Palaeo-ecology of Inoceramus solved by biomarker

2014 Fiscal Year Final Research Report

• Project/Area Number: 23540544
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: The University of Tokyo
• Principal Investigator: OGIHARA Shigenori 東京大学, 理学(系)研究科(研究院), 助教 (50214044)
• Co-Investigator(Renkei-kenkyūsha): SHIGETA Yasunari 国立科学博物館, 地学研究部, 研究主幹 (30270408)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: イノセラムス / 化学合成生物群集 / バイオマーカー / 個別炭素同位体 / 炭酸塩ノジュール

Outline of Final Research Achievements

The result of biomarker analysis has distribution of n-alkane was from n-C13 to n-C21, bimodal peak in n-C16 and n-C17, and CPI (C13-21) value indicated the price of 0.79. The distribution of n-alkane is characteristic in the Inoceramus samples from Teshio Nakagawa Tanno-sawa which preservation was good. Individual carbon isotope compositions of each n-alkane were not felled below -30 per mill. The results of biomarker analysis of other Inoceramus samples consisted of the mixture of low carbon numbered (n-C13 to n-C21) alkane and n-C29 and n-C31 alkane. PMI and crocetane, were not detected. The fatty acid composition was characterized by excel C16 fatty acid and its carbon isotope composition higher than-30 per mill. Perylene was a dominant compound in the PAH fraction extracted from Inoceramus samples. Thus the special biomarker which determines chemosynthetic community was not detected, but a possibility was indicated focusing on a result of the biomarker analysis.

Free Research Field

有機地球化学