A study on ocean Neutralization

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400488
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Ehime University
• Principal Investigator: Rie S. HORI 愛媛大学, 理工学研究科, 教授 (30263924)
• Co-Investigator(Kenkyū-buntansha): KODAMA Kazuto 高知大学, 教育研究部, 教授 (00153560)
• Research Collaborator: IKEDA Masayuki 静岡大学, 理学研究科, 助教 ; ABRAJEVITCH Alexandra ロシア科学アカデミー テクトニクス, 地球物理研究所, Research Scientist
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 海洋酸性化 / T-J境界 / 中和 / 大量絶滅 / 放散虫

Outline of Final Research Achievements

Multidisciplinary research has been performed on the pelagic sequences of Triassic-Jurassic boundary from the Inuyama, Mino Belt and Akehama, Chichibu Belt, Japan, from the Waipapa Belt, N.Z. and Antalya, Turkey, in order to clarify the meditation process from oceanic acidification event. The results of this study suggest that oceanic neutralization, indicating by extraordinary compositions of sediments such as Ca rich, occurred after acidification, and then faunal turnover of microfossils such as radiolarians continuously happened in a short duration <100kyr. This phenomenon strongly linked to the end Triassic mass extinctions suggested by a negative peak of stable Carbon isotopic ratios and also decreasing of biogenic magnetite in sediments.

Free Research Field

層序学