Geochemical Characteristics and Signatures of the Sandstones from Zangxiahe Formation in Qiangtang Basin
详细信息
- 责任者：Song Chunyan (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Wang Jian
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(3)
- 关键词：砂岩 ; sandstone ; 盆地演化 ; basin evolution ; 羌塘盆地 ; Qiangtang Basin
- 页码：p.508-518
- 图表：illus., 2 tables, 44 refs.
- 分类号：0803
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
The Qiangtang basin is located between the Jinshajiang suture(JSS)and Bangong-Nujiang suture.It is an important petroliferous basin in the northern Tibet Plateau,China.It is formed by the stacking of many basins of different stages,properties and generations.There have always been a lot of debate about the Late Triassic property of Qiangtang basin,so the Late Triassic Zangxiahe Formation is selected as the research subject in this paper.The Zangxiahe Formation,which is deposited on the northern margin of the Qiangtang basin,is a very thick flysch(>3 000 m)with sandstone and shale sediments.It is an very important indicator for the Late Triassic property of Qiangtang basin.The X-ray diffraction(XRD),major compositions,rare earth elements and trace elements of the whole rocks and the fission tracks of clastic zircon of the sandstones from Zangxiahe Formation in Qiangtang basin are studied in this paper,which reveals that the tectonic settings of source rock area belong to active continental margin and continental island arc.Combined with the results of previous studies,it is concluded that the main source area is JSS and the major source rocks are the felsic rocks.The felsic rocks are likely the S-COLG which intruded into the JSS in Middle Triassic.The deposition time of the Late Triassic Zangxiahe Formation is the same as the formation time of JSS.So the Late Triassic Qiangtang basin is a peripheral foreland basin.
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