GEOCHEMISTRY AND SOURCE AREA ENVIRONMENT OF THE MIDDLE JURASSIC SANDSTONE IN SOUTHERN QIANGTANG BASIN
XU Lin1, XIAO Jin1, LIU Da-ming1,2, HU Lin1, LUO Shao-qiang1, TANG Hua1, ZHAO Yu3
1. Northwest Sichuan Geological Team, Sichuan Bureau of Geology and Mineral Exploration and Development, Mianyang 621000, Sichuan Province, China; 2. School of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 3. No. 6 Geological Team, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 851400, China
Abstract：The sandstone of Middle Jurassic Quemocuo Formation is developed in Jiangyumaluo area of southern Qiangtang Basin. The environment of sandstone source area is restored through petrogeochemical analysis. The chemical index of weathering (CIW), chemical index of alteration (CIA) parameters and A-CN-K diagram of sandstones show that the clastic compositions are intensely weathered. The index of compositional variability(ICV) and Th/Sc-Zr/Sc diagram indicate that the sandstone contains mainly the first sedimentary cycle materials, with a little recycled sediment. The Al2O3/TiO2, Th/Sc and Cr/Zr ratios of rock elements and La/Th-Hf discrimination diagram of source rocks suggest that the clastics of sandstone are mainly from the felsic source area of upper crust, mixed with a small number of basic femic rocks. The characteristics of trace elements and SiO2-K2O/Na2O, La-Th-Sc, Co-Th-Zr/10, Sc-Th-Zr/10 diagrams all indicate that the sandstones were formed in the continental margin rifting tectonic setting.
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