西藏中白垩世和始新世岩相古地理  

Middle Cretaceous and Eocene lithofacies and paleogeography in Tibet

作　　者：李祥辉[1] 王成善[1] 伊海生[1] 李勇[1] 

机构地区：[1]成都理工学院沉积地质研究所,四川成都610059

出　　处：《中国区域地质》2001年第1期82-89,共8页Regional Geology of China

基　　金：国家杰出青年自然科学基金!(49625203);国家重点基础研究专项经费!(羌塘盆地演化与油气聚集;1-5)资助

摘　　要：西藏中白垩世海相区可以识别出9种沉积相类型6个相组合带，老第三纪时可以鉴别出约5种岩相类型4个相组合带。建议将这些岩相组合带视为对应的海相次级地层分区。拉萨地体和羌塘地体在白垩纪中期海水分布可能继承了侏罗纪时的格局，并进一步扩展到了羌塘地体的南部和中部；与此同时，拉萨地体主体和特提斯喜马拉雅仍然被海水淹没，与全球同期海侵事件表现一致。：Nine lithofacies in the marine Middle Cretaceous Albiian－Cenomanian and five lithofacies in the Paleogene can be recognized in Tibet of China.It is suggested that six lithofacies-association zones recognized in the nine lithofacies separately correspond to six marine secondary stratigraphic areas from southern to northern Tibet， and that four lithofacies- association zones in the five marine lithofacies correspond to three marine secondary stratigraphic areas.It is proposed that the sea-water of the Tethyan Ocean invaded most parts of the Lhasa terrane and the southern and central Qiangtang terrane （open gulf） in the Middle Cretaceous，which was probably in agreement with the synchronous global transgression event．

关 键 词：西藏 特提斯洋关闭 岩相古地理 中白垩世 始新世 海侵事件 沉积相 

分 类 号：P531[天文地球—古生物学与地层学]