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松辽盆地白垩系青山口阶下部广泛分布一套富含有机碳的黑色泥岩、页岩沉积,它具有干酪根碳同位素正偏、重排甾烷含量低,普遍存在伽马蜡烷生物标志化合物等有机地球化学特征,代表了白垩纪温室效应时间窗内古湖泊贫氧环境条件下的沉积产物。结合生物地层研究成果,认为青山口阶下部曾发生过古湖泊缺氧事件,其层位大体可与白垩纪古海洋Cenomanian-Turonian界线事件层进行对比,由此提出了松辽盆地青山口阶下部的时代归属于晚白垩世Cenomanian晚期—Turonian早期的新观点。
A set of black mudstone and shale deposits rich in organic carbon are widely distributed in the lower part of the Qingshankou step of the Cretaceous Cretaceous Songliao Basin. It is characterized by positive carbon offset of kerogen, low content of rearrangement sterane and widespread presence of biomarkers of gamma-wax alkaloids And other organic geochemical characteristics, on behalf of the Cretaceous greenhouse effect within the ancient lake lakes oxygen environment deposition products. According to the research results of biostratigraphy, it is considered that the anaerobic episode of ancient lakes occurred in the lower part of Qingshankou step, and its horizon can be compared with Cenomanian-Turonian boundary event of Cretaceous ancient ocean. Therefore, the lower part of Qingshankou step in Songliao Basin The era belongs to Late Cretaceous Cenomanian Late-Turonian Early New Perspective.