Paleoenvironmental reconstruction of the Late Santonian Songliao Paleo-lake
Paleoenvironmental reconstruction of the Late Santonian Songliao Paleo-lake
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晚桑顿世松辽古湖古环境重建
DOI：
10.1016/j.palaeo.2016.05.027
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发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
Shilling Andrea
中科院分区：
文献类型：
--
作者：
Cao Huairen;Hu Jianfang;Peng Ping'an;Xi Dangpeng;Tang Youjun;Lei Yan;Shilling Andrea
晚白垩世通常被描述为具有多变的温室气候，然而，相对较少的大陆遗址保留了这一时期的地质记录，限制了陆地气候和环境的信息。松辽盆地是世界上最大的中生代大陆裂谷盆地之一。因此，这个保存完好的湖相存款提供了一个独特的记录，在白垩纪的陆地古环境条件。本文报道了SLB东侧晚白垩世湖相沉积（嫩江组下部）的有机地球化学资料。对后金沟剖面露头样品进行了如下分析：（1）总有机碳（TOC）含量和同位素组成;（2）生物标志物分布，包括脂肪烃、芳烃和甾烷的鉴定和相对含量测定;（3）正构烷烃化合物特定稳定碳和氢同位素组成。有机碳同位素（δ 13 C）和生物标志化合物分布特征表明，嫩江组一段上段（上K2 n1）有机质主要来源于水生植物和陆生植物。嫩江组二段下部（K2 n2下段）有机质的生物标志物分布及有机碳和正构烷烃的δ 13 C值表明有机质来源于藻类、细菌和高等植物的混合物。由于海侵，海水入侵，表明存在的24-正丙基-胆甾烷和24-异丙基-胆甾烷，发生在较低的K2 N2。松辽古湖K2 n2下段短链正构烷烃氢同位素组成（δ 2 H）为负，表明该古湖处于极端湿润的环境，可能是淡水的大量涌入造成了古湖的大规模泛滥。后金沟剖面高分辨率生物标志物和稳定同位素记录表明，晚白垩世海水入侵后，松辽古湖泊环境发生了突变。
The Late Cretaceous is often characterized as having a variable greenhouse climate, however, the relatively few continental sites preserving geologic records from this time exist limiting information on terrestrial climate and environments. Worldwide, the Songliao Basin (SLB) of northeastern China is one of the largest Cretaceous-age continental rift basins. Thus, this well-preserved lacustrine deposit provides a unique record of terrestrial paleoenvironmental conditions during the Cretaceous. Here, we report organic geochemical data from Late Cretaceous-age lacustrine deposits (lower Nenjiang Formation) from the eastern side of the SLB. Outcrop samples were collected from the Houjingou section and the following analyses were performed: (1) total organic carbon (TOC) content and isotopic composition, (2) biomarker distribution, including the identification and determination of relative amounts of both aliphatic and aromatic hydrocarbons and steranes, and (3) compound specific stable carbon and hydrogen isotopic compositions ofn-alkanes. The biomarker distribution and stable carbon isotopic values (δ13C) of the TOC indicate organic matter (OM) from the uppermost section of the first member of the Nenjiang Formation (Upper K2n1) was mainly sourced from aquatic macrophytes and land plants. In the lower part of the second member of the Nenjiang Formation (Lower K2n2) the biomarker distribution and δ13C of both the TOC andn-alkanes indicate that OM was sourced from a mixture of algae, bacteria, and higher plants. As a result of marine transgression, seawater incursions, indicated by the presence of 24-n-propyl-cholestanes and 24-iso-propyl-cholestanes, occurred episodically in Lower K2n2. The negative hydrogen isotopic composition (δ2H) of short chainn-alkanes in Lower K2n2indicates an extremely humid environment and it is likely that an influx of freshwater caused large-scale flooding of the Songliao Paleo-lake. High-resolution biomarker and stable isotope records from the Houjingou section demonstrate abrupt environmental changes in the Songliao Paleo-lake following seawater incursions during the Late Cretaceous.
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影响因子：
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DOI：
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