Understanding magnetic mineral diagenesis in the methane-rich sediments from Nankai Trough

• Project/Area Number: 17K05681
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Kochi University
• Principal Investigator: KARS Myriam 高知大学, 教育研究部総合科学系複合領域科学部門, 助教 (90725706)
• Co-Investigator(Kenkyū-buntansha): 小玉 一人 同志社大学, 研究開発推進機構, 嘱託研究員 (00153560)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: magnetic diagenesis / iron cycle / microbial activity / magnetic minerals / Nankai Trough / Diagenesis / Iron sulfides / Methane / diagenesis / iron sulfides / methane / sulfidic zone

Outline of Final Research Achievements

The research funded by a Scientific Research（C）has led to the publications of two major papers in international journals in open access. Data are available on free online data repository. Numerous scientific communications in international and domestic conferences were given by the PI and co-investigators.
Additional data are going to be published in data report, available online (open access)

Academic Significance and Societal Importance of the Research Achievements

この研究は、鉄と硫黄の循環に新しい洞察をもたらします。 特に鉄の循環は微生物の生命（活動）にとって非常に重要です。 調査されたサイトは、生命の温度限界に近い、高温環境の地下生物圏を対象としていました。
公開された論文は、エネルギーが制限された環境での微生物の活動と、炭素循環（炭素の放出と貯蔵）におけるその役割に関する知識のマイルストーンです。

Research Products

• [Int'l Joint Research] Alfred Wegener Institute(ドイツ)
• [Int'l Joint Research] ANU Canberra(オーストラリア)
• [Int'l Joint Research] AWI Bremerhaven/MARUM University of Bremen(ドイツ)
• [Int'l Joint Research] Alfred Wegener Institute Bremerhaven/MARUM University of Bremen(ドイツ)
• [Int'l Joint Research] Alfred Wegener Institute Bremerhaven/MARUM University of Bremen(Germany)
• [Journal Article] volution of (Bio-)geochemical Processes and Diagenetic Alteration of Sediments Along the Tectonic Migration of Ocean Floor in the Shikoku Basin off Japan (2021)
  • Author(s): Koester, M., M. Kars, F. Schubotz, M-Y. Tsang, M. Maisch, A. Kappler, Y. Morono, F. Inagaki, V. B. Heuer, S. Kasten, and S. Henkel
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 22 Issue: 8
  • DOI: 10.1029/2020gc009585
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Influence of Early Low-Temperature and Later High-Temperature Diagenesis on Magnetic Mineral Assemblages in Marine Sediments from the Nankai Trough (2021)
  • Author(s): Kars M., M. Koester, S. Henkel, R. Stein, F. Schubotz, X. Zhao, S. A. Bowden, A. P. Roberts, K. Kodama
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 22 Issue: 10
  • DOI: 10.1029/2021gc010133
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] The influence of tectonic migration of ocean floor on (bio-)geochemical and diagenetic processes in subseafloor sediments from the Nankai Trough off Japan (2021)
  • Author(s): Koester, M., M. Kars, F. Schubotz, M-Y. Tsang, Y. Morono, F. Inagaki, V.B. Heuer, S. Kasten, and S. Henkel
  • Organizer: EGU General Assembly 2021
• [Presentation] Early low-temperature and later high-temperature diagenetic processes and their influence on magnetic mineral assemblages in marine sediments from IODP Site C0023, Nankai Trough, Northwestern Pacific Ocean (2021)
  • Author(s): Kars, M., M. Koester, S. Henkel, S. A. Bowden, X. Zhao, and A. P. Roberts
  • Organizer: Joint Scientific Assembly IAGA-IASPEI 2021
  • Invited
• [Presentation] Paleomagnetic and rock magnetic investigation in marine sediments, Nankai Trough, offshore Cape Muroto (2020)
  • Author(s): Myriam Kars, Tetsuya Fukuta, Carina Becker
  • Organizer: EGU
• [Presentation] Characterization of complex magnetic mineral assemblages in Nankai Trough sediments, off Japan (IODP Expedition 370) (2018)
  • Author(s): Myriam Kars, Andrew P. Roberts, Xiang Zhao
  • Organizer: AGU Fall Meeting 2018
• [Presentation] Investigating the effects of high temperature and a deep SMTZ on rock magnetic properties at Site C0023, IODP Expedition 370 (2017)
  • Author(s): Myriam Kars, Susann Henkel, Natsumi Okutsu, IODP Expedition 370 Scientists
  • Organizer: Goldschmidt Conference
• [Presentation] Investigating the effects of high temperature and a deep SMTZ at Site C0023, IODP Expedition 370 (2017)
  • Author(s): Myriam Kars, Susann Henkel, IODP Expedition 370 Scientists
  • Organizer: AGU Fall meeting