Evaluation of Oceanic Anoxic Events in Lete Mesozoic from the Environment-Earth Scientific point of view.

从环境-地球科学角度评价莱特中生代海洋缺氧事件。

基本信息

批准号：
06640602
负责人：
HIRANO Hiromichi
金额：
$ 1.34万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

It has been preliminarily reported that oceanic anoxic events had happened at three times, Albian age, Cenomanian/Turonian age boundary and Coniacian-Santonian ages in Cretaceous of Late Mesozoic. Amoung these, the Cenomanian/Turonian boundary oceanic anoxic event has intensively studied, because the event situates in the age boundary which is the continuous target for the Subcommission of the Cretaceous stratigraphy of IUGS,there are many favorable sections in North America and Europe and there are many sections of the ages easily accessible for scientists in the world. Biostratigraphic resolution of this age is also high in the Japanese sequence, and therefore the timing of the event was comparatively easily elucidated. I confirmed the oceanic anoxic event finished in the time between Neocardioceras juddi zone below and Watinoceras devonense zone above. Thus, the high resolution of the Japanese mega-fossil biostratigraphy is demonstrated in the different discipline.The Albian oceanic anoxic event has been in chaos in recognition from the global point of view. I studied the total organic carbon contents, maturity of hydrocarbon, biomarker and stable carbon isotope analyzes of mudstone samples from the Sorachi and Lower Yezo Groups. I studied the ammonoid, inoceramid bivalvian and radiolarian biostragtigraphy at the same time for those groups and revised the resolution for the international correlation. These works resulted in the confirmation of four times of oceanic anoxic events in the ages between Aptian and Albian in the Yezo forearc basin. This is the first concrete evidence of the Lower Cretaceou anoxic events in the Northwestern Pacific.

初步报道说，海洋性缺氧事件发生在三次，阿尔比亚时代，cenomanian/turonian年龄边界和晚白垩纪的康尼亚西亚 - 桑顿时代。这些事件是对这些事件进行了深入的研究，因为该事件处于时代边界的局势，这是IUGS的白垩纪地层的持续目标，因此在北美和欧洲有许多有利的部分，在Ages中有许多有利的部分，并且可以轻松地访问World of World of Colicist。在日本序列中，该年龄的生物地层分辨率也很高，因此事件的时机相对容易阐明。我确认了海洋缺氧事件在下方的Neocardioceras Juddi区与上方的Watinoceras Devonense区之间完成的时间。因此，在不同的学科中证明了日本大型化石生物地层学的高分辨率。从全球的角度来看，阿尔比亚海洋缺氧事件已经在混乱中处于混乱状态。我研究了来自索拉奇和下叶族基团的泥岩样品的总有机碳含量，碳氢化合物的成熟度，生物标志物和稳定的碳同位素分析。我同时研究了这些群体的氨基膜，无毒药比瓦尔维亚人和放射性生物群，并修改了国际相关性的决议。这些作品导致确认在Yezo前臂盆地Aptian和Albian之间的海洋缺氧事件四次。这是西北太平洋地区较低的克雷列美缺氧事件的第一个具体证据。