| 鄂尔多斯盆地西北部下白垩统罗汉洞组中的铀矿化与沉积相 |
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| 引用本文： | 漆富成,刘武生,张字龙,李治兴.鄂尔多斯盆地西北部下白垩统罗汉洞组中的铀矿化与沉积相[J].华东地质学院学报,2009,32(3):201-204. |
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| 作者姓名： | 漆富成 刘武生 张字龙 李治兴 |
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| 作者单位： | 核工业北京地质研究院,北京100029 |
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| 基金项目： | 国防科工委核能开发项目"鄂尔多斯盆地地浸砂岩型铀矿成矿环境及综合预测评价" |
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| 摘 要： | 基于沉积相的研究认为鄂尔多斯盆地西北部罗汉洞期在缓倾斜坡带发育河流相一辫状河三角洲相一湖泊相沉积。依据酸解烃特征参数C1／∑C，C1／C2＋及酸解烃判别分析（z值法、Φ值法及判别因子法）论证了赋存于罗汉洞组地层中的烃气源于三叠系上统湖相生油岩系中的油型气。通过综合剖析赋存于罗汉洞组中油气的地球化学特征、油气还原蚀变特征和铀矿化关系，论证了罗汉洞组的褪色蚀变（漂白）是渗逸到该层位中的酸解烃类气体对岩石发生诱发蚀变的结果，论述了沉积成岩作用期间在辫状河三角洲相中发生铀初步富集，提出沉积相组合与油气还原蚀变带的空间配置是后期铀矿化空间定位的制约因素。
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| 关 键 词： | 辫状河三角洲 铀初步富集 油气还原蚀变 铀矿化空间 定位 鄂尔多斯盆地 |
Uranium Mineralization and Sedimentary Facies of the Luohandong Formation of the Lower Cretaceous in Northwestern Ordos Basin |
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| QI Fu-cheng,LIU Wu-sheng,ZHANG Zi-long,LI Zhi-xing.Uranium Mineralization and Sedimentary Facies of the Luohandong Formation of the Lower Cretaceous in Northwestern Ordos Basin[J].Journal of East China Geological Institute,2009,32(3):201-204. |
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| Authors: | QI Fu-cheng LIU Wu-sheng ZHANG Zi-long LI Zhi-xing |
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| Institution: | (Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, China) |
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| Abstract: | Based on the research of the sedimentary facies, it is concluded that the sedimentary systems are fluvial river-braided delta-lacustrine depositional system during the Luohandong period at the gentle slope zone in north- western Ordos basin. According to characteristic parameters C1/∑ C and C1/C2＋ and discriminatory analyses （Z value method, ~ value method and discriminatory factor method） of acidolysis hydrocarbon, the hydrocarbon gas in Luohandong formation from the oil-type gas in lacustrine source rocks of Upper Triassic is demonstrated. By analyzing geochemical characteristics of oil-gas, and oil-gas reduced alteration characteristics and their relation to the uranium mineralization in the Luohandong formation, this paper demonstrates the discolored alteration （bleaching） in the Luohandong formation is the result of induced alteration of rocks due to acidolysis hydrocarbon gas infiltrating into this horizon, discusses the preliminary enrichment of uranium in braided delta during process of sedimentation-diagenesis, presents the sedimentary facies association and spatial configuration of oil-gas in- duced alteration zone are constraint factors of space orientation of uranium mineralization horizons in the late stage. |
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| Keywords: | braided delta preliminary enrichment of uranium oil-gas induced alteration space orientation of u- ranium mineralization Ordos basin |
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