"Fujita, R.,Nakano, S.,Yokoyama, T.,Ishikawa, A.","Applicability of quartz tube digestion for the determination of highly siderophile and volatile chalcophile element abundances with Os isotopic compositions using ICP-MS/MS and N-TIMS",,"Geochemical Journal",," 58",," 9-27",2024,Jan. "Ihara Yuta,Akira Ishikawa,Tetsuya Yokoyama,Kenji Shimizu","Highly siderophile element geochemistry of Phanerozoic komatiites and related mafic-ultramafic rocks in Gorgona island, Columbia","Goldschmidt Lyon 2023",,,,,,2023,July "Akira Ishikawa,Tetsuya Yokoyama,Nao Nakanishi,Richard J. Walker","Highly siderophile elements and Os isotope compositions of Ryugu samples","Goldschmidt Lyon 2023",,,,,,2023,July "Ryo Fujita,Akira Ishikawa,Tetsuya Yokoyama,Michael Garcia","The thermal and chemical litho-stratigraphy beneath the Hawaiian Islands","Goldschmidt Lyon 2023",,,,,,2023,July "Akira Ishikawa,Ryo Fujita,Nao Nakanishi,Tetsuya Yokoyama","Simultaneous determination of volatile chalcophile and highly siderophile elements in carbonaceous chondrites by triple quadrupole ICP-MS after sealed-glass tube digestion","Japan Geoscience Union Meeting 2023",,,,,,2023,May "T. Hopp,N. Dauphas,Y. Abe,J. Ale?on,C. M. O' D. Alexander,S. Amari,Y. Amelin,K-I. Bajo,M. Bizzarro,A. Bouvier,R. W. Carlson,M. Chaussidon,B.-G. Choi,A. M. Davis,T. Di Rocco,W. Fujiya,R. Fukai,I. Gautam,M. K. Haba,Y. Hibiya,H. Hidaka,H. Homma,P. Hoppe,G. R. Huss,K. Ichida,T. Iizuka,T. R. Ireland,A. Ishikawa,M. Ito,S. Itoh,N. Kawasaki,N.T. Kita,K. Kitajima,T. Kleine,S. Komatani,A. N. Krot,M.-C. Liu,Y. Masuda,K. D. McKeegan,M. Morita,K. Motomura,F. Moynier,I. Nakai,K. Nagashima,D. Nesvorny?,A. Nguyen,L. Nittler,M. Onose,A. Pack,C. Park,L. Piani,L. Qin,S.S. Russell,N. Sakamoto,M. Scho?nba?chler,L. Tafla,H. Tang,Y. Terada,T. Usui,S. Wada,M. Wadhwa,R. J. Walker,K. Yamashita,Q.-Z. Yin,T. Yokoyama,S. Yoneda,E. D. Young,H. Yui,A.-C. Zhang,T. Nakamura,H. Naraoka,T. Noguchi,R. Okazaki,K. Sakamoto,H. Yabuta,M. Abe,A. Miyazaki,A. Nakato,M. Nishimura,T. Okada,T. Yada,K. Yogata,S. Nakazawa,T. Saiki,S. Tanaka,F. Terui,Y. Tsuda,S. Watanabe,M. Yoshikawa,S. Tachibana,H. Yurimoto","Ryugu's nucleosynthetic heritage from the outskirts of the Solar System",,"Science Advances",," 8",,,2022,Oct. "田村 達也,横山 哲也,石川 晃","神津島の流紋岩及び玄武岩質捕獲岩のMo安定同位体組成","日本地球化学会第69回年会",,,,,,2022,Sept. "Akira Ishikawa,Shun Nakano,Ryo Fujita,Tetsuya Yokoyama","Simple and accurate determination of chalcophile and highly siderophile elements in carbonaceous chondrites using triple quadrupole ICP-MS","Goldschmidt Hawai'i 2022",,,,,,2022,July "T. Yokoyama,K. Nagashima,I. Nakai,E. D. Young,Y. Abe,J. Ale?on,C. M. O'D. Alexander,S. Amari,Y. Amelin,K.-I. Bajo,M. Bizzarro,A. Bouvier,R. W. Carlson,M. Chaussidon,B.-G. Choi,N. Dauphas,A. M. Davis,T. di Rocco,W. Fujiya,R. Fukai,I. Gautam,M. K. Haba,Y. Hibiya,H. Hidaka,H. Homma,P. Hoppe,G. R. Huss,K. Ichida,T. Iizuka,T. R. Ireland,A. Ishikawa,M. Ito,S. Itoh,N. Kawasaki,N. T. Kita,K. Kitajima,T. Kleine,S. Komatani,A. N. Krot,M.-C. Liu,Y. Masuda,K. D. Mckeegan,M. Morita,K. Motomura,F. Moynier,A. Nguyen,L. Nittler,M. Onose,A. Pack,C. Park,L. Piani,L. Qin,S. S. Russell,N. Sakamoto,M. Scho?nba?chler,L. Tafla,H. Tang,K. Terada,Y. Terada,T. Usui,S. Wada,M. Wadhwa,R. J. Walker,K. Yamashita,Q.-Z. Yin,S. Yoneda,H. Yui,A.-C. Zhang,H. C. Connolly,H. Sawada,H. Senshu,Y. Shimaki,K. Shirai,S. Sugita,Y. Takei,H. Takeuchi,S. Tanaka,E. Tatsumi,F. Terui,Y. Tsuda,R. Tsukizaki,K. Wada,S.-i. Watanabe,M. Yamada,T. Yamada,Y. Yamamoto,H. Yano,Y. Yokota,K. Yoshihara,M. Yoshikawa,K. Yoshikawa,S. Furuya,K. Hatakeda,T. Hayashi,Y. Hitomi,K. Kumagai,A. Miyazaki,A. Nakato,M. Nishimura,H. Soejima,A. Suzuki,T. Yada,D. Yamamoto,K. Yogata,M. Yoshitake,S. Tachibana,H. Yurimoto","Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites",,"Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites",," 379",,,2022,June "Shun Nakano,Akira Ishikawa,Yuichiro Ueno,Tetsuya Yokoyama","Siderophile elements in Paleoarchean Camel Creek komatiites from East Pilbara Terrane, Western Australia: implications for secular evolution of Archean-Proterozoic mantle","Japan Geoscience Union Meeting 2022",,,,,,2022,May "Ihara Yuta,Akira Ishikawa,Kenji Shimizu,Tetsuya Yokoyama","Mantle sources of Phanerozoic komatiite from Gorgona Island, Colombia: Implication from osmium isotope heterogeneity","Japan Geoscience Union Meeting 2022",,,,,,2022,May "Tatsuya Tamura,Tetsuya Yokoyama,Akira Ishikawa,Takeshi Kuritani,Ikshu Gautam","Molybdenum isotopic compositions in volcanic rocks from the Izu islands","Japan Geoscience Union Meeting 2022",,,,,,2022,May "Yuki Masuda,Tetsuya Yokoyama,Satoki Okabayashi,Akira Ishikawa,Hikaru Iwamori","Chemical and Isotopic Evaluation of a Microsampling Method using Laser Ablation and Membrane Filter",,"Geostandards and Geoanalytical Research",,"Vol. 46","No. 2","p. 205-222",2022,Mar. "Takashi Yoshizaki,Richard Ash,Marc Lipella,Tetsuya Yokoyama,William McDonough","Variable refractory lithophile element compositions of planetary building blocks: Insights from components of enstatite chondrites",,"Geochimica et Cosmochimica Acta",,"Vol. 308",,"pp. 173-187",2021,Sept. "Shun Nakano,Akira Ishikawa,Yuichiro Ueno,Tetsuya Yokoyama","Highly siderophile elements behavior in the Paleoarchean Camel Creek komatiites from East Pilbara Terrane, Western Australia","Goldschmidt Virutal 2021",,,,,,2021,July "Akira Ishikawa,越田 渓子,鈴木 勝彦,Tetsuya Yokoyama,小宮 剛","Highly siderophile elements in Earth's oldest rocks from Acasta Gniess Complex, Canada: an impact melt origin or not?","日本地球惑星科学連合2021年大会",,,,,,2021,June "Hajime Taniuchi,Takeshi Kuritani,Tetsuya Yokoyama,Eizo Nakamura,Mitsuhiro Nakagawa","A new concept for the genesis of felsic magma: the separation of slab-derived supercritical liquid",,"Scientific Reports",,,,,2020,Dec. "Hitomi Nakamura,Ayane Sano,Saya Kagami,Tetsuya Yokoyama,Akira Ishikawa,Tsuyoshi Komiya,Hikaru Iwamori","Compositional heterogeneity of Archean mantle estimated from Sr and Nd isotopic systematics of basaltic rocks from North Pole, Australia, and the Isua supracrustal belt, Greenland",,"Precambrian Research",,,,,2020,Sept. "Takeshi Kuritani,Mitsuhiro Nakagawa,Jumpei Nishimoto,Tetsuya Yokoyama,Tsuyoshi Miyamoto","Magma plumbing system for the Millennium Eruption at Changbaishan volcano, China: Constraints from whole-rock U?Th disequilibrium",,"Lithos",,,,,2020,Aug. "Tatsuya Tamura,Tetsuya Yokoyama,Akira Ishikawa","神津島流紋岩及び玄武岩質捕獲岩の地球化学的研究","JpGU-AGU Joint Meeting",,,,,,2020,June "Natuski Nakamura,Akira Ishikawa,Tetsuya Yokoyama","Highly siderophile element mobility during serpentinization of forearc mantle peridotite","JpGU-AGU Joint Meeting",,,,,,2020,June "Akira Ishikawa,Keiko Koshida,Katsuhiko Suzuki,Tetsuya Yokoyama,Tsuyoshi Komiya","No Impact Signatures in Earth’s Oldest Rocks from Acasta Gneiss Complex, Canada","Goldschmidt2020",,,,,,2020,June "Yuki Masuda,Tetsuya Yokoyama,Satoki Okabayashi,Akira Ishikawa","Development of Laser Ablation with Filter (LAF) Sampling Method for Micro-Scale Isotopic Analysis of Geologic Materials","Goldschmidt2020",,,,,,2020,June "Ryo Fujita,Akira Ishikawa,Tetsuya Yokoyama,Michael O. Garcia","Ancient Origin of Hawaiian Xenoliths: Fragments of Mantle Plume?","Goldschmidt2020",,,,,,2020,June "Shun Nakano,Akira Ishikawa,Yuichiro Ueno,Tetsuya Yokoyama","コマチアイトの強親鉄性元素地球化学?マントル進化史の解明に向けて?","JpGU-AGU Joint Meeting",,,,,,2020,June "Ryo Fujita,Akira Ishikawa,Tetsuya Yokoyama,Michael Garcia","ハワイ諸島産マントル捕獲岩の全岩オスミウム同位体と強親鉄性元素組成","JpGU-AGU Joint Meeting",,,,,,2020,June "Tetsuya Yokoyama,Ryota Fukai,Masaki Nakahara","Separation of Heavy Lanthanoids by Flash Column Chromatography for Precise Determination of Er and Yb Isotope Compositions in Rock Samples",,"Geostandards and Geoanalytical Research",,"Vol. 44","No. 2","pp. 265-285",2020,June "Ryota Moriwaki,Tomohiro Usui,Minato Tobita,Tetsuya Yokoyama","Geochemically heterogeneous Martian mantle inferred from Pb isotope systematics of depleted shergottites",,"Geochimica et Cosmochimica Acta",,"Vol. 274",,"pp. 157-171",2020,Apr. "Asobo Nkengmatia Asaah,Tetsuya Yokoyama,Festus T. Aka,Hikaru Iwamori,Takeshi Kuritani,Tomohiro Usui,M. Gountie Dedzo,J. Tamen,T. Hasegawa,M.J. Wirmvem,A.L. Nche","Major/trace elements and Sr?Nd?Pb isotope systematics of lavas from lakes Barombi Mbo and Barombi Koto in the Kumba graben, Cameroon volcanic line: Constraints on petrogenesis",,"Journal of African Earth Sciences",,,,,2020,Jan. "Satoki Okabayashi,Tetsuya Yokoyama,TAKAFUMI HIRATA,Kazuo Terakado,Erik M. Galimov","Iron isotopic composition of very low-titanium basalt deduced from the iron isotopic signature in Luna 16, 20, and 24 soils",,"Geochimica et Cosmochimica Acta",,"Vol. 269",,"pp. 1-14",2020,Jan. "Saya Kagami,Makiko Haba,Tetsuya Yokoyama,Tomohiro Usui,Richard C. Greenwood","Geochemistry and Sm‐Nd chronology of a Stannern‐group eucrite, Northwest Africa 7188",,"Meteoritics & Planetary Science",,,,,2019,Nov. "Ryota Fukai,Tetsuya Yokoyama","Assessment of the secondary instrumental fractionation in TIMS: Implication for high-precision Nd isotope analysis of geological samples",,"GEOCHEMICAL JOURNAL",,,,,2019,Oct. "Tetsuya Yokoyama,Yuichiro Nagai,Ryota Fukai,TAKAFUMI HIRATA","Origin and Evolution of Distinct Molybdenum Isotopic Variabilities within Carbonaceous and Noncarbonaceous Reservoirs",,"The Astrophysical Journal",,,,,2019,Sept. "Ryota Fukai,Tetsuya Yokoyama","Nucleosynthetic Sr?Nd Isotope Correlations in Chondrites: Evidence for Nebular Thermal Processing and Dust Transportation in the Early Solar System",,"The Astrophysical Journal",,,,,2019,July "Nao Nakanishi,Tetsuya Yokoyama,Akira Ishikawa","Refinement of the micro-distillation technique for isotopic analysis of geological samples with pg-level osmium contents",,"Geostandards and Geoanalytical Research",,"Volume 43","No. 2","Page 231-243",2019,May "六鹿 悠,Akira Ishikawa,Tetsuya Yokoyama","Evaluation of digestion methods for Molybdenum concentration analysis for geological materials","日本地球惑星科学連合2019年大会",,,,,,2019,May "Satoki Okabayashi,Tetsuya Yokoyama,Nao Nakanishi,Hikaru Iwamori","Fractionation of highly siderophile elements in metal grains from unequilibrated ordinary chondrites: Implications for the origin of chondritic metals",,"Geochimica Et Cosmochimica Acta",,"Vol. 244",,"pp. 197-215",2019,Jan. "Nao Nakanishi,Tetsuya Yokoyama,Akira Ishikawa","Reassessment of chemical separation techniques for isotope analysis of pg-level Os with N-TIMS","American Geophysical Union 2018 Fall Meeting",,,,,,2018,Dec. "Takeshi Kuritani,Yamaguchi, Azusa,Fukumitsu, Sayuki,Nakagawa, Mitsuhiro,Matsumoto, Akiko,Tetsuya Yokoyama","Magma Plumbing System at Izu-Oshima Volcano, Japan: Constraints From Petrological and Geochemical Analyses",,"Frontiers in Earth Science",,"Vol. 6",,,2018,Oct. "Aka, Festus Tongwa,Hasegawa, Takeshi,Nche, Linus Anye,Asobo Nkengmatia Asaah,Mimba, Mumbfu Ernestine,Teitchou, Isidore,Ngwa, Caroline,Miyabuchi, Yasuo,Kobayashi, Tetsuo,Kankeu, Boniface,Tetsuya Yokoyama,Tanyileke, Gregory,Ohba, Takeshi,Hell, Joseph Victor,Kusakabe, Minoru","Upper Triassic mafic dykes of Lake Nyos, Cameroon (West Africa) I: K-Ar age evidence within the context of Cameroon Line magmatism, and the tectonic significance",,"Journal of African Earth Sciences",,"Vol. 141",,"pp. 49-59",2018,Feb. "Kunihiro Myojo,Tetsuya Yokoyama,Satoki Okabayashi,Shigeyuki Wakaki,Naoji Sugiura,Hikaru Iwamori","The Origin and Evolution of Nucleosynthetic Sr Isotope Variability in Calcium and Aluminum-rich Refractory Inclusions",,"Astrophysical Journal",,"Vol. 853","No. 1",,2018,Feb. "Nao Nakanishi,Tetsuya Yokoyama,Satoki Okabayashi,Tomohiro Usui,Hikaru Iwamori","Re-Os isotope systematics and fractionation of siderophile elements in metal phases from CBa chondrites",,"Meteoritics & Planetary Science",,"Vol. 53","No. 5","pp. 1051-1065",2018,Jan. "Ryota Fukai,Tetsuya Yokoyama","Neodymium isotope heterogeneity of ordinary and carbonaceous chondrites and the origin of non-chondritic Nd-142 compositions in the Earth",,"Earth and Planetary Science Letters",,"Vol. 474",,"pp. 206-214",2017,June "Ryota Moriwaki,Tomohiro Usui,Justin I.Simon,John H.Jones,Tetsuya Yokoyama,Minato Tobita","Coupled Pb isotopic and trace element systematics of the Tissint meteorite: Geochemical signatures of the depleted shergottite source mantle",,"Earth and Planetary Science Letters",,"Vol. 474",,"pp. 180-189",2017,June "Tetsuya Yokoyama,Yuichiro Nagai,Yuu Hinohara,Tomohiko Mori","Investigating the Influence of Non-Spectral Matrix Effects in the Determination of Twenty-Two Trace Elements in Rock Samples by ICP-QMS",,"Geostandards and Geoanalytical Research",,"Vol. 41","No. 2","pp. 221-242",2017,Apr. "Yusuke Fukami,Minato Tobita,Tetsuya Yokoyama,Ryota Moriwaki,Tomohiro Usui","Precise isotope analysis of sub-nanogram lead by total evaporation thermal ionization mass spectrometry (TE-TIMS) coupled with a Pb-204-Pb-207 double spike method",,"Journal of Analytical Atomic Spectrometry",,"Vol. 32","No. 4","pp. 848-857",2017,Feb. "Takeshi Kuritani,T Sakuyama,N Kamada,Tetsuya Yokoyama,M Naskagawa","Fluid-fluxed melting of mantle versus decompression melting of hydrous mantle plume as the cause of intraplate magmatism over a stagnant slab: Implications from Fukue Volcano Group, SW Japan",,"Lithos",,"Vol. 282",,"pp. 98-110",2017,Feb. "Minato Tobita,Tomohiro Usui,Tetsuya Yokoyama","New constraints on shergottite petrogenesis from analysis of Pb isotopic compositional space: Implications for mantle heterogeneity and crustal assimilation on Mars",,"Geochemical Journal",,"Vol. 51","No. 1","pp. 81-94",2017,Jan. "Yusuke Fukami,Tetsuya Yokoyama","Tellurium isotope compositions in acid leach fractions of carbonaceous chondrites",,"Geochemical Journal",,"Vol. 51","No. 1","pp. 17-29",2017,Jan. "Takuji Tsujimoto,Tetsuya Yokoyama,Kenji Bekki","Chemical Evolution of Pu-244 in the Solar Vicinity and Its Implications for the Properties of r-process Production",,"Astrophysical Journal Letters",,"Vol. 835","No. 1",,2017,Jan. "Ryota Fukai,Tetsuya Yokoyama,Saya Kagami","Evaluation of the long-term fluctuation in isotope ratios measured by TIMS with the static, dynamic, and multistatic methods: A case study for Nd isotope measurements",,"International Journal of Mass Spectrometry",,"Vol. 414",,"pp. 1-7",2017,Jan. "杉本 圭,深井 稜汰,Tetsuya Yokoyama,鏡味 沙耶,Makiko Haba","非炭素質コンドライト隕石の高精度Sr同位体測定",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 195",2017, "深井 稜汰,Tetsuya Yokoyama,杉本 圭,奥井 航,長谷川 翔","コンドライト隕石全岩のSr?Nd同位体異常に見られる初期太陽系の同位体二分性",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 194",2017, "森脇 涼太,臼井 寛裕,ジャスティン サイモン,ジョン ジョーンズ,Tetsuya Yokoyama","シャーゴッタイト隕石のPb同位体システマティクスに基づいた火星マントル初期分化の考察",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 189",2017, "劉 青雲,岩森 光,中村 仁美,Tetsuya Yokoyama","誤差を含む地球化学データのクラスタ分析",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 212",2017, "田辺 学,中田 亮一,臼井 寛裕,四垂 将志,Tetsuya Yokoyama","X線吸収微細構造分析による火星隕石中の炭酸塩の鉄化学種解析",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 137",2017, "深井 稜汰,Tetsuya Yokoyama","TIMSのイオン源で起きる二次的な質量依存分別: 超高精度Nd同位体分析に向けた検討",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 290",2017, "藤崎 渉,上田 修裕,須田 好,佐藤 友彦,松井 洋平,澤木 佑介,Tetsuya Yokoyama","前期シ゛ュラ紀トアルシアン期海洋無酸素事変時の超海洋中央部における炭素循環摂動と大規模火成活動の因果関係",,"日本地質学会学術大会講演要旨","一般社団法人 日本地質学会","Vol. 2017",,"pp. 285",2017, "飛田 南斗,浅沼 尚,深海 雄介,森脇 涼太,Tetsuya Yokoyama,臼井 寛裕","トータルエバポレーションTIMS (TE-TIMS) によるジルコンの高精度鉛同位体組成分析法の開発",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 295",2017, "明星 邦弘,Tetsuya Yokoyama,若木 重行,杉浦 直治","CVコンドライト中CAIの核合成起源Sr同位体の起源と進化",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 262",2017, "岡林 識起,Tetsuya Yokoyama,中西 奈央,岩森 光","LA-ICP-MS法による普通コンドライト金属相のHSE濃度分析",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 197",2017, "Tetsuya Yokoyama,深井 稜汰,辻本 拓司","隕石の核合成起源同位体異常とr-核種の起源",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 201",2017, "中西 奈央,Tetsuya Yokoyama","隕石試料中のサブピコグラムレベルのOs同位体測定に向けた化学処理法の再評価",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 291",2017, "八木 晃,Makiko Haba,岡林 識起,山口 亮,Tetsuya Yokoyama","石鉄隕石メソシデライトのジルコンの地球化学的研究",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 260",2017, "鏡味 沙耶,Tetsuya Yokoyama,臼井 寛裕,Makiko Haba,Richard C. Greenwood","Stannern trend ユークライトNorthwest Africa 7188の地球化学的特徴とSm?Nd年代学",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 266",2017, "四垂 将志,中田 亮一,臼井 寛裕,清水 健二,Tetsuya Yokoyama,高橋 嘉夫","X線吸収端近傍構造分析による火星隕石衝撃ガラス中の硫酸塩成分の検出",,"日本地球化学会年会要旨集","一般社団法人日本地球化学会","Vol. 64",,"pp. 136",2017, "Takeshi Kuritani,Tanaka, Mayumi,Tetsuya Yokoyama,Nakagawa, Mitsuhiro,Matsumoto, Akiko","Intensive Hydration of the Wedge Mantle at the Kuril Arc-NE Japan Arc Junction: Implications from Mafic Lavas from Usu Volcano, Northern Japan",,"Journal of Petrology",,"Vol. 57","No. 6","pp. 1223-1240",2016, "Tetsuya Yokoyama,Richard J. Walker","Nucleosynthetic Isotope Variations of Siderophile and Chalcophile Elements in the Solar System",,"Highly Siderophile and Strongly Chalcophile Elements in High-Temperature Geochemistry and Cosmochemistry",,"Vol. 81",,"pp. 107-160",2016, "Yuichiro Nagai,Tetsuya Yokoyama","Molybdenum isotopic analysis by negative thermal ionization mass spectrometry (N-TIMS): effects on oxygen isotopic composition",,"Journal of Analytical Atomic Spectrometry",,"Vol. 31","No. 4","pp. 948-960",2016, "Saya Kagami,Tetsuya Yokoyama","Chemical separation of Nd from geological samples for chronological studies using Sm-146-Nd-142 and Sm-147-Nd-143 systematics",,"Analytica Chimica Acta",,"Vol. 937",,"pp. 151-159",2016, "岡林 識起,Tetsuya Yokoyama,岩森 光","普通コンドライトに含まれるFe-Niメタル相の局所微量元素分析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 63",,"pp. 84",2016, "越田 渓子,Akira Ishikawa,Tetsuya Yokoyama,鏡味 沙耶,深井 稜汰,小宮 剛","アカスタ片麻岩体苦鉄質岩の142Nd同位体から制約する冥王代マントル進化",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 63",,"pp. 160",2016, "中西 奈央,Tetsuya Yokoyama,岡林 識起,臼井 寛裕,岩森 光","CRコンドライトNWA 801に含まれるメタル相の局所強親鉄性元素分析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 63",,"pp. 80",2016, "永井 友一朗,Tetsuya Yokoyama,平田 岳史","初期太陽系に存在する2種類の同位体リザバー:隕石のモリブデン同位体異常からの証拠",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 63",,"pp. 85",2016, "深海 雄介,飛田 南斗,Tetsuya Yokoyama,森脇 涼太,臼井 寛裕","トータルエバポレーションTIMSと204Pb-207Pbダブルスパイク法を併用した極微量鉛同位体分析手法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 63",,"pp. 181",2016, "四垂 将志,中田 亮一,臼井 寛裕,清水 健二,高橋 嘉夫,Tetsuya Yokoyama","X線吸収端近傍構造分析による火星隕石の硫黄化学種解析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 63",,"pp. 133",2016, "藤崎 渉,浅沼 尚,須田 好,鈴木 和恵,吉屋 一美,佐藤 友彦,澤木 佑介,松井 洋平,Tetsuya Yokoyama","中期三畳紀Anisianにおける古海洋環境の復元",,"日本地質学会学術大会講演要旨","一般社団法人 日本地質学会","Vol. 2016",,"pp. 568",2016, "Wataru Fujisaki,NA,tetsuya yokoyama,shinji yamamoto,SHIGENORI MARUYAMA","Constraints for the causes of mass extinction at the Triassic-Jurassic boundary based on high precision platinum group element analyses",,"BUNSEKI KAGAKU",,"Vol. 64","No. 5","pp. 341-348",2015,June "Tetsuya Yokoyama,Yusuke Fukami,Wataru Okui,Nobuaki Itou,Yamazaki, Hiroshi","Nucleosynthetic strontium isotope anomalies in carbonaceous chondrites",,"Earth and Planetary Science Letters",,"Vol. 416",,"pp. 46-55",2015, "森脇 涼太,臼井 寛裕,Tetsuya Yokoyama,J. I. Simon,J. H. Jones","火星隕石TissintのPb同位体分析に基づいた火星マントル化学進化の解明",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 62",,"pp. 236",2015, "深井 稜汰,Tetsuya Yokoyama,鏡味 沙耶","完全分解法を用いた炭素質コンドライト全岩の高精度Nd同位体比測定",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 62",,"pp. 229",2015, "Ryoji Tanaka,Tetsuya Yokoyama,Kitagawa, Hiroshi,Tesfaye, Demissie Bizuneh,Nakamura, Eizo","Evaluation of the applicability of acid leaching for the U-238-Th-230 internal isochron method",,"Chemical Geology",,"Vol. 396",,"pp. 255-264",2015, "中井 俊一,山崎 絵里香,Tetsuya Yokoyama,三船 温尚,齋藤 努,陳 建立,サフー ユービン","スズ同位体を用いた青銅器の産地推定の可能性",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 62",,"pp. 208",2015, "中西 奈央,Tetsuya Yokoyama,臼井 寛裕,岩森 光","局所サンプリングによるCBコンドライト中のメタル相におけるオスミウム同位体分析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 62",,"pp. 230",2015, "Asobo Nkengmatia Asaah,Tetsuya Yokoyama,Aka, Festus T.,Tomohiro Usui,Wirmvem, Mengnjo J.,Tchamabe, Boris Chako,Takeshi OHBA,Tanyileke, Gregory,Hell, J. V.","A comparative review of petrogenetic processes beneath the Cameroon Volcanic Line: Geochemical constraints",,"Geoscience Frontiers",,"Vol. 6","No. 4","pp. 557-570",2015, "Tetsuya Yokoyama,日野原 侑,永井 友一朗,森 智比古","113In-203Tlダブルスパイクを用いた同位体希釈内標準ICP-MS法による岩石の微量元素濃度測定",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 62",,"pp. 213",2015, "Asobo Nkengmatia Asaah,Tetsuya Yokoyama,Aka, Festus T.,Tomohiro Usui,Takeshi Kuritani,Wirmvem, Mengnjo J.,Hikaru Iwamori,Fozing, Eric M.,Tamen, Jules,Mofor, Gilbert Z.,Takeshi OHBA,Tanyileke, Gregory,Hell, J. V.","Geochemistry of lavas from maar-bearing volcanoes in the Oku Volcanic Group of the Cameroon Volcanic Line",,"Chemical Geology",,"Vol. 406",,"pp. 55-69",2015, "Nakamoto, T.,Takahashi, E.,Tsuda, A.,Nishida, K.,Okui, W.,Tetsuya Yokoyama,Yanagida, Y.,Okumura, S.,Nakamura, M.,Sasaki, O.","THREE-DIMENSIONAL EXTERNAL SHAPE AND INTERNAL STRUCTURE OF CHONDRULES IN ALLENDE CV3 CHONDRITE.","77th Annual Meeting of the Meteoritical-Society","METEORITICS & PLANETARY SCIENCE","WILEY-BLACKWELL","Vol. 49",,"pp. A296-A296",2014,Sept. "中本 泰史,高橋 栄一,津田 彩花,西田 圭佑,奥井 航,Tetsuya Yokoyama,柳田 泰宏,奥村 聡,中村 美千彦,佐々木 理","P1-39 アエンデ隕石中コンドリュールの3次元外形と内部組織の分析(ポスターセッション1,ポスター発表)",,"日本惑星科学会秋期講演会予稿集","日本惑星科学会","Vol. 2014",,"pp. "P1-39"",2014,Sept. "森脇 涼太,臼井 寛裕,Simon J. I.,Schmitt A.,MaKeegan K.,Tetsuya Yokoyama","P1-34 火星隕石Tissintに含まれる硫化鉄中の鉛同位体不均質(ポスターセッション1,ポスター発表)",,"日本惑星科学会秋期講演会予稿集","日本惑星科学会","Vol. 2014",,"pp. "P1-34"",2014,Sept. "Tetsuya Yokoyama,深海 雄介,永井 友一朗,中本 泰史","太陽系内の熱プロセスと隕石の重元素同位体異常",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 174",2014, "Yuichiro Nagai,Tetsuya Yokoyama","Chemical Separation of Mo and W from Terrestrial and Extraterrestrial Samples via Anion Exchange Chromatography",,"Analytical Chemistry",,"Vol. 86","No. 10","pp. 4856-4863",2014, "Masaoki Uno,Hikaru Iwamori,Hitomi Nakamura,Tetsuya Yokoyama,Ishikawa, Tsuyoshi,Tanimizu, Masaharu","Elemental transport upon hydration of basic schists during regional metamorphism: Geochemical evidence from the Sanbagawa metamorphic belt, Japan",,"Geochemical Journal",,"Vol. 48","No. 1","pp. 29-49",2014, "Erika Yamazaki,Nakai, S.,Sahoo, Y.,Tetsuya Yokoyama,Mifune, H.,Saito, T.,Chen, J.,Takagi, N.,Hokanishi, N.,Yasuda, A.","Feasibility studies of Sn isotope composition for provenancing ancient bronzes",,"Journal of Archaeological Science",,"Vol. 52",,"pp. 458-467",2014, "Yusuke Fukami,Tetsuya Yokoyama","Precise tellurium isotope analysis by negative thermal ionization mass spectrometry (N-TIMS)",,"Journal of Analytical Atomic Spectrometry",,"Vol. 29","No. 3","pp. 520-528",2014, "Hitomi Nakamura,Fujita, Y,Nakai, S,Tetsuya Yokoyama,Hikaru Iwamori","Rare earth elements and Sr?Nd?Pb isotopic analyses of the Arima hot spring waters, Southwest Japan: implications for origin of the Arima-type brine",,"J Geol Geosci",,"Vol. 3","No. 161","pp. 2",2014, "深井 稜汰,Tetsuya Yokoyama,高橋 宏和","超高精度同位体分析によるコンドライト隕石全岩のNd同位体比測定",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 170",2014, "鏡味 沙耶,Tetsuya Yokoyama","玄武岩質ユークライトの146Sm-142Nd年代測定に向けた高精度Nd同位体分析法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 180",2014, "深海 雄介,Tetsuya Yokoyama,奥井 航","Allende隕石の耐酸性残渣中のテルル同位体異常",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 175",2014, "永井 友一朗,Tetsuya Yokoyama","隕石同位体異常の検出に向けた表面電離型質量分析計によるモリブデン同位体比分析法の開発:酸素同位体組成変動による同位体比シフト",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 223",2014, "奥井 航,Tetsuya Yokoyama","アエンデコンドコンリュール及びマトリックスのストロンチウム安定同位体異常",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 176",2014, "佐野 文音,中村 仁美,小宮 剛,Tetsuya Yokoyama,宇野 正起,木村 純一,常 青,岩森 光","35-38億年前の玄武岩から推定されるマントルの不均質と物質循環",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 156",2014, "森脇 涼太,臼井 寛裕,Tetsuya Yokoyama,J. I. Simon,J. H. Jones","段階的酸処理法による火星隕石TissintのPb同位体分析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 61",,"pp. 182",2014, "森脇 涼太,臼井 寛裕,Tetsuya Yokoyama","P1-25 火星隕石Tissintの地球化学的研究 : 火星マントル化学進化の理解に向けて(ポスターセッション1,ポスター発表)",,"日本惑星科学会秋期講演会予稿集","日本惑星科学会","Vol. 2013",,"pp. "P1-25"",2013,Nov. "奥井 航,Tetsuya Yokoyama,中本 泰氏,高橋 栄一,佐々木 理,中村 美千彦,奥村 聡","P1-18 始原的隕石と斑状コンドリュールのストロンチウム安定同位体異常に関する研究(ポスターセッション1,ポスター発表)",,"日本惑星科学会秋期講演会予稿集","日本惑星科学会","Vol. 2013",,"pp. "P1-18"",2013,Nov. "Erika Yamazaki,Shun'ichi Nakai,Tetsuya Yokoyama,S. Ishihara,H. Tang","Tin Isotope Analysis of Cassiterites from Southeastern and Eastern Asia",,"Geochemical J.",,"Vol. 47",,"pp. 21-35",2013, "明星 邦弘,Tetsuya Yokoyama,佐野 有司,高畑 直人,杉浦 直治","CVコンドライトCAIのストロンチウム同位体異常と26Al-26Mg年代学",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 60",,"pp. 93",2013, "藤崎 渉,澤木 佑介,山本 伸次,Tetsuya Yokoyama,SHIGENORI MARUYAMA","トリアス紀・ジュラ紀深海堆積物中に保存された白金族元素濃度異常",,"日本地質学会学術大会講演要旨","一般社団法人 日本地質学会","Vol. 2013",,"pp. 022",2013, "SHIGENORI MARUYAMA,Masahiro Ikoma,Hidenori Genda,Tetsuya Yokoyama,Kei HIROSE,M. Santosh","The naked planet Earth: Most essential pre-requisite for the origin and evolution of life.",,"Geoscience Frontiers",,"Vol. 4",,"pp. 141-165",2013, "F.T. Aka,Tetsuya Yokoyama","Current status of the debate about the age of Lake Nyos dam (Cameroon) and its bearing on potential flood hazards.",,"Natural Hazards",,"Vol. 65",,"pp. 875-885",2013, "浅沼 尚,藤崎 渉,澤木 佑介,Tetsuya Yokoyama,SHIGENORI MARUYAMA","白金族元素濃度測定に基づいた遠洋性堆積物中の宇宙起源物質の検出",,"日本地質学会学術大会講演要旨","一般社団法人 日本地質学会","Vol. 2013",,"pp. 026",2013, "永井 友一朗,Tetsuya Yokoyama,岡林 識起","CAIに含まれる金属組成の年代測定に向けた超高精度タングステン同位体比分析法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 60",,"pp. 146",2013, "Asobo N.E. Asaah,Tetsuya Yokoyama,Festus T. Aka,臼井 寛裕,Mengnjo J. Wirmvem,Boris Chako Tchamabe,大場 武,Gregory Tanyileke,Joseph V. Hell","Geochemistry of tholeiitic basalts from the Nyos volcano in the Oku Volcanic Group (Cameroon Volcanic Line), west Africa: constraints on petrogenesis",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 60",,"pp. 60",2013, "Maureen Feineman,Takuya Moriguti,Tetsuya Yokoyama,Sakiko Terui,Eizo Nakamura","Sediment-enriched adakitic magmas from the Daisen volcanic field, Southwest Japan.",,"Geochem. Geophys. Geosystem.",,"Vol. DOI: 10.1002/ggge.20176",,,2013, "Tetsuya Yokoyama,山崎 洋","コンドライト隕石の超高精度Sr同位体測定に向けた新しい試料分解法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 60",,"pp. 148",2013, "Moynier, F.,Day, J. M. D.,Okui, W.,Tetsuya Yokoyama,Bouvier, A.,Walker, R. J.,Podosek, F. A.","PLANETARY SCALE Sr ISOTOPIC HETEROGENEITY","75th Annual Meeting of the Meteoritical-Society","METEORITICS & PLANETARY SCIENCE","WILEY-BLACKWELL","Vol. 47",,"pp. A283-A283",2012,July "渡辺 龍哉,Tetsuya Yokoyama","プレソーラー粒子の238U/232Th比および238U/235U比の測定に向けた極微量U・Th同位体測定技術の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 258",2012, "高橋 宏和,Tetsuya Yokoyama","Triton-plusを用いた超高精度142Nd/144Nd比測定法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 261",2012, "Tetsuya Yokoyama,岩森 光,上木 賢太","東北日本火山岩の238U-230Th放射非平衡",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 175",2012, "岡林 識起,Tetsuya Yokoyama,昆 慶明,平田 岳史","LAL-MC-ICPMSによる普通コンドライト構成物質の鉄同位体比測定",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 284",2012, "永井 友一朗,Tetsuya Yokoyama,Walker Richard","始原的なコンドライト隕石における超高精度モリブデン同位体比分析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 283",2012, "山崎 絵里香,中井 俊一,サフー ユービン,Tetsuya Yokoyama","スズ同位体比による青銅器のリサイクル使用の検証",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 330",2012, "奥井 航,Tetsuya Yokoyama","ダブルスパイクを用いた隕石試料の高精度84Sr/86Srおよび88Sr/86Sr比分析方法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 262",2012, "Asaah Asobo,Tetsuya Yokoyama,臼井 寛裕,Aka Festus,日下部 実,Tanyileke Greg,Hell J.V.,大場 武","Geochemical study of the Oku Volcanic Group lavas, Cameroon Volcanic Line, west Cameroon: Preliminary results from eight mafic lavas",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 59",2012, "小木曽 哲,岩森 光,Tetsuya Yokoyama","「地殻流体」によせて",,"地球化学","日本地球化学会","Vol. 46","No. 4","pp. 189-190",2012, "F. Moynier,J.M.D. Day,Wataru Okui,Tetsuya Yokoyama,A. Bouvier,R.J. Walker,F.A. Podosek","Planetary-scale strontium isotopic heterogeneity and the age of volatile depletion of early solar system materials.",,"Astrophys. J.",,"Vol. doi:10.1088/0004-637X/758/1/45",,,2012, "明星 邦弘,Tetsuya Yokoyama,佐野 有司,高畑 直人,杉浦 直治","消滅核種を用いたCO及びCVコンドライト隕石中のCAIの年代学及び重元素安定同位体に関する研究",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 59",,"pp. 256",2012, "Takeshi OHBA,日下部 実,上田 晃,辻村真貴,小園誠史,市原美恵,鈴木雄治郎,佐伯和人,金子克哉,Yasuo Miyabuchi,小林哲夫,穴澤活郎,須貝俊彦,吉田 裕,Akihiko Terada,吉川美由紀,Tetsuya Yokoyama,J. V. Hell,Luc Sigha,Greg Tanyileke,Issa,Fantong Wilson,F. T. Aka","カメルーン火口湖ガス災害防止の総合対策と人材育成","地球惑星科学関連学会2011年合同大会",,,,,,2011,May "Takeshi Kuritani,Tetsuya Tokoyama,Hiroshi Kitagawa,Katsura Kobayashi,Eizo Nakamura","Geochemical evolution of historical lavas from Askja Volcano, Iceland: Implications for mechanisms and timescales of magmatic differentiation.",,"Geochim. Cosmochim. Acta",,"Vol. 75",,"pp. 570-587",2011, "Satoki Okabayashi,Yoshiaki Kon,Takaomi D. Yokoyama,S. Yamamoto,Tetsuya Yokoyama,TAKAFUMI HIRATA","Evaluation of Laser Ablation in Liquid (LAL) technique as a new sampling technique for elemental and isotopic analysis using ICP-mass spectrometry.",,"J. Anal. Atom. Spectrom.",,"Vol. 26",,"pp. 1393-1400",2011, "森 智比古,Tetsuya Yokoyama","TIMS中で起きるPbの異常な質量分別",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 225-225",2011, "永井 友一朗,Tetsuya Yokoyama","始原的隕石における高精度Mo同位体比分析のための化学分離法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 289-289",2011, "深海 雄介,Tetsuya Yokoyama","N-TIMSによる始源的隕石中テルルの同位体異常の探索",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 227-227",2011, "明星 邦弘,Tetsuya Yokoyama,佐野 有司,高畑 直人,杉浦 直治","消滅核種を用いたCOコンドライト隕石中のCAIの年代学",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 224-224",2011, "岡林 識起,横山 隆臣,Tetsuya Yokoyama,平田 岳史","液中レーザーアブレーション法(LAL)を用いた普通コンドライトに含まれる風化生成物中の鉄同位体比測定",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 296-296",2011, "奥井 航,Tetsuya Yokoyama","始原的隕石のストロンチウム安定同位体比分析",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 228-228",2011, "高橋 宏和,Tetsuya Yokoyama","TIMSを用いた超高精度Nd同位体比測定法の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 229-229",2011, "Tetsuya Yokoyama,伊藤 伸朗,永井 友一朗","ステップワイズ法による始原的隕石の多元素同位体異常検出の試み",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 288-288",2011, "渡辺 龍哉,Tetsuya Yokoyama","岩石標準試料及び隕石の238U/235U同位体比測定",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 226-226",2011, "横山 隆臣,今井 崇暢,鈴木 敏弘,Tetsuya Yokoyama,高橋 栄一,MASAO TAKEYAMA,平田 岳史","親鉄性元素分析のための金属質標準試料の合成",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 58",,"pp. 315-315",2011, "T.A Chekol,Katsura Kobayashi,Tetsuya Yokoyama,Chie Sakaguchi,Eizo Nakamura","Timescales of magma differentiation from basalt to andesite beneath Hekla Volcano, Iceland: Constraints from U-series disequilibria in lavas from the last quarter-millennium flows.",,"Geochim. Cosmochim. Acta",,"Vol. 75",,"pp. 256-283",2011, "Tetsuya Yokoyama,C.M.O'D. Alexander,R.J. Walker","Assessment of nebular versus parent body processes on presolar components present in chondrites: Evidence from osmium isotopes.",,"Earth Planet. Sci. Lett.",,"Vol. 305",,"pp. 115-123",2011, "岡林 識起,横山 隆臣,Tetsuya Yokoyama,平田 岳史","元素・同位体分析を目的とした液中レーザーアブレーション法(LAL)の開発",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 57",,"pp. 144-144",2010, "深海 雄介,木村 純一,入澤 啓太,Tetsuya Yokoyama,平田 岳史","タングステン安定同位体組成からみたIIIAB 鉄隕石とパラサイトメイングループの関連性",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 57",,"pp. 272-272",2010, "Tetsuya Yokoyama,アレキサンダー コーネル,ウォーカー リチャード","始原的隕石の耐酸性残渣のオスミウム同位体異常から見た原始太陽系星雲と母天体プロセス",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 57",,"pp. 269-269",2010, "横山 隆臣,今井 崇暢,Tetsuya Yokoyama,高橋 栄一,鈴木 敏弘,MASAO TAKEYAMA,平田 岳史","親鉄性元素分析のための金属質標準物質の合成",,"日本地球化学会年会要旨集","日本地球化学会","Vol. 57",,"pp. 146-146",2010, "L. Qin,C.M.O'D. Alexander,R.W. Carlson,M.F. Horan,Tetsuya Yokoyama","Contributors to chromium isotope variation of meteorites.",,"Geochim. Cosmochim Acta",,"Vol. 74",,"pp. 1122-1145",2010, "Tetsuya Yokoyama,C.M.O'D. Alexander,R.J. Walker","Osmium isotope anomalies in chondrites: Results for acid residues and related leachates.",,"Earth Planet. Sci. Lett.",,"Vol. 291",,"pp. 48-59",2010, "Tetsuya Yokoyama,Richard J. Walker,David Walker","Low osmium solubility in silicate at high pressures and temperatures",,"Earth and Planetary Science Letters",,"Vol. 279",,"pp. 165-173",2009, "Festus T. Aka,Tetsuya Yokoyama,Minoru Kusakabe,Eizo Nakamura,Gregory Tanyileke,Bekoa Ateba,Vincent Ngako,Joseph Nnange,Joseph Hell","U-series dating of Lake Nyos maar basalts, Cameroon (West Africa): Implications for potential hazards on the Lake Nyos dam",,"Journal of Volcanology and Geothermal Research",,"Vol. 176",,"pp. 212-224",2008, "Takeshi Kuritani,Tetsuya Yokoyama,Eizo Nakamura","Generation of rear-arc magmas induced by influx of slab-derived supercritical liquids: Implications from alkali basalt lavas from Rishiri volcano, Kurile Arc",,"Journal of Petrology",,"Vol. 49",,"pp. 1319-1342",2008, "Tetsuya Yokoyama,Festus T. Aka,Minoru Kusakabe,Eizo Nakamura","Plume-lithosphere interaction beneath Mt. Cameroon volcano, West Africa: Constraints from 238U-230Th-226Ra and Sr-Nd-Pb isotope systematics",,"Geochimica et Cosmochimica Acta",,"Vol. 71",,"pp. 1835-1854",2007, "Tetsuya Yokoyama,Vinai K. Rai,Conel M. O'D. Alexander,Roy S. Lewis,Richard W. Carlson,Steven B. Shirey,Mark H. Thiemens,Richard J. Walker","Osmium isotope evidence for uniform distribution of s- and r-process components in the early solar system",,"Earth and Planetary Science Letters",,"Vol. 259",,"pp. 567-580",2007, "Takeshi Kuritani,Tetsuya Yokoyama,Eizo Nakamura","Rates of thermal and chemical evolution of a cooling magma chamber: a chronological and theoretical study on basaltic and andesitic lavas from Rishiri Volcano, Japan",,"Journal of Petrology",,"Vol. 48",,"pp. 1295-1319",2007, "Tetsuya Yokoyama,Takeshi Kuritani,Katsura Kobayashi,Eizo Nakamura","Geochemical evolution of a shallow magma plumbing system during the last 500 years, Miyakejima volcano, Japan: Constraints from 238U-230Th-226Ra systematics",,"Geochimica et Cosmochimica Acta",,"Vol. 70",,"pp. 2885-2901",2006, "Takeshi Kuritani,Tomohiro Usui,Tetsuya Yokoyama,Eizo Nakamura","Accurate isotopic and concentration analyses of small amounts of Pb using isotope dilution coupled with the double spike technique",,"Geostandards and Geoanalytical Research",,"Vol. 30",,"pp. 209-220",2006, "tetsuya yokoyama","ウラン系列短寿命核種の精密分析法の開発とマグマプロセス解明への応用",,"地球化学",,"Vol. 39",,"pp. 27-46",2005, "Tetsuya Yokoyama,Eizo Nakamura","Precise analysis of the 228Ra/226Ra isotope ratio for short-lived U-series disequilibria in natural samples by total evaporation thermal ionization mass spectrometry (TE-TIMS)",,"Journal of Analytical Atomic Spectrometry",,"Vol. 19",,"pp. 717-727",2004, "Takeshi Kuritani,Tetsuya Yokoyama,Katsura Kobayashi,Eizo Nakamura","Shift and rotation of composition trends by magma mixing: 1983 eruption at Miyake-jima volcano, Japan",,"Journal of Petrology",,"Vol. 44",,"pp. 1895-1916",2003, "Tetsuya Yokoyama,Katsura Kobayashi,Takeshi Kuritani,Eizo Nakamura","Mantle metasomatism and rapid ascent of slab components beneath island arcs: Evidence from 238U-230Th-226Ra disequilibria of Miyakejima volcano, Izu arc, Japan",,"Journal of Geophysical Research",,"Vol. doi: 10.1029/2002JB002103",,,2003, "Eizo Nakamura,Akio Makishima,Takuya Moriguti,Katsura Kobayashi,Chie Sakaguchi,Tetsuya Yokoyama,Ryoji Tanaka,Takeshi Kuritani,Hiroyuki Takei","Comprehensive geochemical analyses of small amounts (<100mg) of extraterrestrial samples for the analytical competition related to the sample- return mission, MUSES-C",,"The Institute of Space and Astronautical Science Report",,"Vol. Sp. No 16",,"pp. 49-101",2003, "Tetsuya Yokoyama,Eizo Nakamura","Precise determination of ferrous iron in silicate rocks",,"Geochimica et Cosmochimica Acta",,"Vol. 66",,"pp. 1085-1093",2002, "Tetsuya Yokoyama,Eizo Nakamura,Katsura Kobayashi,Takeshi Kuritani","Timing and trigger of arc volcanism controlled by fluid flushing from subducting slab",,"Proceedings of the Japan Academy",,"Vol. 78","No. Ser. B","pp. 190-195",2002, "Tetsuya Yokoyama,Akio Makishima,Eizo Nakamura","Precise analysis of 234U/238U ratio using UO2+ ion with thermal ionization mass spectrometry for natural samples",,"Chemical Geology",,"Vol. 181",,"pp. 1-12",2001, "Hiroyuki Takei,Tetsuya Yokoyama,Akio Makishima,Eizo Nakamura","Formation and suppression of AlF3 during HF digestion of rock samples in Teflon bomb for precise trace element analyses by ICP-MS and ID-TIMS",,"Proceedings of the Japan Academy",,"Vol. 77",,"pp. 13-17",2001, "tetsuya yokoyama","Development of precise isotope analysis of uranium and thorium for the study of uranium-thorium disequilibrium in the magma processes",,,,,,,1999,Mar. "Tetsuya Yokoyama,Akio Makishima,Eizo Nakamura","Evaluation of the coprecipitation of incompatible trace elements with fluoride during silicate rock dissolution by acid digestion",,"Chemical Geology",,"Vol. 157",,"pp. 175-187",1999, "Tetsuya Yokoyama,Shun'ich Nakai,Hiroshi Wakita","Helium and carbon isotopic compositions of hot spring gases in the TibetanPlateau",,"Journal of Volcanology and Geothermal Research",,"vol. 88",,"pp. 99-107",1999, "Tetsuya Yokoyama,Akio Makishima,Eizo Nakamura","Separation of Thorium and Uranium from Silicate Rock Samples Using Two Commercial Extraction Chromatographic Resins",,"Analytical Chemistry",,"Vol. 71",,"pp. 135-141",1999,