北海道北大夕張地域下部白亜系の炭素同位体比変動と有機地球化学的特徴

概要

論文の詳細を見る
The Aptian to Albian sediments of the Yezo Supergroup in the northern Oyubari area are well-laminated, being affected little by macrobioturbation. A positive peak of carbon isotope excursion, high organic carbon contents and high sulfur contents are detected in the middle Albian. The redox environmental indices, S2/S3, pristane/phytane and bisnorhopane/hopane ratios, show a reducing condition in this stratigraphic level. The good correlation of S2/S3 ratio vs. TOC indicates that the high organic carbon contents in this basin depend primarily on the reducing conditions. Therefore it is apparent that a reducing environment (i.e. anoxic to dysoxic environment) prevailed in this basin, and this regional event is correlated with the global OAE1c.
日本有機地球化学会の論文
1997-05-30