Deciphering surface environment in the late Proterozoic using Re-Os measurement.

• Project/Area Number: 24840021
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Geology
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: SAWAKI Yusuke 東京工業大学, 理工学研究科, 助教 (00635063)
• Project Period (FY): 2012-08-31 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 後期原生代 / レニウム・オスミウム / Sulfidic / 南中国三峡地域 / 南中国 / ReOsアイソクロン / 黒色頁岩

Research Abstract

Global correlation of Precambrian stratigraphic successions can be conducted by the coarse resolution off biostratigraphic and chemostratigraphic records, because of the scarcity of precise U-Pb zircon dating. Re-Os isotope systems of organic matter-rich black shales became one of the reliable indicators of the depositional age, due to the recent developments in Re-Os analysis.
Rock powders were prepared from drill-core collected at Three Gorge, South China. Re and Os isotopic compositions were measured by TIMS at JAMSTEC. The 187Re/188Os and 187Os/188Os ratios of the black shales show linearity in the isochron plot. The model 3 isochron ages were 578 Ma (error is 12 Ma) for the black shale at the lower Member 4 of the Doushantuo Fm, with initial 187Os/188Os ratios of 1.02 (2SD=0.09). The Re-Os isochron plot for all analyses yields an age of 512 (error is 12 Ma) for the black shale at the bottom of the Shuijingtuo Fm, with initial 187Os/188Os ratios of 1.15 (2SD=0.19).

Research Products

• [Journal Article] The anomalous Ca cycle in the Ediacaran ocean : evidence from Ca isotopes preserved in carbonates in the Three Gorges area, South China (2014)
  • Author(s): Y Sawaki, 他7名
  • Journal Title: Gondwana Research Volume: 25 Pages: 1070-1089
  • Peer Reviewed
• [Journal Article] Initiation of leaking Earth : An ultimate trigger of the Cambrian explosion (2014)
  • Author(s): S Maruyama, Y Sawaki, 他4名
  • Journal Title: Gondwana Research Volume: 25 Pages: 910-944
  • Peer Reviewed
• [Journal Article] The Cambrian Explosion : Plume-driven birth of the second ecosystem on Earth (2014)
  • Author(s): M Santosh, Y Sawaki, 他2名
  • Journal Title: Gondwana Research Volume: 25 Pages: 945-965
  • Peer Reviewed
• [Journal Article] New chronological constraints for Cryogenian to Cambrian rocks in the Three Gorges, Weng'an and Chengjiang areas, South China (2014)
  • Author(s): Y Okada, Y Sawaki, 他6名
  • Journal Title: Gondwana Research Volume: 25 Pages: 1027-1044
  • Peer Reviewed
• [Journal Article] Nitrogen isotope chemostratigraphy of the Ediacaran and Early Cambrian platform sequence at Three Gorges, South China (2014)
  • Author(s): R Kikumoto, Y Sawaki , 他6名
  • Journal Title: Gondwana Research Volume: 25 Pages: 1057-1069
  • Peer Reviewed
• [Journal Article] In-situ analyses of phosphorus contents of carbonate minerals : Reconstruction of phosphorus contents of seawater from the Ediacaran to early Cambrian (2014)
  • Author(s): T Shimura, Y Sawaki, 他5名
  • Journal Title: Gondwana Research Volume: 25 Pages: 1090-1107
  • Peer Reviewed
• [Journal Article] The anomalous Ca cycle in the Ediacaran ocean: evidence from Ca isotopes preserved in carbonates in the Three Gorges area, South China (2014)
  • Author(s): Y. Sawaki, M. Tahata, T. Ohno, T. Komiya, T. Hirata, S. Maruyama, J. Han, D. Shu
  • Journal Title: Gondwana Research Volume: 25 Issue: 3 Pages: 1070-1089
  • DOI: 10.1016/j.gr.2013.03.008
  • Peer Reviewed
• [Journal Article] The Cambrian Explosion: Plume-driven birth of the second ecosystem on Earth (2014)
  • Author(s): Santosh, M., Maruyama, S., Sawaki, Y., Meert, J. G.
  • Journal Title: Gondwana Research Volume: 25 Issue: 3 Pages: 945-965
  • DOI: 10.1016/j.gr.2013.03.013
  • Peer Reviewed
• [Journal Article] New chronological constraints for Cryogenian to Cambrian rocks in the Three Gorges, Weng’an and Chengjiang areas, South China (2014)
  • Author(s): Okada, Y., Sawaki, Y., Komiya, T., Hirata, T., Takahata, N., Sano, Y., Han, J., Maruyama, S.
  • Journal Title: Gondwana Research Volume: 25 Issue: 3 Pages: 1027-1044
  • DOI: 10.1016/j.gr.2013.05.001
  • Peer Reviewed
• [Journal Article] In-situ analyses of phosphorus contents of carbonate minerals: Reconstruction of phosphorus contents of seawater from the Ediacaran to early Cambrian (2014)
  • Author(s): Shimura, T., Kon, Y., Sawaki, Y., Hirata, T., Han, J., Shu, D., Komiya, K.
  • Journal Title: Gondwana Research Volume: 25 Issue: 3 Pages: 1090-1107
  • DOI: 10.1016/j.gr.2013.08.001
  • Peer Reviewed
• [Journal Article] Zircon U-Pb dating from the mafic enclaves in the Tanzawa Tonalitic Pluton, Japan: Implications for arc history and formation age of the lower-crust (2014)
  • Author(s): Suzuki, K., Yamamoto, S., Sawaki, Y., Aoki, K., Omori, S., Kon, Y., Hirata, T., Li, Y., Takaya, Y., Fujinaga, K., Kato, Y., Maruyama, S.
  • Journal Title: Lithos Volume: 196-197 Pages: 301-320
  • DOI: 10.1016/j.lithos.2014.02.010
  • Peer Reviewed / Open Access
• [Journal Article] Accreted Kula plate fragment at 94 Ma in the Yokonami-melange, Shimanto-belt, Shikoku, Japan (2014)
  • Author(s): Saito, T., Okada, Y., Fujisaki, W., Sawaki, Y., Sakata, S., Dohm, J., Maruyama, S., Hirata, T.
  • Journal Title: Tectonophysics Volume: 623 Pages: 136-146
  • DOI: 10.1016/j.tecto.2014.03.026
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Carbon and oxygen isotope chemostratigraphies of the Yangtze platform, South China : Decoding temperature and environmental changes through the Ediacaran (2013)
  • Author(s): M Tahata, Y Sawaki, 他9名
  • Journal Title: Gondwana Research Volume: 23 Pages: 333-353
  • Peer Reviewed
• [Journal Article] Chemical composition and K–Ar age of Phengite from Barrovian metapelites, Loch Leven, Scotland (2013)
  • Author(s): K Aoki, Y Sawaki, 他7名
  • Journal Title: The Journal of the Geological Society of Japan Volume: 119 Pages: 437-442
  • NAID: 130004756747
  • Peer Reviewed
• [Journal Article] Initiation of leaking Earth: An ultimate trigger of the Cambrian explosion (2013)
  • Author(s): Maruyama, S., Sawaki, Y., Ebisuzaki, T., Ikoma, M., Omori, S., Komabayashi, T.
  • Journal Title: Gondwana Research Volume: 25 Issue: 3 Pages: 910-944
  • DOI: 10.1016/j.gr.2013.03.012
  • Peer Reviewed
• [Journal Article] The anomalous Ca cycle in the Ediacaran ocean: evidence from Ca isotopes preserved in carbonates in the Three Gorges area, South China (2013)
  • Author(s): Yusuke Sawaki
  • Journal Title: Gondwana Research Volume: in press
  • Peer Reviewed
• [Journal Article] Carbon and oxygen isotope chemostratigraphies of the Yangtze platform, South China: Decoding temperature and environmental changes through the Ediacaran. (2013)
  • Author(s): Miyuki Tahata
  • Journal Title: Gondwana Research Volume: 23 Pages: 333-353
  • Peer Reviewed
• [Journal Article] Chemical composition and K–Ar age of Phengite from Barrovian metapelites, Loch Leven, Scotland (2013)
  • Author(s): Kazumasa Aoki
  • Journal Title: The Journal of the Geological Society of Japan Volume: in press
  • Peer Reviewed
• [Journal Article] Initiation of leaking Earth: An ultimate trigger of the Cambrian explosion (2013)
  • Author(s): Shigenori Maruyama
  • Journal Title: Gondwana Research Volume: in press
  • Peer Reviewed
• [Journal Article] The Cambrian Explosion: Plume-driven birth of the second ecosystem on Earth (2013)
  • Author(s): M. Santosh
  • Journal Title: Gondwana Research Volume: in press
  • Peer Reviewed
• [Journal Article] Depth variation of carbon and oxygen isotopes of calcites in Archean altered upper oceanic crust in the Archean (2012)
  • Author(s): T Shibuya, Y Sawaki, 他10名
  • Journal Title: Earth and Planetary Science Letters Volume: 321-322 Pages: 64-73
  • Peer Reviewed
• [Journal Article] In situ iron isotope analyses of pyrite and organic carbon isotope ratios in the Fortescue Group : Metabolic variations of a Late Archean ecosystem (2012)
  • Author(s): K Yoshiya, Y Sawaki, 他8名
  • Journal Title: Precambrian Research Volume: 212-213 Pages: 169-193
  • Peer Reviewed
• [Journal Article] エディアカラ紀ーカンブリア紀の地球表層環境変化 (2012)
  • Author(s): 澤木佑介
  • Journal Title: 生物の科学遺伝 Volume: 66 Pages: 502-508
• [Journal Article] In situ iron isotope analyses of pyrite and organic carbon isotope ratios in the Fortescue Group: Metabolic variations of a Late Archean ecosystem. (2012)
  • Author(s): Kazumi Yoshiya
  • Journal Title: Precambrian Research Volume: 212-213 Pages: 169-193
  • Peer Reviewed
• [Journal Article] Depth variation of carbon and oxygen isotopes of calcites in Archean altered upper oceanic crust in the Archean. (2012)
  • Author(s): Takazo Shibuya
  • Journal Title: Earth and Planetary Science Letters Volume: 321-322 Pages: 169-193
  • Peer Reviewed
• [Journal Article] エディアカラ紀ーカンブリア紀の地球表層環境変化 (2012)
  • Author(s): 澤木佑介
  • Journal Title: 生物の科学 遺伝 Volume: 66(5) Pages: 502-508
• [Journal Article] Zircon U–Pb dating from the mafic enclaves in the Tanzawa Tonalitic Pluton, Japan : Implications for arc history and formation age of the lower-crust
  • Author(s): K Suzuki, Y Sawaki, 他10名
  • Journal Title: Lithos Volume: (in press)
  • Peer Reviewed
• [Journal Article] Accreted Kula plate fragment at 94 Ma in the Yokonami-Melange, Shimanto-Belt, Shikoku, Japan
  • Author(s): T Saito, Y Sawaki, 他6名
  • Journal Title: Tectonophysics Volume: (in press)
  • Peer Reviewed
• [Presentation] Oxic ocean in the late Ediacaran and early Cambrian (2013)
  • Author(s): 澤木佑介, 他6名
  • Organizer: 日本地質学会第120年学術大会
  • Place of Presentation: 東北大学 (仙台)
  • Year and Date: 2013-09-15
• [Presentation] Intensive continental weathering rate in the Lower Cambrian : evidenced from Sr isotope ratios preserved in the strata at the Three Gorges (2013)
  • Author(s): 澤木佑介, 他2名
  • Organizer: 日本地球惑星科学連合2013年大会
  • Place of Presentation: 幕張メッセ (千葉)
  • Year and Date: 2013-05-19
• [Presentation] Intensive continental weathering rate in the Lower Cambrian: evidenced from Sr isotope ratios preserved in the strata at the Three Gorges (2013)
  • Author(s): 澤木佑介、小宮剛、丸山茂徳
  • Organizer: 日本地球惑星科学連合2013年大会
  • Place of Presentation: 幕張メッセ(千葉)
• [Presentation] Oxic ocean in the late Ediacaran and early Cambrian (2013)
  • Author(s): 澤木佑介、野崎達生、仙田量子、鈴木勝彦、小宮 剛
  • Organizer: 日本地質学会第120年学術大会
  • Place of Presentation: 東北大学(仙台)
• [Presentation] Petro-genesis of Mn-ore in the Neoproterozoic (2012)
  • Author(s): 澤木佑介, 他4名
  • Organizer: 日本地質学会第119年学術大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2012-09-15
• [Presentation] The ferruginous ocean in the Ediacaran; evidence from iron isotope ratios in pyrite (2012)
  • Author(s): 澤木佑介, 他6名
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 幕張メッセ (千葉)
  • Year and Date: 2012-05-24
• [Presentation] The stepwise surface environmental changes during the Ediacaran and Cambrian (2012)
  • Author(s): 澤木佑介, 丸山茂徳
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 幕張メッセ (千葉)
  • Year and Date: 2012-05-21
• [Presentation] Petro-genesis of Mn-ore in the Neoproterozoic. (2012)
  • Author(s): 澤木佑介
  • Organizer: 日本地質学会第119年学術大会
  • Place of Presentation: 大阪府立大学(大阪府)
• [Presentation] カナダ・ラブラドル地域(3.8Ga)の地質とジルコン年代 (2012)
  • Author(s): 下條将徳
  • Organizer: 日本地質学会第119年学術大会
  • Place of Presentation: 大阪府立大学(大阪府)
• [Presentation] 初期太古代Labrador地域Nulliak表成岩中の縞状鉄鉱層、炭酸塩岩、チャートの産状と地球化学的研究 (2012)
  • Author(s): 青木翔吾
  • Organizer: 日本地質学会第119年学術大会
  • Place of Presentation: 大阪府立大学(大阪府)
• [Remarks] 東京工業大学ホームページ
  • URL: http://t2r2.star.titech.ac.jp/cgi-bin/researcherinfo.cgi?q_researcher_content_number=CTT100511199
• [Remarks] 海洋研究開発機構ホームページ
  • URL: http://www.jamstec.go.jp/personal/003342.html