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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2010-06
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Age and tectonic implications of the Late Triassic Nadi Kangri volcanic rocks in the Qiangtang basin,northern Tibet,China

FU Xiu-gen,WANG Jian,CHEN Wen-bin,FENG Xing-lei Chengdu Institute of Geology and Mineral Resources,Chengdu 610081,China  
A new paleo-weathering crust occurred at the top of Carboniferous and Permian strata and Xioachaka Formation was discovered in the central uplift of the Qiangtang basin,the north Qiangtang depression and the south Qiangtang depression during field investigation of petroleum geology.It indicates a regional distribution.Combined with the basal conglomerate observed on the bottom of the Nadi Kangri Formation,this paper confirms that a sedimentary hiatus probably exists between the Nadi Kangri and underlying strata.Therefore,the Nadi Kangri strata represent a new history of the Mesozoic Qiangtang basin,and the age of the Nadi Kangri volcanic rocks represents the onset of the Mesozoic Qiangtang basin.The dacite from the middle part of the north Qiangtang basin (the Shengli River area) gives a SHRIMP zircon U-Pb age of (217.1±4.9) Ma,which represents an eruption age of the Nadi Kangri volcanic rocks in this area.Additionally,the results of this study show that the 40Ar/39Ar plateau age of the diabase from the Gangma Co area (the west part of the north Qiangtang basin) is 197±4 Ma.Previously the authors also obtained SHRIMP zircon U-Pb ages of the Nadi Kangri volcanic rocks from the east,the west,and the middle parts of the Qiangtang basin.They are (220.4±2.3) Ma,208~225 Ma,205~220 Ma,respectively.This indicates that the eruption age of the Nadi Kangri volcanic rocks in the Qiangtang basin is about 205 ~220 Ma.These data show that the onset of the Mesozoic Qiangtang basin should be the Late Triassic time (about 205~220 Ma B.P.).The Nadi Kangri basalts have high Nb/Zr (0.039~0.058),Ta/Hf (0.095~0.15) and Zr/Y (3.57~6.01) ratios.In the tectonic discrimination diagrams,such as Zr vs.Zr/Y and Th/Hf vs.Ta/Hf,the Nadi Kangri basaltic rocks mostly plot in the "within-plate" setting field.Taking the early sedimentary history into account,the authors conclude that the Mesozoic Qiangtang basin formed in an extensional setting.
【Fund】: 国家自然科学基金资助项目(4070202 40972087);; 四川省青年科技基金资助项目(09ZQ026-006);; 国家油气专项(XQ-2009-01)
【CateGory Index】: P548
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