd>Research Scientist, IFREE, JAMSTEC</dd> <dt>2000/ 4 - 2004/ 6</dt><dd>Research Scientist, Deep Sea Res. Dept., JAMSTEC</dd><dt>2002/10 - 2003/10<dd>Guest Investigator, Dept. Geology and Geophysics, Woods Hole Oceanographic Inst., MA, USA<dt>1999/ 4 - 2000/ 3<dd>Teaching and research staff, Faculty of Geo-Environmental Science, Rissho University (part time)<dd>Teaching staff on Earth Sciences, Oin High School (part time)<dd>Research student, Earthquake research Inst., University of Tokyo<dt>1997/ 4 - 1999/ 3<dd>JSPS Research Fellow (DC2) </dl> <h3>Classes</h3> <dl><dt>2010/ 4 - </dt><dd> Basic geoscience A, B as liberal arts, Toyo Univ.</dd> <dt>2010/ 9- 2011/ 2</dt><dd> Earth and Planetary Sciences 202 as liberal arts, Senshu Univ.</dd></dl> <h3>Education</h3><dl><dt>1995/ 4 - 1999/ 3<dd>Graduate school of Science, University of Tokyo (worked in Earthquake research Inst., University of Tokyo)<dd>Awarded the degree of Ph.D. in Earth and Planetary Physics <dd>for a thesis entitled "Variation of noble gas signatures controlled by tectonic conditions and magmatic processes: a case study for an area around the Rodriguez Triple Junction in the Indian Ocean."<dd>Work supervised by Professor Ichiro Kaneoka<dt>1993/ 4 - 1995/ 3<dd>Graduate school of Science, University of Tokyo (worked in Earthquake research Inst., University of Tokyo)<dd>Awarded the degree of MSc in Earth and Planetary Physics<dd>Work supervised by Professor Ichiro Kaneoka<dt>1991/ 4 - 1993/ 3<dd>Faculty of Science, University of Tokyo<br><dd>Awarded the degree of BSc in Geophysics</dl><hr size="3"><a href="http://www.jamstec.go.jp/seika/pub-j/res/deptd-e/110000.html">List of research staff</a><br><a href="http://www.jamstec.go.jp/jamstec-e/shinkai/STAFF/index.html">Deep Sea Res. Dept.</a><br><hr size="5">Your <a href="mailto:kumagai (at) jamstec.go.jp">comment</a>should be welcome!<br>To send <a href="mailto:kumagai (at) jamstec.go.jp"><i>e-mail</i> </a><p></p></body></html>