Organic Geochemistry of the Shales from the Northwestern Proto-Atlantic, DSDP Leg 43
Organic Geochemistry of the Shales from the Northwestern Proto-Atlantic, DSDP Leg 43
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原大西洋西北部页岩的有机地球化学，DSDP 第 43 段
DOI：
10.2973/dsdp.proc.43.125.1979
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
B. Simoneit
中科院分区：
文献类型：
--
作者：
B. Simoneit
对北大西洋西部（386和387号站点）和安哥拉盆地（364号站点）白垩纪样品中提取的脂类进行了陆源组分的检测。正构烷烃和正构脂肪酸的分布模式表明，脂类的混合原地海洋和异地陆源起源。少量的二萜类化合物是由于一种植物成分而存在的。甾烯和主要的17/3（H）-藿烷组成的多环分子标记，并表明这些沉积物是非常不成熟的。检查了干酪根和腐殖物质的稳定碳同位素含量。386号站点样品的δC值处于陆源和/或湖泊成因的典型范围内，而其他样品的δ C值则表明更多的是海洋成因。腐殖物质的存在是未成熟的进一步迹象。
The lipids extracted from Cretaceous samples in the western North Atlantic Ocean (Sites 386 and 387) and Angola Basin (Site 364) were examined for terrigenous components. The distribution patterns of the n-alkanes and n-fatty acids indicate a mixed autoch¬ thonous marine and allochthonous terrigenous origin for the lipids. Minor amounts of diterpenoids are present as a result of a resinous plant component. Sterenes and predominantly 17/3(H)-hopanes constitute the polycyclic molecular markers, and indicate that these sediments are very immature. The kerogens and humic substances were examined for stable carbon isotope contents. The δC values for the samples from Site 386 are in the range typical for a terrigenous and/or lacustrine ori¬ gin, while the values for the other samples suggest a more marine origin. The presence of humic substances is a further indication of immaturity.