| 冰沟门盆地晚二叠世晚期肃南组河流相特征 |
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| 引用本文： | 庞骏明.冰沟门盆地晚二叠世晚期肃南组河流相特征[J].铀矿地质,1986(4). |
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| 作者姓名： | 庞骏明 |
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| 摘 要： | 甘肃冰沟门异常区在晚二叠世晚期肃南组(P_2~s)时发育了两种类型古河流。以大磁窑河为代表的网状支流河,蚀源区铀源丰度低,河床坡降大,流程短,水流急,不利于铀矿化的形成。古梨园河发育的中-晚期为低-高弯蛇曲河,边滩发育,规模适中(河宽<300m),铀源丰富,河水中富含植物碎屑等有机质,铀在沉积一成岩阶段于河流转弯处和主、支流交汇处形成聚集,为后生阶段的工业富集提供了良好的前提。
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| 关 键 词： | 蛇曲河 点砂坝砂岩 晚二叠世晚期 |
FLUVIAL FACIES CHARACTERISTICS OF THE SUNAN FORMATION OF THE LATER PERIOD OF UPPER PERMIAN IN BINGGOUMEN BASIN |
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| Pang Junming.FLUVIAL FACIES CHARACTERISTICS OF THE SUNAN FORMATION OF THE LATER PERIOD OF UPPER PERMIAN IN BINGGOUMEN BASIN[J].Uranium Geology,1986(4). |
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| Authors: | Pang Junming |
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| Institution: | Pang Junming |
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| Abstract: | Abstract TWO types Of Paleoehannels were developed in the Sunan Formation Of the 1ater period of upper Permian(P_2~s)in Binggoumen anomalOUS area, Gansu Provinee.The braided tributary river represented by the Daciyao Rj- ver has a jow uranium abundance in the area of erosion and steep gradient Of the river bed.short water course and rapid water floW which are not favourable for the formation Of uranium mineralization.During the middle to late stage of the development Of the Guljyuan RiVer,lOW-high sinu osity meandering rivers were formed where point bars had developed in a moderate size(river width<300m).Uranium source was abundant,and the river water WaS enriched with organic matters Sueh aS plant debris.During the period of depositjon-diagenesis.uranjum accurrluIated at the rivet bend and at the inter- secting part between main channel and tributary channel proyiding a good prerequiste for the economic uranium concentration in the epigenetic period. |
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| Keywords: | Meandering river Point bar sandstone The later period of upper permian |
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