松辽盆地晚白垩世典型露头剖面四醚类脂物分布特征及其古环境参数的适用性研究

古温度的定量重建是古环境/气候学研究的重要内容，不同领域的学者为此一直进行着不懈的探索。近年来，一种基于古/细菌的细胞膜类脂化合物――甘油二烷基甘油四醚(GDGTs, Glycerol dialkyl glycerol tetraethers)的古温度指标得到了广泛的应用与发展。松辽盆地是我国东北部大型中、新生代陆相沉积盆地，是我国陆相白垩系发育最为完整的地区。但因为缺乏定量古温度重建数据，使得海陆对比难以进行，不利于探讨我国乃至东亚地区白垩纪古气候/环境演变的规律和机制。松辽盆地陆相白垩纪古温度的重建研究还鲜见报道。本项目将通过对松辽盆地晚白垩世典型露头剖面沉积记录的GDGTs进行定性、定量研究，分析其GDGTs组成特征，判断其GDGTs源输入特征，计算GDGTs的各项古环境参数，结合其他有机分子指示的古环境特征，判识GDGTs古环境参数特别是温度计算在松辽盆地古温度重建研究中的适用性.

A number of attempts have been made to develop global time series temperature reconstructions for the gelogical history. In recent years, novel temperature proxies have been proposed based on membrane lipids of crenarchaeota/bacteria. At present, two classes of glycerol dialkyl glycerol tetraethers (GDGTs), namely isoprenoid GDGTs and branched GDGTs are being extensively studied and the temperature proxies include TEX86 and MBT/CBT. Songliao Basin located in northeastern China is one of the largest Cretaceous continental rift basins in the world. Well-preserved Cretaceous lacustrine deposits in this basin provide a unique opportunity to study the paleoenvironment and paleoclimate of the non-marine Cretaceous. However,little paleotemperature information exists about the continent, which hampers the research of paleoclimate in continental Cretaceous. The distributions of GDGTs of Late Cretaceous lacustrine sedimentary strata in the Songliao Basin will be studied, which could provide the information on the biological sources of GDGTs. GDGT-based paleoenvironmental index will be calculated. Compared with the reconstructed paleoenvironment based on other molecular biomarkers, paleoenvironmental applicability of GDGTs, especially paleotemperature will be judged in the Songliao Basin.