Discovery and Significance of the Palaeogene Eolian Deposits in Lijiang , Yunnan Province
详细信息
- 责任者：Wu Hao (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Cui Xiaozhuang
- 刊名：Sedimentary Geology and Tethyan Geology
- 出版年：2011
- 卷期：31(1)
- 关键词：风成沉积作用 ; eolian sedimentation ; 气候 ; climate ; 云南 ; Yunnan Province
- 页码：p.13-18
- 图表：6 illus., 28 refs.
- 分类号：0803
- issnNo：ISSN1009-3850
- isbnNo：CN51-1593/P
摘要
The lower part (formerly Meile Formation) of the Baoxiangsi Formation (E2b) in Lijiang, Yunnan Province has long been interpreted as the hydrogenic deposits. The characteristic features of dish-shaped, crescent-type impact craters and frosted surface under an electronic microscope demonstrate that the lower part of the Baoxiangsi Formation may be assigned to the eolian dune deposits deposited in desert environments. The sedimentary characteristics also show that there were gradations from dry to humid climates in eastern Qinghai-Tibetan Plateau. It is inferred that this climatic change may be the sedimentary responses to the Eocene-Oliocene global cooling-drying events, the rapid uplift of the plateau and formation of the palaeomonsoon in East Asia.
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