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Organic compound analyses in the sediments at the Cretaceous/Tertiary and the Permian/Triassic boundary, and study of environmental changes at those time.

白垩纪/第三纪和二叠纪/三叠纪边界沉积物中的有机化合物分析，以及当时环境变化的研究。

基本信息

批准号：
10640472
负责人：
MITA Hajime
金额：
$ 2.05万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

n-Alkanes, isoprenoid hydrocarbons, cyclic hydrocarbons, aromatic hydrocarbons, amino acids, fatty acids, dicarboxylic acids, maleimides and carbazoles in the Cretaceous/Tertiary boundary sediments at Kawaruppu, Hokkaido, Japan were analyzed. Depth profiles of amounts of n-alkanes, isoprenoid hydrocarbons, cyclic hydrocarbons, fatty acids, maleimides and carbazoles resembled each other. Amounts of those compounds were almost same in the Cretaceous samples, and those in the Tertiary samples were nearly 2/3 of those in the Cretaceous samples. Those in the lower 2/3 of the boundary claystone were extremely small and those in the upper 1/3 of the boundary claystone were gently recover to the level in the Tertiary samples. This pattern is thought that as a reflection of biomass at that time. Diagenetic indices as CPI values of n-alkanes and fatty acids, isomer ratios of alkylaromatics, enantiomeric ratios of dicarboxylic acids, and diasteromeric ratios of steranes and hopanes were almost co … More nstant through the all sample horizons. Therefore, thermal alteration in the boundary calystone is not different from that in the Cretaceous and Tertiary samples. Any evidence of extraterrestrial organic compounds were not found in the all sample horizons.n-Alkanes, isoprenoid alkanes and aromatic hydrocarbons in the Permian/Triassic boundary sediments at Tenjin-Maru, Tokushima, Japan were analyzed. Steranes and hopanes were not found in the P/T samples and would be degraded during 250 million years. Ratios of pristane to phytane in the middle of the boundary black chart were higher than 1.0 and those in the other sample horizons were lower than 1.0. This result shows that sedimentation condition in the middle of the boundary black chart is rather oxic than super anoxic condition. Ratios of pyrene to chrysene, ratios of 2-methyl- to 1-methylnaphthalene in the middle of the boundary black chart were higher than those in the other sample layers. It shows the extremely high temperature condition as wide wild fires at that time. Less

对日本北海道川浦白垩纪/第三系界线沉积物中的正构烷烃、异戊二烯烃、环状烃、芳香烃、氨基酸、脂肪酸、二元酸、马来酰亚胺和咔唑类化合物进行了分析。正构烷烃、类异戊二烯、环状烃、脂肪酸、马来酰亚胺和咔唑的含量的深度剖面彼此相似。这些化合物在白垩纪样品中的含量几乎相同，第三系样品中的含量几乎是白垩纪样品的2/3。边界粘土岩的下部2/3处的岩性极小，上1/3处的岩性略恢复到第三系的水平。这种模式被认为是当时生物量的反映。成岩指数如正构烷烃和脂肪酸的CPI值、烷基芳烃的异构体比、二元酸的对映异构体比和甾烷和正庚烷的非对映异构体比几乎都是…的。更即时地通过所有样本地平线。因此，边界帽岩的热蚀变与白垩纪和第三纪样品中的热蚀变没有什么不同。对日本德岛天津丸二叠系/三叠系界线沉积物中的正构烷烃、类异戊二烯烷烃和芳香烃进行了分析。在P/T样品中没有发现甾烷和正庚烷，它们将在2.5亿年内降解。在边界黑图的中间，白藜芦醇与植烷的比值大于1.0，其他样本层的比值小于1.0。这一结果表明，边界黑图中部的沉积条件与其说是超缺氧条件，不如说是含氧条件。在边界黑图的中部，芘/黄烯、2-甲基/1-甲基萘的比值均高于其他样本层。它显示了当时极高的气温条件，如广袤的野火。较少