柴达木盆地东部新近系沉积相与砂岩型铀矿找矿方向  

A study on sedimentary facies of the Neogene and exploration prospective of sandstone-type uranium deposits in eastern Chaidam Basin

作　　者：邵飞[1] 唐相生 

机构地区：[1]中国地质大学研究生院,湖北武汉430074 [2]核工业二七Ο研究所,江西南昌330200

出　　处：《西北大学学报（自然科学版）》2005年第4期450-454,共5页Journal of Northwest University（Natural Science Edition）

基　　金：中国核工业总公司地质局基金资助项目(200011)

摘　　要：目的分析柴达木盆地东部新近系沉积相,为砂岩型铀成矿预测提供依据。方法利用实测剖面和前人钻孔、测井及区域地质等资料,在总结新近系沉积特征的基础上,识别了各沉积相带,并分析了其空间展布;结合砂岩型铀成矿理论,探讨了砂岩型铀成矿与沉积相的关系。结果识别出辫状河相、辫状河三角洲相、扇三角洲相、湖泊相等4种沉积相和9种沉积亚相类型;上新统狮子沟组辫状河三角洲相砂体是铀成矿有利部位。结论清水河斜坡带是砂岩型铀成矿有利地区。Aim Sedimentary facies is one of the main bases used to predict the exploration prospective of sandstone-type uranium deposits, so it is necessary to study the sedimentary facies of the Neogene in the east part of Chaidam Basin. Methods Based on our field data of sedimentation and drilling, logging data and papers published by previous researchers, a systematic analysis has been conducted to investigate the sedimentary facies. The characteristics of sedimentary facies and the spatial distribution of sedimentary facies are also studied. Further, the relationships between the sedimentary facies and the sandstone-type uranium mineralization are discussed according to the theory about leachable uranium mineralization. Results The study demonstrated that 4 sedimentary facies and 9 subfacies could be recognized from the Neogene in the working area. The braided channel delta sandstone bodies in the Shizigou Formation is the favorable sandstone body for the uranium mineralization. Conclusion The Qingshuihe Zone are favorable areas for the formation of sandstone-type uranium deposits.

关 键 词：新近系 沉积相 砂岩型铀矿 找矿方向 柴达木盆地东部 

分 类 号：P588.2[天文地球—岩石学] P619.14[天文地球—地质学]