研究者詳細 - 田中　亮吏

論文 - 田中　亮吏

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Lithium, boron and lead isotope systematics on glass inclusions in olivine phenocrysts from Hawaiian lavas 査読

K Kobayashi, R Tanaka, T Moriguti, K Shimizu, E Nakamura

GEOCHIMICA ET COSMOCHIMICA ACTA 67 ( 18 ) A223 - A223 2003年9月

Comprehensive geochemical analyses of small amounts (100 mg) of extraterrestrial samples for the analytical competition related to the sample-return mission, MUSES-C. 査読

Nakamura, E, Makishima, A, Moriguti, T, Kobayashi, K, Sakaguchi, C, Yokoyama, T, Tanaka, R, Kuritani, T, Takei, H

Institute of Space and Astronautical Science Report SP 16 49 - 101 2003年

記述言語：英語出版者・発行元：宇宙航空研究開発機構

We have participated in the analytical competition related to the sample-return mission, MUSES-C of the ISAS, to be launched in May 2003 and returned in summer 2007. In this competition, we have determined major and trace element abundances and isotopes (as many as possible), both for two powdered samples provided by the ISAS and for chondrules separated from Allende meteorite as an additional demonstration of our high-spatial resolution analytical capabilities for fragment samples. 100 mg of each of the competition samples, 1C and 2C, were split into two fractions of approximately 30 and 70 mg for the determinations of elemental abundances and the isotope analyses, respectively. The bulk concentrations of 55 elements in each 30 mg sample were analyzed by quadruple-type ICP-MS and sector-type ICP-MS with analytical uncertainties better than 10 percent (1 sigma). B, Pb, Li, Rb, Sr, Sm and Nd were successively separated from the remaining 70 mg of each of the samples, using a novel integrated, multi-ion exchange column chemistry approach, and then the isotopes of these elements were successfully determined by TIMS with analytical errors similar to those for analyses of terrestrial samples. The Sr, Nd, Re and Os isotopic compositions were also analyzed using the remaining aliquots of the sample solutions for trace element analyses by ICP-MS. The results obtained in this study indicate that 1C and 2C samples are probably ordinary chondrite and the Allende meteorite, respectively. However, extreme W, Ta and Nb enrichments in the 1C were probably caused by contamination during sample preparation. Furthermore, both of the samples were extensively contaminated by B from the borosilicate glass container in which the samples were delivered. Five chondrules were separated from Allende meteorite and then sliced into three pieces using a dicing saw. The center slices were used to petrographically determine the mineral phases, compositionally map these phases by SEM-EDX, and obtain quantitative major and trace element compositions (30 elements) by SEM-EDX and ion microprobe. The two outer slices, for which sample masses were less than 1 mg, were chemically treated to obtain the bulk trace elements and isotope compositions of the chondrules. For the chondrule slices, 24 trace elements and Sr and Nd isotopic compositions were determined with extremely small analytical uncertainties by ICP-MS and TIMS (for Sr and Nd, respectively). Based on the analytical experience, including this competition, we believe that all of the analyses carried out could have been completed within 50 days if we could have concentrated on this project alone during that 50-day period. In this report, we describe the analytical techniques employed for the powdered samples and the chondrules, and we present all of the results obtained during the approximately 3-month period of the analytical competition.

CiNii Article

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Re-Os age of molybdenite from the Busetsu two-mica granite, central Japan.

Ishihara, S, Stein, H. J, Tanaka, R

Bulletin of the Geological Survey of Japan 53 ( 5 ) 479 - 482 2002年

Geochemical evolution of koolau volcano. Hawaii 査読

Ryoji Tanaka, Eizo Nakamura, Eiichi Takahashi

Geophysical Monograph Series 128 311 - 332 2002年

記述言語：英語掲載種別：論文集(書籍)内論文出版者・発行元：Blackwell Publishing Ltd

Major and trace-element and Sr, Nd, and Pb isotopic compositions have been determined for Koolau shield lavas and Nuuanu and Wailau landslide deposits, Hawaii. The Koolau shield is composed of older main shield-stage and younger Makapuu-stage lavas. Lavas of the main shield-stage are exposed low in the subaerial Nuuanu Pali and in Nuuanu landslide deposits. Main shield-stage lavas resemble Loa- or Kea-type compositions
they are characterized by lower Ba/Nb, La/Nb, Pb/Nd, Sr/Nb, Nd/Nb, Zr/Nb, and 87Sr/86Sr, and by higher 143Nd/144Nd and 206Pb/204Pb than those of Makapuu-stage lavas (Koolau-type). Sr-Nd-Pb isotope systematics suggest that Koolau shield lavas were generated from at least three endmembers, such as: Enriched Makapuu (EMK), Depleted Makapuu (DMK), and Kea (KEA) components. The proportion of these endmembers successively changed from earlier KEA-dominated to later EMK-dominated. Koolau shield-stage lavas span nearly the entire range of the isotopic compositions reported previously for shield-stage lavas from all Hawaiian islands, and reveal secular changes in the amounts of plume components.

DOI： 10.1029/GM128p0311

Scopus

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ハワイアンプリューム端成分としてのマントル捕獲岩の発見?

中村栄三, 坂口千恵, 田中亮吏, 森口拓弥, 久城育夫

日本岩石鉱物鉱床学会学術講演会講演要旨集 2002 251 - 251 2002年

Paired sulfur isotopic belts: late Cenozoic ore deposits of Southwest Japan.

Ishihara, S, Sasaki, A, Minagawa, T, Bunno, M, Shishido, A, Tanaka, R

Bulletin of the Geological Survey of Japan 51 ( 7 ) 283 - 297 2000年

The discovery of Indo-Sinian granites in Manchzhouli area: Evidence from Rb-Sr isochrons.

Qin, K. Z, Tanaka, R, Li, W. S, Ishihara, S

Acta Petrologica et Mineralogica 17 235 - 240 1998年

The timing and geneses of ilmenite-series and magnetite-series granitic magmatism in the north-central Hokkaido, Japan.

Ishihara, S, Matsuhisa, Y, Tanaka, R, Ihara, H, Nagasaka, A, Koike, T, Shibata, K

Bulletin of the Geological Survey of Japan 49 ( 12 ) 605 - 620 1998年

Sr and Nd isotopic data for the seven GSJ rock reference samples; JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1 and JR-1 査読

Y Orihashi, J Maeda, R Tanaka, R Zeniya, K Niida

GEOCHEMICAL JOURNAL 32 ( 3 ) 205 - 211 1998年

記述言語：英語出版者・発行元：GEOCHEMICAL SOC JAPAN

We measured Sr-87/Sr-86 and Nd-143/Nd-144 ratios and carried out analytical test of Sr and Nd isotopic standards for the seven GSJ rock reference samples (hereafter GSJ-RRSs); JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1 and JR-1. Our mean values of five separate analyses for the GSJ-RRSs are summarized in Table 1, in agreement with the ranges of previously published data. Our mean values for 87Sr/86Sr ratios of JB-2 and JGb-1 and Nd-143/Nd-144 ratio of JR-1, however, show a slightly large Variation as compared with the other JGS-RRSs. Further data accumulation with specification of split/position number is required to evaluate homogeneity in Sr and Nd isotopic compositions.

DOI： 10.2343/geochemj.32.205

Web of Science

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Chemical and mineralogical characteristics of the Kanamaru pegmatite deposit, Niigata prefecture, Japan.

Nanbu, A, Hamano, K, Tanaka, R, Ishihara, S

Resource Geology 47 1 - 10 1997年