Isotopic compositions of brachiopod shells. Toward a definitive understanding ofδ^<13> C andδ^<18> O evolution of Phanerozoic seawater

2011 Fiscal Year Final Research Report

• Project/Area Number: 21340152
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Nagoya University
• Principal Investigator: IRYU Yasufumi 名古屋大学, 環境学研究科, 教授 (00250671)
• Co-Investigator(Kenkyū-buntansha): KITAGAWA Hiroyuki 名古屋大学, 環境学研究科, 教授 (00234245) ; OTAKE Tsuguo 東京大学, 大気海洋研究所, 教授 (20160525)
• Project Period (FY): 2009 – 2011
• Keywords: 腕足動物 / 炭素同位体 / 酸素同位体 / 個体差 / 顕生代

Research Abstract

This study examines inter-and intraspecific variations in carbon-and oxygen-isotope compositions(.^<13> C and.^<18> O) of modern brachiopod shells to establish sound basis to use the.^<13> C and.^<18> O values of fossil brachiopods as proxies for.^<13> C values of dissolved inorganic carbon and seawater temperature and/or.^<18> O values(.^<18> OSW). Interspecific variations in.^<13> C and.^<18> O values of six modern-brachiopod species collected from a subtropical to cool-temperate environments showed that the degree of the vital effect is highly variable among species. Intraspecific variation in.^<13> C and.^<18> O values of two modern-brachiopod species(9 and 8 specimens of Basiliola lucida and Terebratulina crossei, respectively) demonstrated that.^<13> C and.^<18> O values of some shell portions show small variations and are identical or close to those of calcite precipitated in isotopic equilibrium with the surrounding seawater. Such portions are useful to reliably reconstruct ancient ocean environments.

Research Products

• [Journal Article] Brachiopod taxa and shell portions reliably recording past ocean environments : Toward establishing a robust paleoceanographic proxy (2011)
  • Author(s): Yamamoto, K., Asami, R. and Iryu, Y.
  • Journal Title: Geophysical Research Letters Volume: Vol.38 Pages: 13601
  • DOI: DOI:10.1029/2011GL047134.
  • Peer Reviewed
• [Journal Article] Carbon and oxygen isotopic compositions of modern brachiopod shells from a warm-temperate shelf environment, Sagami Bay, central Japan (2010)
  • Author(s): Yamamoto, K., Asami, R. and Iryu, Y.
  • Journal Title: Palaeogeography, Palaeoclimatology, Palaeoecology Pages: 348-359
  • DOI: DOI:10.1016/j.palaeo.2010.03.006.
  • Peer Reviewed
• [Journal Article] Within-shell variations in carbon and oxygen isotopic compositions of two modern brachiopods from a subtropical shelf environment off Amami-o-shima, southwestern Japan (2010)
  • Author(s): Yamamoto, K., Asami, R. and Iryu, Y.
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: Vol.19 Pages: 10009
  • DOI: doi:10.1029/2010GC003190.
  • Peer Reviewed
• [Presentation] Intraspecific variations in carbon and oxygen isotope compositions of the modern brachiopod (2011)
  • Author(s): Takayanagi, H., Asami, R., Otake, F., Abe, O., Kitagawa, H., and Iryu, Y.
  • Organizer: 日本地球惑星科学連合2011年大会
  • Place of Presentation: 幕張
  • Year and Date: 20110520-25
• [Presentation] 腕足動物Terebratulina crossesはどの程度正確に海洋環境を記録しているか? (2011)
  • Author(s): 高柳栄子・浅海竜司・大竹二雄・阿部理・北川浩之・井龍康文
  • Organizer: 日本古生物学会第160回例会
  • Place of Presentation: 高知(高知大学)
  • Year and Date: 20110128-30
• [Presentation] 粟国島沖(水深606m)より採取された現生腕足動物の殻の炭素・酸素同位体組成 (2011)
  • Author(s): 高柳栄子・浅海竜司・阿部理・宮島利宏・北川浩之・井龍康文
  • Organizer: 東京大学大気海洋研究所共同利用研究集会バイオミネラリゼーションと石灰化.遺伝子から地球環境までー
  • Place of Presentation: 東京大学大気海洋研究所
  • Year and Date: 2011-11-18
• [Presentation] 腕足動物殻の炭素・酸素同位体組成はどの程度正確な古環境指標となりうるのか (2011)
  • Author(s): 高柳栄子・浅海竜司・大竹二雄・阿部理・北川浩之・井龍康文
  • Organizer: 東大大気海洋研研究集会
  • Place of Presentation: 東大大気海洋研研究集会
  • Year and Date: 2011-02-10
• [Presentation] Basiliola lucidaの炭素・酸素同位体組成の地域差に関する研究 (2011)
  • Author(s): 高柳栄子・浅海竜司・大竹二雄・阿部理・北川浩之・井龍康文
  • Organizer: 東大大気海洋研共同利用研究集会「2010年度古海洋シンポジウム」
  • Place of Presentation: 柏(東京大学大気海洋研究所)
  • Year and Date: 2011-01-07
• [Presentation] 岩手県大槌湾より採取した現生腕足動物Terebratulina crosseiの殻の炭素・酸素同位体組成の個体差 (2010)
  • Author(s): 高柳栄子・浅海竜司・大竹二雄・阿部理・北川浩之・井龍康文
  • Organizer: 日本地質学会第117年学術大会
  • Place of Presentation: 富山(富山大学)
  • Year and Date: 20100918-20
• [Presentation] 暖温帯陸棚海域から採取された現生腕足動物殻の炭素・酸素同位体比組成 (2009)
  • Author(s): 井龍康文・山本和幸・浅海竜司
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張
  • Year and Date: 2009-05-19
• [Book] Proceedings of the Integrated Ocean Drilling Program (2011)
  • Author(s): Webster, J. M., Yokoyama, Y., Cotterill, C., and the Expedition 325 Scientists
  • Publisher: Integrated Ocean Drilling Program Management International
• [Book] The Last Deglacial Sea Level Rise in the South Pacific : Offshore Drilling Northeast Australia (2010)
  • Total Pages: 127
  • URL: http://publications.iodp.org/preliminary_report/325/