| 云南腾冲山寨盆地水下冲积扇特征及对砂锡的控矿作用 |
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| 引用本文： | 刘寄陈.云南腾冲山寨盆地水下冲积扇特征及对砂锡的控矿作用[J].地球科学,1988(4). |
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| 作者姓名： | 刘寄陈 |
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| 作者单位： | China University of Geosciences，Wuhan 430074 |
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| 摘 要： | 水下冲积扇是山间谷地被堵截堰塞,山麓堆积进入水盆地的一种特殊“相”,以重力流堆积为主体,间夹湖沼和上迭河流沉积。熔岩流多次堵塞增高,堰塞坝的侵蚀和盆地的沉积充填,这三种因素综合作用的结果,形成了具有一定厚度的不同沉积类型组合。各类沉积因其搬运分选机制不同而形成不同的聚锡能力,决定了对砂锡的控矿作用。
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| 关 键 词： | 水下冲积扇 泥石流 重力砂流 流体化砂流 活层 底板控矿 |
CHARACTERISTICS OF SUBMARINE ALLUVIAL FAN IN SHAN-ZHAI BASIN, TENGCHONG, YUNNAN, AND ITS CONTROL FUNCTION OVER SN-BEARING SAND DEPOSITS |
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| Liu Jichen.CHARACTERISTICS OF SUBMARINE ALLUVIAL FAN IN SHAN-ZHAI BASIN, TENGCHONG, YUNNAN, AND ITS CONTROL FUNCTION OVER SN-BEARING SAND DEPOSITS[J].Earth Science-Journal of China University of Geosciences,1988(4). |
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| Authors: | Liu Jichen |
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| Abstract: | The submarine alluvial fan is a particular "facies" formed in intermountain valleys, which mostly consists of gravity flow deposits, occasionally, has some lacustrine-swamp deposits, and superimposed river deposits. Different kinds of sedimentary sequences are formed by the stoppage of the lava flow, the erosion of sand dam and the sedimentary filling of the basin. Each type of sedimentation has different capacities in the accumulation of Sn-placer because of different mechanisms in transportation and sorting. This has controlled the placer-Sn accumulation. |
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| Keywords: | submarine alluvial fan mud-rock flow sand gravity flow fluidized sand flow active stratum bottom surface controlling deposits |
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