Lithofacies of the Upper Middle Triassic Guanggaishan Formation on both Sides of the Bailongjiang Uplift, Southwestern Qinling Orogenic Belt: Implications to the Basin Analysis
详细信息   
摘要
The lithofacies of the upper Middle Triassic Guanggaishan Formation outcropping along both northern and southern sides of the Bailongjiang uplift (composite anticline), southwestern Qinling orogenic belt were studied in this paper. By sedimentation and lithofacies, the Guanggaishan Formation is identified and classified into five types. Nine cycles of lithofacies sequence have been recognized from the Feixian section, Diebu in northern side of the Bailongjiang uplift. The assemblage of lithofacies indicates that the Guanggaishan Formation is of relatively ramp continental slope facies within remnant sea basin. According to deep sea basins and remnant basin in the Late Paleozoic-early Middle Triassic for the Taohe Basin, it is inferred that there could be no shallow platform carbonate facies under the both flysch basins, which means poor prospective for oil-gas resources exploration in the region.
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