2010 Fiscal Year Annual Research Report
太古代チャートの多種同位体と微量元素の地球化学:海洋環境と生命活動記録の解明
Project/Area Number |
20340146
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Research Institution | Toho University |
Principal Investigator |
山口 耕生 東邦大学, 理学部, 准教授 (00359209)
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Co-Investigator(Kenkyū-buntansha) |
鈴木 勝彦 独立行政法人海洋研究開発機構, 地球内部変動研究センター, 主任研究員 (70251329)
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Keywords | 太古代 / チャート / 微量元素 / 同位体 / 微生物 |
Research Abstract |
オーストラリア北西部のPilbara地域で採取された、約34.6億年前のチャート及び約32億年前のチャート/縞状鉄鉱層の陸上掘削試料を用いて、太古代の海洋環境(例:酸化還元状態・成層構造・海底熱水活動の影響・海水温度)および微生物生命活動を制約することが、本申請研究の目的である。 平成20年度と21年度には、約34.6億年前のABDP試料及び約32億年前のDXCL-DP試料を各々約100試料について、粉末試料を制作して前処理を施し、高度分析装置であるICP-MSを用いて、無機元素分析を行った。その結果、膨大な量の高品質データが得られた。また、約50のチャート試料のケイ酸塩成分の酸素同位体分析を行い、同様に高品質データを得ることができた。平成22年度には、(1)以上のデータの詳細な検討を行って論文(Natureに投稿予定)を執筆し(共著者らが内部査読中)、(2)酸素同位体データに関しても論文原稿を執筆し、(3)鉄の同位体分析用の試料前処理をするために設計・設置したクリーンルームの整備および分析ラインの構築にとりかかった(修士論文のテーマとして学生を指導)。以上の他、論文発表も一流の国際誌(EPSL, Palaeo3等)に複数行った。 本研究は、研究代表者(山口)の従来の共同研究者らが同試料(約34.6億年前のABDP試料)を用いて行った関連研究(Hoashi et al.,2009)がNature Geoscienceに掲載される等、世界最先端で競争を行っているものであり、それと対をなす位置の本研究の意義は非常に高く、世界に先駆けて成果を発表することがとても重要である。 以上、研究開始3年目の昨年度も、以前に引き続き、申し分のない成果を挙げることができたと言える。
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Research Products
(36 results)
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[Journal Article] Iron and carbon isotope evidence for ecosystem and environmental diversity in the ~2.7 to 2.5 Ga Hamersley Basin, Western Australia2010
Author(s)
Czaja, A.D., Johnson, C.M., Beard, B.L., Eigenbrode, J.L., Freeman, K.H., Yamaguchi, K.E.
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Journal Title
Earth and Planetary Science Letters
Volume: 292
Pages: 170-180
Peer Reviewed
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[Journal Article] Geochemistry of modem carbonaceous sediments overlain by a water mass showing photic zone anoxia developed in the salime meromictic Lake Kai-ike, southwest Japan : I.Early diagenesis of organic carbon, nitrogen, and phosphorus2010
Author(s)
Yamaguchi, K.E., Oguri, K., Ogawa, N.O., Sakai, S., Hirano, S., Kitazato, H., Ohkouchi, N.
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Journal Title
Palaeogeography, Palaeoclimatology, Palaeoecology
Volume: 294
Pages: 72-82
Peer Reviewed
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[Journal Article] Enrichment of molybdenum in Mesoarchean black shales : A preliminary result of DXCL-DP (Dixon Island-Cleaverville Drilling Project), Pilbara, Western Australia2010
Author(s)
Yamaguchi, K.E., Sakamoto, R., Hosoi, K., Kiyokawa, S., Naraoka, H., Ikehara, M., Ito, T.
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Journal Title
Geological Survey of Western Australia, Record
Volume: 18
Pages: 398-400
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[Journal Article] Mesoarchean hydrothermal oceanic sedimentation and environment : DXCL-Drilling West Pilbara, Australia2010
Author(s)
Kiyokawa, S., Ito, T., Ikehara, M., Yamaguchi, K.E., Naraoka, H., Sakamoto, R., Koge, S., Hosoi, K., Suganuma, Y.
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Journal Title
Geological Survey of Western Australia, Record
Volume: 18
Pages: 375-377
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[Journal Article] Hydrothermal activity and iron sedimentation in Nagahama Bay, Satsuma Iwojima Island, Kagoshima, Japan.2010
Author(s)
Tomoaki Nagatal, Kiyokawa, S., Sakamoto, R., Takehara, M., Ikehara, M., Oguri, K., Goto, S., Ito, T., Yamaguchi, K.E.
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Journal Title
Geological Survey of Western Australia, Record
Volume: 18
Pages: 378-379
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[Journal Article] Reconstruction of 3.2 Ga ocean floor environment from cores of DXCK Drilling Project, Pilbara, Western Australia. Results of stratigraphic analysis and sulfur isotope analysis.2010
Author(s)
Sakamoto, R., Kiyokawa, S., Ito, T., Ikehara, M., Naraoka, H., Yamaguchi, K.E., Suganuma, Y.
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Journal Title
Geological Survey of Western Australia, Record
Volume: 18
Pages: 398-400
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[Presentation] Molybdenum Enrichment in the 3.2 Ga old Black Shales Recovered by Dixon Island-Cleaverville Drilling Project (DXCL-DP) in Northwestern Pilbara, Western Australia.2010
Author(s)
Yamaguchi, K.E., Kiyokawa, S., Naraoka, H., Ikehara, M., Ito, T., Suganuma, Y., Sakamoto, R., Hosoi, K.
Organizer
American Geophysical Union, Fall Meeting
Place of Presentation
San Francisco, CA, USA
Year and Date
2010-12-16
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[Presentation] Sedimentary environment of 3.2 Ga Dixon Island and Cleaverville Formations : Results of DXCL-Drilling, West Pilbara, Australia.2010
Author(s)
Kiyokawa, S., Ito, T., Ikehara, M., Yamaguchi, K.E., Naraoka, H., Sakamoto, R., Hosoi, K., Suganuma, Y.
Organizer
American Geophysical Union, Fall Meeting
Place of Presentation
San Francisco, CA, USA
Year and Date
2010-12-16
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[Presentation] Reconstruction of 3.2 Ga ocean floor environment form cores DXCL drilling project, Pilbara, Western Australia.2010
Author(s)
Sakamoto, R., Kiyokawa, S., Ito, T., Ikehara, M., Naraoka, H., Yamaguchi, K.E., Suganuma, Y.
Organizer
American Geophysical Union, Fall Meeting
Place of Presentation
San Francisco, CA, USA
Year and Date
2010-12-16
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[Presentation] Ferric Fe precipitation in the Nagahama Bay, Satsuma Iwo-Jima Island, Kagoshima2010
Author(s)
Nagata, T., Kiyokawa, S., Ikehara, M., Oguri, K., Goto, S., Ito, T., Ueshiba, T., Yamaguchi, K.E.
Organizer
American Geophysical Union, Fall Meeting
Place of Presentation
San Francisco, CA, USA
Year and Date
2010-12-16
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[Presentation] Modem anaerobic phototrophic ecosystems and "bacterial plate" in a meromictic Lake Kai-ike, southwest Japan : Biogeochemical cycling of Fe and S.2010
Author(s)
Yamaguchi, K.E., Oguri, K., Kakegawa, T., Johnson, C.M., Beard, B.L.
Organizer
Anaerobic Phototrophic Ecosystems
Place of Presentation
Fayetteville NY, USA
Year and Date
2010-10-11
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[Presentation] Enrichment of molybdenum in Mesoarchean black shales : A preliminary result of DXCL-DP (Dixon Island-Cleaverville Drilling Project), Pilbara, Western Australia.2010
Author(s)
Yamaguchi, K.E., Sakamoto, R., Hosoi, K., Kiyokawa, S., Naraoka, H., Ikehara, M., Ito, T.
Organizer
5^<th> International Archean Symposium (5IAS)
Place of Presentation
Perth, Australia
Year and Date
2010-09-08
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[Presentation] Mesoarchean hydrothermal oceanic sedimentation and environment : DXCL-Drilling West Pilbara, Australia.2010
Author(s)
Kiyokawa, S., Ito, T., Ikehara, M., Yamaguchi, K.E., Naraoka, H., Sakamoto, R., Koge, S., Hosoi, K., Suganuma, Y.
Organizer
5^<th> International Archean Symposium (5IAS)
Place of Presentation
Perth, Australia
Year and Date
2010-09-08
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[Presentation] Reconstruction of 3.2 Ga ocean floor environment from cores of DXCK Drilling Project, Pilbara, Western Australia. Results of strtigraphic analysis and sulfur isotope analysis.2010
Author(s)
Sakamoto, R., Kiyokawa, S., Ito, T., Ikehara, M., Naraoka, H., Yamaguchi, K.E., Suganuma, Y.
Organizer
5^<th> International Archean Symposium (5IAS)
Place of Presentation
Perth, Australia
Year and Date
2010-09-08
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[Presentation] Hydrothermal activity and iron sedimentation in Nagahama Bay, Satsuma Iwojima Island, Kagoshima2010
Author(s)
Nagata, T., Kiyokawa, S., Sakamoto, R., Takehara, M., Ikehara, M., Oguri, K., Goto, S., Ito, T., Yamaguchi, K.E.
Organizer
5^<th> International Archean Symposium (5IAS)
Place of Presentation
Perth, Australia
Year and Date
2010-09-08
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[Presentation] Discovery of 3.2 billion-years-old sulfidic black shales : A progress report of the Dixon Island-Cleaverville Drilling Project (DXCL-DP) in the Pilbara Craton, Western Australia2010
Author(s)
Yamaguchi, K.E., Kiyokawa, S., Ito, T., Ikehara, M.
Organizer
Astrobiology Science Conference (AbSciCon) 2010
Place of Presentation
League City, TX, USA
Year and Date
2010-04-28
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[Presentation] Iron and carbon isotope evidence for ecosystem and environmental diversity in the ~2.7 to 2.5 Ga Hamersley Province, Western Australia.2010
Author(s)
Czaja, A.D., Johnson, C.M., Beard, B.L., Eigenbrode, J.L., Freeman, K.H., Yamaguchi, K.E.
Organizer
Astrobiology Science Conference (AbSciCon) 2010
Place of Presentation
League City, TX, USA
Year and Date
2010-04-28
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