羌塘盆地上侏罗统白龙冰河组分子地球化学特征及意义  

Molecular geochemical characteristics and geological significance of Upper Jurassic Bailongbinghe Formation in the Qiangtang Basin

作　　者：孙涛[1] 王成善[2] 李亚林[2] 胡滨[2] 魏玉帅[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质大学青藏高原地质研究中心,北京100083

出　　处：《地球化学》2013年第4期352-360,共9页Geochimica

基　　金：国家自然科学基金(41172129);科学技术部中央高校基本科研业务专项资金(2011PY0238)

摘　　要：对羌塘盆地东湖地区上侏罗统白龙冰河组进行系统采样、有机岩石学及有机地球化学分析研究的结果表明,白龙冰河组灰岩沉积于碳酸盐台地环境,有机碳含量在0.11%～0.43%之间,有机质类型为Ⅱ型,母质主要来源于藻类及部分高等植物的输入,有机质镜质组反射率(Ro)在1.5%左右。生物标志化合物组成分布特征显示,白龙冰河组有机质沉积于分层的水体且底部水体盐度较高。The limestone samples were systematically collected from the Upper Jurassic in Donghu area of the Qiangtang Basin, northern Tibet, China, and analyzed by means of organic petrographic and organic geochemical methods. The results indicate that the limestones of Bailongbinghe Formation were deposited in a carbonate platform environment and have TOC values ranging from 0.11% to 0.43%. The organic matter in these samples are largely composed of algae-derived and a certain terrigenous inputs, which can be attributed to Type Ⅱ kerogen with a moderate oil-generating potential. The vitrinite reflectance data vary between 1.4% and 1.5%. Biomarker compositions suggest that organic matter in the Bailonghe Formation were deposited in a stratified water column with saline bottom water.

关 键 词：白龙冰河组 生物标志化合物 镜质组反射率 羌塘盆地 

分 类 号：P593[天文地球—地球化学] P595[天文地球—地质学]