Investigation of stromatolite formation by chemosynthetic microbes

• Project/Area Number: 15H05468
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Stratigraphy/Paleontology
• Research Institution: Kochi University (2017); Japan Agency for Marine-Earth Science and Technology (2015-2016)
• Principal Investigator: Okumura Tomoyo 高知大学, 海洋コア総合研究センター, 特任助教 (90750000)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000); Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2016: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2015: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
• Keywords: ストロマトライト / シアノバクテリア / 化学合成微生物 / 深海 / 蛇紋岩化作用 / 炭酸塩 / ブルーサイト / 蛇紋岩湧水 / 古生態 / 化学合成 / チムニー

Outline of Final Research Achievements

Stromatolite is one of abundant fossil record in Precambrian Era, and thought to be formed by association with cyanobacteria. However its formation processes are still unknown because of some counter-examples. This study showed that stromatolitic textures were formed within deep-sea chimneys by association with chemosynthetic microbes. Biogeochemical dataset such as sedimentary texture, mineralogy, stable isotope characteristics, chronology, and microbial composition and distributions could be useful information for reinterpretation of fossil stromatolites.

Research Products

• [Int'l Joint Research] 台湾国立大学(台湾)
• [Int'l Joint Research] University of Texas/Oregon State University/University of Hawaii(米国)
• [Int'l Joint Research] University of Texas/Oregon State University/University of Hawaii(米国)
• [Int'l Joint Research] National Taiwan University(台湾)
• [Journal Article] Brucite chimney formation and carbonate alteration at the Shinkai Seep Field, a serpentinite-hosted vent system in the Southern Mariana Forearc. (2016)
  • Author(s): Okumura, T., Ohara, Y., Stern, R. J., Yamanaka, T., Onishi, Y., Watanabe, H., Chen, C., Bloomer, S. H., Pujana, I., Sakai, S., Ishii, T., Takai, K.
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 17 Issue: 9 Pages: 3775-3796
  • DOI: 10.1002/2016gc006449
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Transition of microbiological and sedimentological features associated with the geochemical gradient in a travertine mound in northern Sumatra, Indonesia (2016)
  • Author(s): Sugihara, C., Yanagawa, K., Okumura, T., Takashima, C., Harijoko, A., Kano, A.
  • Journal Title: Sedimentary Geology Volume: 343 Pages: 85-98
  • DOI: 10.1016/j.sedgeo.2016.07.012
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Hydrogen and carbon isotope systematics in hydrogenotrophic methanogenesis under H2-limited and -enriched conditions: Implications for the origin of methane and its isotopic diagnosis. (2016)
  • Author(s): Okumura T., Kawagucci S., Saito Y., Matsui Y., Takai K., Imachi H.
  • Journal Title: Progress in Earth and Planetary Science. Volume: 3 Issue: 1 Pages: 14-14
  • DOI: 10.1186/s40645-016-0088-3
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Microbial community in brucite-carbonate chimneys discovered in the Shinkai Seep Field, the deepest serpentinite-hosted vent system in the Southern Mariana Forearc. (2017)
  • Author(s): 奥村知世・平井美穂・布浦拓郎・高井研・小原泰彦
  • Organizer: 日本地球惑星科学関連合2017年大会
• [Presentation] Expeditions to the world’s deepest serpentinite-hosted seep system, the Shinkai Seep Fields, the southern Mariana forearc (2017)
  • Author(s): 小原泰彦・ 奥村知世・ Robert, J. Stern・大西雄二・大家翔馬・渡部裕美・山中寿朗・藤井昌和・Fernando Martinez・石井輝秋・道林克禎・高井研・Science party for the Shinkai Seep expeditions
  • Organizer: 日本地球惑星科学関連合2017年大会
• [Presentation] しんかい湧水域で発達するチムニーの微生物群衆組成とその多様性 (2017)
  • Author(s): 奥村知世・高井研・平井美穂・布浦拓郎・高木喜弘・砂村倫成・小原泰彦
  • Organizer: InterRedge-Japan研究集会
• [Presentation] Comprehensive understanding of the Shinkai Seep Field in the Southern Mariana Forearc based on high-resolution bathymetry data. (2016)
  • Author(s): Ohara, Y., Okumura, T., Stern, R. J., Fujii, M., Kasaya, T., Martines, F., Michibayashi, K.
  • Organizer: American Geophysical Union Fall meeting 2016
  • Place of Presentation: アメリカ合衆国、サンフランシスコ、Moscone Center
  • Year and Date: 2016-12-15
  • Int'l Joint Research
• [Presentation] Brucite chimney formation and carbonate alteration at the Shinkai Seep Field, a serpentinite-hosted vent system in the Southern Mariana Forearc. (2016)
  • Author(s): Okumura, T., Ohara, Y., Stern, R. J., Yamanaka, T., Onishi, Y., Watanabe, H., Chen, C., Bloomer, S. H., Pujana, I., Sakai, S., Ishii, T., Takai, K.
  • Organizer: American Geophysical Union Fall meeting 2016
  • Place of Presentation: アメリカ合衆国、サンフランシスコ、Moscone Center
  • Year and Date: 2016-12-14
  • Int'l Joint Research
• [Presentation] Daily lamination formed by sulfur oxidizing bacteria and chloroflexus in a hot spring stromatolite (2016)
  • Author(s): Okumura, T., Takashima, C., Yanagawa, K., Sugihara, C., Harijoko, A. and Kano, A.
  • Organizer: 35th International geological congress
  • Place of Presentation: 南アフリカ共和国、ケープタウン、ケープタウン国際コンベンションセンター
  • Year and Date: 2016-08-31
  • Int'l Joint Research
• [Presentation] Isotope systematics of CO2-H2-H2O-CH4 in hydrogenotrophic methanogenesis examined by laboratory incubation (2016)
  • Author(s): Kawagucci, S., Okumura, T., Saito, Y., Matsui, Y., Takai, K., Imachi, H.
  • Organizer: Goldschmidt 2016
  • Place of Presentation: 神奈川県、横浜、パシフィコ横浜
  • Year and Date: 2016-06-30
  • Int'l Joint Research
• [Presentation] 化学合成生態系で発達するマイクロバイアライト (2016)
  • Author(s): 奥村知世
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ、千葉市、千葉県
  • Year and Date: 2016-05-26
  • Invited
• [Presentation] メタン生成古細菌を培養し微生物起源メタンが呈する炭素・水素安定同位体比の特徴を明らかにした上でこれを文献値と比較したところ一致しなかった (2015)
  • Author(s): 川口慎介・奥村知世・齊藤弥生・松井洋平・高井研・井町寛之
  • Organizer: 日本地球化学会第62回年会
  • Place of Presentation: 横浜国立大学、横浜市、神奈川県
  • Year and Date: 2015-09-17
• [Presentation] 南部マリアナ前弧しんかいシープで発達するチムニーの鉱物組成と堆積組織 (2015)
  • Author(s): 奥村知世・石井輝秋・小原泰彦 ・高井研・YK13-08 及び YK14-13 乗船研究者一同
  • Organizer: 日本地質学会第122年学術大会
  • Place of Presentation: 信州大学、長野市、長野県
  • Year and Date: 2015-09-12
• [Presentation] トラバーチンにみられる微生物分帯：スマトラ島北部の例 (2015)
  • Author(s): 杉原千耶・柳川勝紀・狩野彰宏・高島千鶴・奥村知世・Agung Harijoko
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ、千葉市、千葉県
  • Year and Date: 2015-05-26