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Takaaki Fukuoka, Yasuhiro Ito, Mitsuhiro Nakagawa
Session ID: 2C01
Published: 2004
Released on J-STAGE: February 23, 2007
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Yutaka Takigami, Harutaka Sakai, Yuji Orihashi
Session ID: 2C02
Published: 2004
Released on J-STAGE: February 23, 2007
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There are old igneous rocks in the Siwalik, Nepal, and western region from Kolkata, India. 40Ar-39Ar ages of 1.5-1.7 Ga have been obtained for these rocks. We want to present these results and discuss the geochemical and heological meanings for these rocks.
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Koichiro Nagamine, Bruce Chappell, Milan Kohut
Session ID: 2C03
Published: 2004
Released on J-STAGE: February 23, 2007
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Tesfaye Kebede, Hiroshi Hidaka
Session ID: 2C04
Published: 2004
Released on J-STAGE: February 23, 2007
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The western Ethiopian Precambrian occupies a key part as it is located where a low-grade volcano-sedimentary belt of Arabian-Nubian shield (ANS) considerably narrows and wedges into a high-grade gneissic Mozambique Belt (MB). Recent geochemical and petrogenetic studies, as well as radiogenic dating of the granitoid plutons emplaced at the interface of the ANS and MB augmented our understanding of the evolution of the granitoid magmas. During the Neoproterozoic time the granitic magmatism changed from subduction-related calc-alkaline ® anatectic ® anorogenic types. Hence, we present a synoptic view of the petrogenetic processes responsible for the generation of these granitoids using major and trace element studies.
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Yoshitada Asakawa, Mituhiro Yasui, Tutomu Yuri, Iturou Kita, Masatugu ...
Session ID: 2C05
Published: 2004
Released on J-STAGE: February 23, 2007
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Susumu Nohda, Tomomi kani, Yo-ichiro Otofuji
Session ID: 2C06
Published: 2004
Released on J-STAGE: February 23, 2007
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The Japan Sea basin was formed at around 20-15 Ma through back-arc opening process accompaning megatectonic structural change of crust and mantle, and at present, is observed oceanic crust in the basin. We have obtained geochemical evidences to support compositional chemical change of the crust and mantle in the isotopic compositions of Pb, Nd, and Sr in the Tertiary volcanic rocks, NE Japan.
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Yasuyuki Furuya, Hirochika Sumino, Aya Shimizu, Keisuke Nagao, Kenji N ...
Session ID: 2C07
Published: 2004
Released on J-STAGE: February 23, 2007
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Monica HANDLER, Katsuhiko SUZUKI, Natsue ABE, Shoji ARAI
Session ID: 2C08
Published: 2004
Released on J-STAGE: February 23, 2007
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Peridotite xenoliths from Noyamadake represent ca. 7 Ma samples of relatively dry mantle wedge that equilibrated with a high geotherm. Re-Os isotopic systematics suggest presence of older continental lithosphere and help to constrain the composition and behaviour of Re and Os in the mantle wedge.
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Hirochika Sumino, Yuji Orihashi, Akihisa Motoki, Daiji Hirata, Miguel ...
Session ID: 2C09
Published: 2004
Released on J-STAGE: February 23, 2007
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Yasuharu Kudo, Takuya Matsumoto, Jun-ichi Matsuda, Yuji Orihashi
Session ID: 2C10
Published: 2004
Released on J-STAGE: February 23, 2007
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Takuya Matsumoto, Tomoaki Morishita, Jun-ichi Matsuda, Toshiyuki Fujio ...
Session ID: 2C11
Published: 2004
Released on J-STAGE: February 23, 2007
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Naoki Shirai, Mitsuru Ebihara
Session ID: 2D01
Published: 2004
Released on J-STAGE: February 23, 2007
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Gen Shimoda, Yukio Ikeda, Noriko Kita, Yuichi Morishita, Naoya Imae
Session ID: 2D02
Published: 2004
Released on J-STAGE: February 23, 2007
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The shergottite, nakhlite and chassignite (SNC) meteorites are widely accepted as being of martian origin, and have been studied extensively in relation to martian magmatism. However, the origin of martian magmatism remains unclear. The model proposed in this report demonstrates that two-stage melting of plumes from the deepest mantle reproduces the chemical and isotopic variations of martian magmas represented by the martian meteorites, and is suggestive of a preserved layered-mantle structure resulting from early differentiation processes. The model further suggests that the deepest mantle layer in Mars may represent a major water reservoir.
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HIROSHI HIDAKA, SHIGEKAZU YONEDA
Session ID: 2D03
Published: 2004
Released on J-STAGE: February 23, 2007
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Nobuo Takaoka
Session ID: 2D04
Published: 2004
Released on J-STAGE: February 23, 2007
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NORIKO EBISAWA, RYUJI OKAZAKI, KEISUKE NAGAO, KENJI NOTSU
Session ID: 2D05
Published: 2004
Released on J-STAGE: February 23, 2007
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Takahito OSASA, Keisuke NAGAO
Session ID: 2D06
Published: 2004
Released on J-STAGE: February 23, 2007
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We measured noble gases in carbonaceous CB, CH, and Tagish lake carbonaceous chondrites using stepwise heating technique. CB and CH chondrites are rare groups of cabonaceous chondrites, which are mainly recovered from desert. We presented here the details of noble gas signature of them.
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Marta Svetina, Tomoki Nakamura, Keisuke Nagao
Session ID: 2D07
Published: 2004
Released on J-STAGE: February 23, 2007
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Yayoi Miura, Akira Yamaguchi, Keisuke Nagao
Session ID: 2D08
Published: 2004
Released on J-STAGE: February 23, 2007
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Shoichi Itoh, Sara Russell, Hisayoshi Yurimoto
Session ID: 2D09
Published: 2004
Released on J-STAGE: February 23, 2007
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Amoeboid olivine aggregates (AOAs) are major types of refractory objects in carbonaceous chondrites (CC). However, AOAs from ordinary chondrites (OC) have not been reported, even though fine-grained CAIs from OC have been found. Here we report the petrography and isotopic compositions of AOAs from the Semarkona LL3.0 chondrite, in order to compare the petrography and isotopes of AOAs in OC and CC, and establish the genetic relationships between CAIs and AOAs in the early solar system.
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Miwa Yoshitake, Hisayoshi Yurimoto
Session ID: 2D10
Published: 2004
Released on J-STAGE: February 23, 2007
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Kazuhide Nagashima, Alexander Krot, Russell Sara, Hisayoshi Yurimoto
Session ID: 2D11
Published: 2004
Released on J-STAGE: February 23, 2007
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Sachio Kobayashi, Azusa Tonotani, Kazuhide Nagashima, Alexander N. Kro ...
Session ID: 2D12
Published: 2004
Released on J-STAGE: February 23, 2007
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yuuki koyama, Jing Zhang, takasi hagiwara, hiroshi satake, kazumi asai
Session ID: 2P01
Published: 2004
Released on J-STAGE: February 23, 2007
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Takashi Hagiwara, Jing Zhang, yuuki koyama, Tetuya Nakamura, Kazumi As ...
Session ID: 2P02
Published: 2004
Released on J-STAGE: February 23, 2007
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Mariko Hatta, Jing Zhang, zyoji Ishizaka, Yasunobu Mitsuhashi, Yuzuru ...
Session ID: 2P03
Published: 2004
Released on J-STAGE: February 23, 2007
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MASATOSHI YAMADA, JIAN ZHENG, TATSUO AONO
Session ID: 2P04
Published: 2004
Released on J-STAGE: February 23, 2007
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Asami Uchida, Manabu Nishizawa, Kotaro Shirai, Naoto Takahata, Yuji Sa ...
Session ID: 2P05
Published: 2004
Released on J-STAGE: February 23, 2007
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Kazuhiro Norisuye, Masako Ezoe, Yoshiki Sohrin
Session ID: 2P06
Published: 2004
Released on J-STAGE: February 23, 2007
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Distribution of trace metals in seawater can keenly reflect physical, chemical and biological processes occurring in the ocean. The Sulu Sea (the Phillipines) is a semi-enclosed basin enclosed by shallow sills, showing quite different characteristics from those of open sea in terms of inputs of lithogenic materials and deep water circulation. However, few sutides have been made for distribution of trace metals in the Sulu Sea. In this study, we will reveal the distribution of trace metals, such as Fe, Co, Ni, Cu, Zn, Cd and Pb in the Sulu Sea, and its adjacent seas, the Celebes Sea, South China Sea and western part of the Northwest Pacific.
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Hirofumi Tazoe, Hajime Obata, Toshitaka Gamo
Session ID: 2P07
Published: 2004
Released on J-STAGE: February 23, 2007
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Hironobu Nishitani, Jing Zhang, Hisashi Narita, Jordan Richard
Session ID: 2P08
Published: 2004
Released on J-STAGE: February 23, 2007
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Momoko Arisawa, Jing Zhang, Hironobu Nishitani, Hisashi Narita, Jordan ...
Session ID: 2P09
Published: 2004
Released on J-STAGE: February 23, 2007
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RUMI SATO, JING ZHANG, HIROKO YAMAKOSHI, HIROSHI SATAKE, AKIRA TAKEUCH ...
Session ID: 2P10
Published: 2004
Released on J-STAGE: February 23, 2007
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motoki sasakawa, sohiko kameyama, shinsuke kawagucci, fumiko nakagawa, ...
Session ID: 2P11
Published: 2004
Released on J-STAGE: February 23, 2007
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sohiko kameyama, Shinsuke Kawagucci, Fumiko Nakagawa, Motoki Sasakawa, ...
Session ID: 2P12
Published: 2004
Released on J-STAGE: February 23, 2007
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KEIKO SATO, YOSHIYUKI TATSUMI, TOHRU DANHARA, HAJIMU TAMURA
Session ID: 2P13
Published: 2004
Released on J-STAGE: February 23, 2007
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The Setouchi volcanic belt in SW Japan is characterized by the occurrence of high-Mg andesites (HMAs) having unusually high Mg concentrations. The compositional similarity between such HMAs and the inferred bulk continental crust may suggest the genetic linkage between them. HMAs would have formed under unusual tectonic settings, as basaltic magmas are produced dominantly in the mantle wedge of modern subduction zones. Therefore, knowledge of the tectonic settings of particular convergent margins where HMA magmatism has taken place is critical. This study presents K-Ar, Ar-Ar and FT age data for volcanic rocks including HMAs and related andesites from the Seotuchi volcanic belt, and demonstrates the tectonic setting of formation of that characteristic volcanic arc.
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miho murata, yoshio takahashi, hiroshi shimizu
Session ID: 2P14
Published: 2004
Released on J-STAGE: February 23, 2007
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Masana Morioka, Gou Abe
Session ID: 2P15
Published: 2004
Released on J-STAGE: February 23, 2007
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Spessartin, one of the Silicate Garnet, is successfully grown by CZ-method. The diffusion coefficient of Co in spessartin was determined.
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Natsumi Kamiya, Fumiaki Tsunomori, Hiroyuki Kagi
Session ID: 2P16
Published: 2004
Released on J-STAGE: February 23, 2007
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Session ID: 2P17
Published: 2004
Released on J-STAGE: February 23, 2007
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Takeshi Iiyama, Hitoshi Sakai, Kiyoshi Nomura, Masashi Takahashi, Masu ...
Session ID: 2P18
Published: 2004
Released on J-STAGE: February 23, 2007
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The Moessbauer spectrometer manipulated by robotic arm of NASA Opportunity Rovers landed on Mars discovered the mineral of Jarosite. This proved the existence of water in the past on Mars. So far a few studies on Jarosites produced on earth have been done. So it is important to determine the Moessbauer parameters of Jarosites produced in different places on earth.
We have been measuring the Moessbauer spectra of Jarosites on the earth. It is possible that Moessbauer parameters of Mikasaite is to be similar with those of Jarosites. If so the deduction of NASA about the existence of water might be wrong. So we are planning to measure the Moessbauer spectrum of Mikasaite
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Katsuhiko SUZUKI, Xiachen ZHI, Kyoko ABE
Session ID: 2P19
Published: 2004
Released on J-STAGE: February 23, 2007
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Katsuhiko SUZUKI, Jifeng XU, Yi-Gang XU, Long XIAO, Hou-jun MEI, Jie ...
Session ID: 2P20
Published: 2004
Released on J-STAGE: February 23, 2007
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Hikari Kamioka, Yutaka Kanai, Hitoshi Tsukamoto, Yoshio Watanabe
Session ID: 2P21
Published: 2004
Released on J-STAGE: February 23, 2007
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Takashi Miyazaki, Tomoyuki Shibata, Masako Yoshikawa
Session ID: 2P22
Published: 2004
Released on J-STAGE: February 23, 2007
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The existence of long lived enriched lithospheric mantle is known beneath the Dharwar and periphery area in south India. Although the event of mantle enrichment occurred at the late Archaean is now controversial, but it is significant topic to reveal the early history of the Dharwar craton. It is understood that the late Archaean subduction was major event in the history of the Dharwar craton and generated the long lived enriched lithospheric mantle.
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KATSUNORI GOTAN, SHUN'ICHI NAKAI, HIROYUKI MATSUZAKI
Session ID: 2P23
Published: 2004
Released on J-STAGE: February 23, 2007
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Cosmogenic Be-10 is an important tracer for understanding the volcanioc process in a subduction zone. We examined separation of beryllium from volcanic rock samples, for determination of Be-10 in volcanic rocks by AMS measurement.
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Qing Chang, Tomoyuki Shibata, Kazunori Shinotsuka, Masako Yoshikawa, Y ...
Session ID: 2P24
Published: 2004
Released on J-STAGE: February 23, 2007
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High field strength element (denoted as HFSE, including zirconium, niobium, hafnium and tantalum) serve as important tools in characterizing mantle reservoir and evolution processes. However, the determination of these elements for rock samples is particularly difficult, because they often reside in refractory minerals that are resistant to acid attack and are not chemically stable in simple nitric solution which is preferred in ICP-MS analysis. Trueness of Zr and Hf yielded from commonly used mixed acid digestion strongly are significantly subject to mineralogical composition of rocks. We improved both acid and alkali-fusion digestion methods to enhance the decomposition efficiency and to reduce blank and matrix effect for these two digestion techniques, respectively.
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Taehoon KIM, Shun'ichi NAKAI, Naoji SUGIURA, Hajime HIYAGON, Akiko MIY ...
Session ID: 2P25
Published: 2004
Released on J-STAGE: February 23, 2007
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Recent studies have proposed Li isotopes as a significant tracer providing constraints on the mantle heterogeneity and material recycling. We carried out in-situ analyses of Cpx grains in various mantle xenoliths using SIMS for the determination of internal standards. The results of high d7Li (ca. +5 permil) values are consistent with that of MC-ICP-MS. On the other hand, Cpx grains of lower d7Li (< -11 permil) indicate the variations in Li concentration and the d7Li value even in a single grain, which are not suitable for internal standards. Lower d7Li values and heterogeneity of Li in Cpx grains are suspected to result from the metasomatic fluid.
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Kazunori Shinotsuka, Katsuhiko Suzuki, Yoshiyuki Tatsumi
Session ID: 2P26
Published: 2004
Released on J-STAGE: February 23, 2007
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Ryoko Senda, Tsuyoshi Tanaka
Session ID: 2P27
Published: 2004
Released on J-STAGE: February 23, 2007
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