Structural,lithofacies,and paleogeographic restoration of the Bagong Formation in the Qiangtang Basin
Qiangtang basin is an important marine sedimentary deposit in China,with broad prospects for mineral resources exploration.According to the field measured profile data,regional geological survey data and drilling data,combined with stratigraphy,petrology and paleontology,the paleogeography of Bagong Formation in Qiangtang Basin was restored.Based on the characteristics of lithologic association,carbon isotope migration and pale ontology,the isochronal framework of Bagong Formation is established.It is found that Rigan Mismatched Formation,Juhuashan Formation,TuPamela Formation,Bagong Formation,Cangxiahe Formation and Goulushan Kecuo Formation are heterogeneous deposits in the same time.According to lithofacies combination and structural characteristics,the Bagong Formation in Qiangtang Basin has four sedimentary environments:delta facies,coastal facies,tidal flat facies and shelf facies.On the basis of sedimentary facies,the sedimentary evolution of Bagong Formation was explored,combined with the regional tectonic background.At this time,the deep water area appeared in the northern part of the North Qiangtang Basin.Due to the two-way thrust of the Hoh Xil orogenic belt and Qiangtang block,the crust flexes and sags,forming a back-arc foreland basin,while the South Qiangtang basin is a passive continental margin basin bordering the Bangong Lake-Nujiang Ocean basin.Finally,on this basis,the mineralization is analyzed.
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