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《Acta Sedimentologica Sinica》 2010-05
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A New Sedimentary Model for the Qiangtang Basin

WANG Jian FU Xiu-gen TAN Fu-wen CHEN Ming HE Jiang-lin(Chengdu Institute of Geology and Mineral Resources,Chengdu 610081)  
The newly-discovered paleoweathering crust sediments are developed beneath the continental volcanic rocks,sedimentary-volcaniclastic rocks,and alluvial-diluvial sandstones and conglomerates from the Upper Triassic Nadigangri Formation,and diachronously overlapped upon the Upper Triassic(?)Xiaochaka Formation and its underlying strata including the Carboniferous-Permian strata in the Qiangtang Basin,indicating a sedimentary gap between the Nadigangri Formation and its underlying strata.These volcanic rocks,sedimentary-volcaniclastic rocks and alluvial-diluvial sandstones and conglomerates from the Nadigangri Formation deposited above the paleoweathering crust represent the onset of the Qiangtang Basin sediments during the Mesozoic.The SHRIMP zircon U-Pb isotopic dating gives the ages of 219.5±2.1 Ma and 219±2 Ma for the basalt and granodiorite from central Qiangtang,and 216.8±2.1 Ma and 217.3±2.5 Ma for the vitric tuff and crystal tuff from the Nadigangri Formation in the Shenglihe and Wanghuling areas in the Qiangtang Basin.All these age determinations imply that the onset of the Mesozoic Qiangtang Basin should be traced back to the Late Triassic.The deposition went through the continental to marine sedimentary overlap during the early evolution of the Mesozoic Qiangtang Basin.The sedimentary overlap started from the alluvial-diluvial facies and accompanied by magma intrusion,volcanic eruption and pyroclastic deposition.On the whole,the deposition displays a deepening-upward transgressive sequence,characteristic of a passive marginal rift basin.
【Fund】: 国家自然科学基金项目(批准号:40972087);; 国家油气专项“青藏高原重点盆地油气资源战略调查与选区(选区[2009]01)”联合资助
【CateGory Index】: P618.13
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