Palaeogeomorphologic features in the critical period of uranium mineralization in Binxian area, southern Ordos Basin
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摘要:
中侏罗世为直罗组下段沉积期，辫状河道为有利的铀储层砂体，铀矿（化）体主要赋存于辫状河砂体中，受沉积古地貌控制，主要发育在低洼区。晚侏罗世、早白垩世-古新世、始新世-中新世是砂岩型铀成矿期，古地貌控制了地下古水流的流向，控制着氧化还原带的分布和铀矿的富集：晚侏罗世铀预成矿期，古隆起区受到潜水淋滤，含铀物质向斜坡和低洼区迁移；早白垩世-古新世铀主成矿期，古地貌控制了含氧含铀水的水流方向，氧化还原带主要分布在古地貌斜坡区。
Abstract:During Middle Jurassic period, i.e., the sedimentary period of Lower Zhiluo Formation, the braided channel was a favor-able sand body of uranium reservoir that hosted uranium, and uranium was mainly controlled by palaeogeomorphology and mainly developed in low-lying areas. The Late Jurassic, Early Cretaceous-Paleocene and Eocene-Miocene were main uranium mineralization stages. Palaeogeomorphology controlled the migration of underground water, the distribution of the redox zone and the enrich-ment of uranium deposits. During the Late Jurassic uranium pre-mineralization period, diving leaching caused the migration of uranium-bearing materials from the uplift to the slope and low-lying areas; during the main uranium mineralization period of Early Cretaceous-Paleocene, palaeogeomorphology controlled the direction of the water flow with oxygen and uranium, and the redox zone was distributed mainly in the slope area of the ancient landform.
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致谢: 野外工作得到核工业二〇三所鄂南项目组的大力支持，审稿专家提出了建设性意见，在此一并表示诚挚的谢意。
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图 1 鄂尔多斯盆地南缘彬县地区构造位置
1—第四系-古近系；2—下白垩统；3—中侏罗统直罗组；4—中侏罗统延安组；5—中上三叠统；6—下三叠统；7—古生界；8—研究区；9—断层；10—砂岩型铀矿（化）点
Figure 1. Regional geological sketch map of Binxian area, southeastern Ordos Basin
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图 2 不同时期直罗组底部古地貌特征
1—地名；2—无矿孔；3—异常孔；4—矿化孔；5—等值线（m）
Figure 2. The paleo-geomorphological features of the bottom of Zhiluo Formation in different periods
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图 3 鄂尔多斯盆地南缘彬县地区直罗组沉积相剖（深度单位：m）
Figure 3. Sedimentary facies profile of Zhiluo Formation in Binxian area, southern Ordos Basin
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图 4 鄂尔多斯盆地南缘彬县地区直罗组下段氧化-还原带分布
1—地名；2—无矿孔；3—异常孔；4—矿化孔；5—氧化砂岩百分含量等值线；6—氧化带；7—氧化还原带；8—灰色残留砂体
Figure 4. Distribution of oxidation-reduction zone of Lower Zhiluo Formation in Binxian area, southern Ordos Basin
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