| 内蒙古查干德勒苏地区下白垩统巴音戈壁组沉积体系及其对可地浸砂岩型铀矿的制约 |
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| 引用本文： | 张万良.内蒙古查干德勒苏地区下白垩统巴音戈壁组沉积体系及其对可地浸砂岩型铀矿的制约[J].铀矿地质,2002,18(3):144-149. |
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| 作者姓名： | 张万良 |
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| 作者单位： | 核工业地质局270研究所,江西,南昌县,330200 |
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| 摘 要： | 查干德勒苏地区位于内蒙古巴音戈壁盆地东部，早白垩世在伸展构造体制下于断陷盆地内形成了厚度约1000m的巴音戈壁组碎屑岩系地层，该层位是层间氧化带砂岩型铀矿找矿目的层，可划分为3个岩性段，下段为洪（冲）积相，水下扇相和扇三角液相沉积，中段段为浅湖相－半深湖相－较深湖相沉积，上段为滨浅湖或三角液相沉积，巴音戈壁组从下往上由洪（冲）积相，水下扇相，扇三角液相到浅湖较深湖相又到滨浅湖，三角液相的相序结合，反映湖盆水体从浅到深又变浅的演化过程，巴音戈壁组构成三级层序发育完整的低位，湖浸和高位体系域，中还对砂质岩的渗透性进行了分析，提出三角洲相，滨浅湖相砂质岩对形成层间氧化带砂岩型铀矿是有利的。
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| 关 键 词： | 沉积相 层序地层 砂岩型铀矿 巴音戈壁组 查干德勒苏 |
| 文章编号： | 1000-0658(2002)03-0144-06 |
| 修稿时间： | 2001年6月21日 |
Depositional system of the Bayangobi Formation,LowerCretaceous and its control over in-situ leachable sandstone-type uranium deposits in Chagandelesu area,Inner Mongolia |
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| ZHANG Wan-liang.Depositional system of the Bayangobi Formation,LowerCretaceous and its control over in-situ leachable sandstone-type uranium deposits in Chagandelesu area,Inner Mongolia[J].Uranium Geology,2002,18(3):144-149. |
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| Authors: | ZHANG Wan-liang |
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| Abstract: | Chagandelesu area is situated in the eastern part of Bayangobi basin,Inner Mongolia.In the Early Cretaceous,a detrital rock series (Bayangobi Formation) with a thickness of about 1000m was formed within a down-faulted basin under the extensional tectonic regime.The Bayangobi Formation is the prospecting target for interlayer oxidation zone sandstone-type uranium deposits,and is divided into three lithologic members:the lower member--proluvial(alluvial),subaqueous fan or fan-delta facies sediments;the middle member--shallow lacustrine-semi-deep lacustrine-deep lacustrine facies sediments;the upper member--littoral shallow lacutrine or delta facies sediments.The facies order of Bayangobi Formation represents the evolution process of basin water from the shallow(early period)to the deep(middle period)then again to the shallow(late period)level.The Bayangobi Formation composed of a third sequence order reflects respectively a lowstand system tract(LST),a transgressive system tract(TST)and a highstand system tract(HST).The paper also makes an analysis on physical properties of psammites of Bayangobi Formation,and proposes that psammites of delta and littoral shallow lacustrine facies are favourable for the formation of interlayer oxidation zone sandstone-type uranium deposits. |
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| Keywords: | depositional facies sequence stratigraphy sandstone-type uranium deposit Bayangobi Formation Chagandelesu |
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