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引用本文:邢秀娟 柳益群 樊爱萍. 鄂尔多斯盆地店头地区砂岩型铀矿成因初步探讨[J]. 中国地质, 2006, 33(3): 591-597.
XING Xiu-juan, LIU Yi-qun, FAN Ai-ping. Genesis of sandstone-type uranium deposits: A case study in the Diantou area of the Ordos basin[J]. Geology in China, 2006, 33(3): 591-597(in Chinese with English abstract).
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鄂尔多斯盆地店头地区砂岩型铀矿成因初步探讨
邢秀娟 柳益群 樊爱萍1,2
1.大陆动力学国家重点实验室(西北大学);2.西北大学地质学系,陕西 西安 710069
摘要:
提要:通过电子显微镜及电子探针分析,对鄂尔多斯盆地东南部店头地区砂岩型铀矿物的赋存状态、主要伴生元素及其沉淀机制进行了初步探讨。研究区主要的铀矿物类型为沥青质铀矿,以显微浸染状充填于砂岩孔隙及胶结物中;与U密切伴生的元素有Fe、Se、Pb、Si、Ti、Cr、S等,与铀矿物伴生的矿物组合有黄铁矿、方铅矿、钛铀矿以及与其关系密切的硒矿化;主要含铀层位富含有机质及黄铁矿,夹有透镜状、条带状煤线,具备丰富的还原物质,有利于铀元素的还原富集,因此认为影响研究区铀沉淀的主要地球化学障是还原障和吸附障。
关键词:  电子探针  砂岩型铀矿  鄂尔多斯盆地
DOI:
分类号:
基金项目:国家重点基础研究发展规划项目(2003CB214603)资助。
Genesis of sandstone-type uranium deposits: A case study in the Diantou area of the Ordos basin
XING Xiu-juan, LIU Yi-qun, FAN Ai-ping1,2
1.State Key Laboratory of Continental Dynamics (Northwest University;2.Department of Geology,Northwest University, Xi’an,710069, Shanxi, China
Abstract:
Abstract:The authors studied the mode of occurrence, main accompanying elements and precipitation mechanism of sandstone-type minerals in the Diantou area of the southeastern Ordos basin by using the electron microprobe and microprobe. The dominant uranium mineral in the study area is pitchblende, which occurs as microdisseminations filling in pores and cements of sandstone. The elements associated intimately with uranium are Fe, Se, Pb, Si, Ti, Cr and S and the mineral assemblage of uranium includes pyrite, galena, brannerite and its closely related selenium mineralization. The main uranium-bearing horizon contains rich organic matter and pyrite, intercalated with lenticular and banded coal seams. It contains abundant reducing material, which is favorable for uranium reduction and concentration. Therefore, the authors think that the reducing barrier and adsorption barrier are the main factors responsible for uranium deposition in the study area.
Key words:  electron microprobe  sandstone-type uranium deposit  Ordos basin