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Braided River Fan Delta Depositional System of the Early Cretaceous Giabulin Formation in the Xigaze Region,Xizang(Tibet)

Liu Zhifei Wang Chengshan (Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059)  
The Early Cretaceous Giabulin Formation,which is distributed along the north margin of the Yarlung Zangbo ophiolite suite,is easy to distinguish in the field.It is characterized by a sequence of terrigenous clastic rocks,principally mottled sandstones and conglomerates.Seven types of conglomerate,seven types of sandstone,three types of shale,and one limestone may be classified according to formation and their lithofacies characteristics.They comprise four sedimentary subfacies,from bottom to top:braided river subfacies,fan delta plain subfacies,fan delta front subfacies,and profan delta subfacies.This progression makes up a retrogradational sequence taking together the global Cretaceous transgress condition. Paleosalinity of the Giabulin Formation was 12.0‰-20.0‰,and its paleoenvironments were intermediate between semi brackish water and salt water.The sedimentary environments of the braided river of terrestrial facies and the fan deltas of transitional facies can be concluded from the discussion above. Sediments of the Giabulin Formation were derived chiefly from recycled subduction complexes,and from dissected transitional island arcs.Those provenances were all distributed nearby to the north of the Yarlung Zangbo River.During deposition of the Giabulin Formation,the Tectonic settings was relatively passive in the early stage and active in the late stage.
【Fund】: 国土资源部“九五”重大基础项目 国家杰出青年科学基金
【CateGory Index】: P534.53,P531
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