line-level: 2" class=MsoNormal>Sedimentary Facies of the Upper Member of Upper Cretaceous Sunjiawan Formation and Its Relation to Uranium Mineralization in Heishui Area of
详细信息
- 责任者：Xi Haiyin (No.240 Research Institute ; CNNC ; Shenyang 110032 ; China) ; Chen Debing
- 刊名：Mineral Deposits
- 出版年：2010
- 卷期：29(6)
- 关键词：铀矿 ; uranium ores ; 沉积相 ; sedimentary facies ; 内蒙古 ; Inner Mongolia
- 页码：p.1079-1087
- 图表：6 illus., 18 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The sediments of upper Sunjiawan Formation in Heishui area of Pingzhuan Basin are considered to be of the alluvial fan facies which can be divided roughly into three sub-facies: proximal pebbly braided plain, distal sandy braided plain and fan front flood plain; these sub-facies can be further divided into the following microfacies: debris flow, pebbly braided channel and bar, sandy braided channel and bar, flood fine-grained and peat swamp sediments. The uranium mineralization in this area was governed by sedimentary facies, and was concentrated in sand bodies of sandy braided rivers in the front of the distal sandy braided plain in the form of discontinuous and local enrichment, with less mineralization existent in peat swamp and mud-rock flow. The mudstone in peat swamp and mud-rock flow with abundant mud served as the local aquifuge, so that uranium mineralization shows discontinuous and unstable characteristics due to the thin peat swamp and inhomogeneous mud-rock flow sediments.