| 鄂尔多斯盆地东北部直罗组底部砂体成因分析--砂岩型铀矿床预测的空间定位基础 |
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| 引用本文： | 焦养泉,陈安平,王敏芳,吴立群,原海涛,杨琴,张承泽,徐志诚.鄂尔多斯盆地东北部直罗组底部砂体成因分析--砂岩型铀矿床预测的空间定位基础[J].沉积学报,2005,23(3):371-379. |
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| 作者姓名： | 焦养泉 陈安平 王敏芳 吴立群 原海涛 杨琴 张承泽 徐志诚 |
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| 作者单位： | 1.中国地质大学资源学院,武汉 430074; |
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| 基金项目： | 国家核工业地质局重点生产科研项目
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中国地质大学(武汉)校科研和教改项目
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国家重点实验室基金 |
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| 摘 要： | 砂体的结构和规模因沉积体系的不同而异,它们对铀成矿贡献的差别很大。作者通过露头调查、钻孔岩心分析和砂分散体系制图,对鄂尔多斯盆地东北部直罗组下段进行了成因分析。研究发现,直罗组底部砂体并非传统认识上的辫状河成因。实际上,它可以分为上、下两个亚段。虽然两个亚段的物源和砂分散方向具有很好的继承性(北西-南东向),但成因完全不同。下亚段主要由辫状河体系和辫状河三角洲体系构成,其中辫状河三角洲平原构成了研究区的主体。上亚段主要由曲流河体系和(曲流河)三角洲体系构成,虽然(曲流河)三角洲平原也是研究区的主体构成部分,但是(曲流河)三角洲前缘却占据了一定的空间,这是湖泊向西北方向扩展的结果。正是由于上、下亚段成因的不同,导致了下亚段砂体具有较大的规模和较好的连通性,而上亚段砂体规模变小、非均质性增强。砂岩型铀矿勘探的实践证明,矿体主要聚集于下亚段砂体中。因此看来,上述认识可以用于砂岩型铀矿成矿规律的总结和铀成矿空间的定位。
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| 关 键 词： | 沉积体系 砂体成因 砂岩型铀矿床 直罗组 鄂尔多斯盆地 |
| 文章编号： | 1000-0550（2005）03-0371-09 |
| 收稿时间： | 2004-09-23 |
| 修稿时间： | 2004-11-29 |
Genetic Analysis of the Bottom Sandstone of Zhiluo Formation, Northeastern Ordos Basin:Predictive base of spatial orientation of sandstone-type uranium deposit |
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| JIAO Yang-quan,CHEN An-ping,WANG Min-fang,WU Li-qun,YUAN Hai-tao,YANG Qin,ZHANG Cheng-ze,XU Zhi-cheng.Genetic Analysis of the Bottom Sandstone of Zhiluo Formation, Northeastern Ordos Basin:Predictive base of spatial orientation of sandstone-type uranium deposit[J].Acta Sedimentologica Sinica,2005,23(3):371-379. |
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| Authors: | JIAO Yang-quan CHEN An-ping WANG Min-fang WU Li-qun YUAN Hai-tao YANG Qin ZHANG Cheng-ze XU Zhi-cheng |
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| Institution: | 1.Faculty of Earth Resources, China University of Geosciences, Wuhan 430074;2.Geologic Party No. 208, Bureau of Geology, CNNC, Baotou, Inner Mongolia 014010 |
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| Abstract: | The sandstone structure and scale vary with different depositional systems, and have different contribution to uranium mineralization. According to outcrop research, drilling core analysis, and sand distributed system drawing, we analyzed the lower member of Zhiluo Formation, northeastern Ordos basin. The results show that the lower member of Zhiluo Formation is not formed by braided stream in traditional recognition. In fact, it can be divided into the upper and lower sub-members. Although the upper and lower sub-members have well inheritance in provenance and sand distributed direction-which is NW-SE, they have different genesis. The lower sub-member of Zhiluo Formation comprise braided stream system and braided delta regime, and braided stream delta plain is the main body; the upper sub-member of Zhiluo Formation comprise meandering river system and meandering river delta regime, and meandering river delta plain is the main body, meandering river delta front take up some space also, which is the result of lake extension to northwest. So, the low sub-member has larger scale and better connectivity, while up sub-member has smaller scale and higher heterogeneity. The practices of sandstone-type uranium exploration also prove that the ore mainly occurred in low sub-member of Zhiluo Formation. Therefore, the genetic recognition is favorable for the rule summary and space orientation of uranium mineralization. |
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| Keywords: | sedimentary system sandstone genesis sandstone-type uranium deposit Zhiluo Formation Ordos basin |
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