Discovery of the Large-Scale Paleo-Weathering Crust in the Qiangtang Basin , Northern Tibet, China
详细信息
- 责任者：Fu Xiugen（Chengdu Institute of Geology and Mineral Resources ; China Geological Survey ; Chengdu 610082 ; China) ; Wang Jian
- 刊名：Geological Bulletin of China
- 出版年：2009
- 卷期：28(6)
- 关键词：风化壳 ; weathering crust ; 羌塘盆地 ; Qiangtang Basin
- 页码：p.696-700
- 图表：1 illus., 1 plate, 16 refs.
- 分类号：0803
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Recently, a new paleo-weathering crust occurred at the top of Carboniferous and Permian strata and Xiaochaka Formation, was discovered in the North Qiangtang Depression, central uplift and the South Qiangtang Depression during field investigation of petroleum geology, indicating a regional distribution. New geologic survey indicates that the era of weathering and erosion are various in different regions. During the Late Permian, most part of the South Qiangtang and central uplift regions was uplifted into a land and subjected to the weathering and erosion, and then a paleo-weathering crust was formed widely at the top of the Longge and Lugu Formation. The discovery of large-scale paleo-weathering crust is important for assessing petroleum geological conditions in the Qiangtang Basin and the overall significance of basin evolution.