Study on the formation of large oncoids in the Early Permian and their relation with the Panthalassan superplume

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400503
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Nakazawa Tsutomu 国立研究開発法人産業技術総合研究所, 地質情報研究部門, 研究グループ長 (50357620)
• Co-Investigator(Kenkyū-buntansha): UENO Katsumi 福岡大学, 理学部, 教授 (90241786) ; KAWAHATA Hodaka 東京大学, 大気海洋研究所, 教授 (20356851)
• Co-Investigator(Renkei-kenkyūsha): OKAI Takashi 独立行政法人産業技術総合研究所, 地質情報研究部門, 研究グループ長 (20356679)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 造礁生物群集 / ペルム紀 / パンサラッサ / 秋吉石灰岩 / 気候期転換

Outline of Final Research Achievements

The Early Permian is an age when the climatic mode changed from icehouse to greenhouse conditions. At this time, the algal-dominated reef community including boreal elements was drastically succeeded by the warmer-water sponge-dominated reef community on the Panthalassan atolls. During the transitional stage, microbes exclusively flourished because of absence of major reef-building metazoans and formed abundant microbialites including large oncoids. Thus these reef communities on the Panthalassan atolls sensitively responded to the climatic change. The change in the reef ecosystem almost coincided with the timing of the Gondwanan deglaciation and a pulse of the Panthalassan superplume.

Free Research Field

炭酸塩堆積学