化石分子とその同位体の組成からみた白亜紀黒色頁岩の成因(<特集>白亜紀海洋無酸素事変の解明)

スポンサーリンク

概要

• 論文の詳細を見る

• The origin of Cretaceous black shales associated with Oceanic Anoxic Events is discussed based on evidence from sedimentary biomarkers, source-specific organic compounds and stable isotopic compositions of carbon, nitrogen, and sulfur. The black shales are characterized by extraordinarily high contents of hopanoids produced as structural reinforcements for prokaryotic membranes. Archaeal lipids such as polycyclic biphytane tetraethers have been sporadically found in OAE black shales. Nitrogen isotopic compositions of Cretaceous black shales suggest that most of the nitrogen in the black shales was fixed through a nitrogen fixation pathway. Derivatives of isorenieratene, accessory pigments of strictly anaerobic green sulfur bacteria, were often found in the black shales, suggesting the existence of a O_2/H_2S boundary in the euphotic zone when they were deposited. These lines of evidence suggest that diazotrophic cyanobacterium is a major primary producer during the black shale formation.

• 日本古生物学会の論文
• 2003-09-20

著者

• 大河内 直彦

  海洋科学技術センター固体地球統合フロンティア研究システム地球システム変動領域

関連論文

• アルケノン古水温計 (特集:環境を記録する化学物質および同位体(1))
• 化石分子とその同位体の組成からみた白亜紀黒色頁岩の成因(白亜紀海洋無酸素事変の解明)

スポンサーリンク