| 潮水盆地下白垩统庙沟组铀的预富集及其找矿意义 |
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| 引用本文： | 王正其,管太阳.潮水盆地下白垩统庙沟组铀的预富集及其找矿意义[J].铀矿地质,2004,20(5):279-285. |
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| 作者姓名： | 王正其 管太阳 |
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| 作者单位： | 东华理工学院,江西,抚州,344000 |
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| 基金项目： | 核工业地质局“中国北西部铀成矿区划”专项地质调查研究项目资助 |
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| 摘 要： | 潮水盆地早白垩世经历了干旱型、相对潮湿型、干湿型古气候的演变过程。庙沟组下段主要由冲积扇 扇前平原辫状河沉积体系构成 ,上段则以曲流河或河湖交替沉积为特征。干湿型气候条件下“相对滞流环境”有利于铀的聚集与浓缩 ,并主要以吸附铀和解吸铀的形式预富集在庙沟组上段厚层红色或红、灰相间的细碎屑岩及其孔隙水中。笔者认为在压实成岩过程中 ,上述预富集的铀逐渐排出并迁移到孔隙度较高、渗透性较好的砂岩中 ,构成砂岩型铀成矿的直接铀源 ,对庙沟组砂岩型铀成矿起着重要的控制作用。因此 ,笔者提出与厚层红色或红、灰相间的细碎屑岩直接接触的砂体是砂岩型铀矿找矿的重要对象
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| 关 键 词： | 预富集 砂岩型铀矿 庙沟组 潮水盆地 |
| 文章编号： | 1000-0658(2004)05-0279-07 |
| 修稿时间： | 2004年2月12日 |
Uranium pre-concentration in Miaogou Formation, Lower Cretaceous and its prospecting significance in Chaoshui basin |
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| WANG Zheng qi,GUAN Tai yang.Uranium pre-concentration in Miaogou Formation, Lower Cretaceous and its prospecting significance in Chaoshui basin[J].Uranium Geology,2004,20(5):279-285. |
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| Authors: | WANG Zheng qi GUAN Tai yang |
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| Abstract: | Chaoshui basin experienced paleoclimate evolution period from arid,relatively humid,arid humid during Early Cretaceous.The lower member of the Miaogou Formation,Lower Cretaceous is mainly composed of alluvial fan-braided stream of fan front plain,while the upper member is characterized by meandering stream and stream lacustrine facies.The relatively stagnant environment during arid humid paleoclimate condition is favorable for the accumulation and concentration of uranium in sediments,and uranium was pre concentrated in adsorption form in thick bedded red or red grey alternate fine grained clastic sediments,upper member of Miaogou Formation and in desorption form in porous water.Authors suggest that during the process of compaction diagenesis,this previously pre concentrated uranium might be excluded and it migrated into high porous and well permeable sandstones becoming direct uranium source for the formation of sandstone hosted uranium deposit.This pre concentrated uranium plays important controlling role in uranium ore formation in sandstones of Miaogou Formation.Therefore,authors propose that sand bodies having direct contact with thick bedded red or red grey alternate fine grained clastic sediments should be important target for prospecting for sandstone hosted uranium deposit. |
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| Keywords: | pre-concentration sandstone-hosted uranium deposit Miaogou Formation Chaoshui basin |
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