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《Acta Sedimentologica Sinica》 1990-02
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GRAVITY- FLOW- SUBMERGED- FAN DEPOSITS OF LOWER CRATACEOUS XIAGOU FORMATION, JIUXI BASIN, GANSU

DuanMu Heshun Zhou lian Fang (Lanzhou Institute of Geology, Academia Sinica)  
The strata of Lower Crataceous Xiagou Formation, Jiuxi basin, were deposited in the fault subsidence of nomarine.The sedimentation of gravity-now-submerged-fan is studied in this paper.The authors defined the fan-shaped bodies of sand conglomerates interlayer with lacustrine mudstone and not changed to the river deposits, as Igravity-flow-submerged-fan according to the investigating more than one hundred layers of sandy gravel rock and eighty-four pieces of thin section.The submerged-fan consist of four lithofacies ( conglomerate facies, conglomeratic mudstone facies, sandstone facies and silt / mudstone), including fifteen sublithofacies.The analysis of lithofacies show that conglomerate facies were mainly deposited by subaqueous debris flow, sandston facies by high-density turbidite and silt/ mudstone by low-density turbidity currents and lacustrine sedimentation.Conglomeratic mudstone facies is polygenetic, that is , a genetic spectrum was not formed by them. Having analyzed spacial relationship of lithofacies for the genesis, it is proposed thai the events of catasstrophic flood (subaqueous llandslip) , high-density turbidity currents and low-density turbidity currents are the genetic sequence of hydraulic development in the little sized fault-sidence basin it is discussed that the spacial relationship of lithofacies, control factor of tectonic and the environment evolution in the sedimentary context model of the gravity-flow-submerged-fan at last.To make the sedimentological study of suberged-fan is favourable for developing auto-genetic tnd auto-stored oil-reservoir.
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