| 酒西盆地下白垩统下沟组重力流水下扇沉积 |
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| 引用本文： | 端木合顺,朱莲芳.酒西盆地下白垩统下沟组重力流水下扇沉积[J].沉积学报,1990,8(2):75-86. |
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| 作者姓名： | 端木合顺 朱莲芳 |
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| 作者单位： | 中国科学院兰州地质所 |
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| 摘 要： | 重力流水下扇由四种岩相组成:1.砾岩相,属水下碎屑流沉积;2.砾质泥岩相,是多成因的;3.砂岩相,系高密度浊流沉积;4.粉砂岩泥岩相,为低密度浊流和正常湖泊沉积。细分为十五种亚相。岩相的空间配置关系表明水下扇是由突变性洪水事件(和水下滑坡)-水下碎屑流-高密度浊流-低密度浊流的重力流系列形成。本文对重力流沉积从层序结构、沉积体形态、岩相变化和构造控制诸方面进行了探讨。
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| 关 键 词： | 酒西盆地 下白垩绕 重力流沉积事件 永下碎屑流 浊流 重力流 水下扇 |
| 收稿时间： | 1988-01-20 |
GRAVITY- FLOW- SUBMERGED- FAN DEPOSITS OF LOWER CRATACEOUS XIAGOU FORMATION,JIUXI BASIN,GANSU |
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| Institution: | Lanzhou Institute of Geology, Academia Sinica |
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| Abstract: | 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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