新疆冰草沟地区铀矿床围岩蚀变与铀矿化的关系

Relationship Between the Wall-rock Alteration and Uranium Mineralization of Uranium Deposit in Bingcaogou Area,Xinjiang

结合冰草沟地区地质工作成果,分析了区域地质背景,并对该区铀矿床围岩蚀变进行了系统的宏观及微观研究,基本查明了该区围岩蚀变的种类特征、成因、发育程度、蚀变期次、蚀变热液性质,研究表明:(1)区内与铀成矿有关的围岩蚀变发育较广的主要有褐铁矿化、赤铁矿化、碳酸盐化、绿泥石化、硅化、黄铁矿化、钠长石化及萤石化等;(2)区内铀矿化与赤铁矿化、红色碳酸盐化、钠长石化、黄铁矿化、去硅化作用关系密切,为近矿围岩蚀变,矿段处近矿围岩蚀变种类越多、强度越强,则铀矿化程度越高;(3)区内围岩蚀变可划分为黄铁矿化期,钠长石化、方解石化期,白云石化、沸石化期等3个蚀变发育时期。在上述分析的基础上,讨论了区内铀矿化特征,并分别探讨了围岩蚀变作用与铀富集成矿的关系以及围岩蚀变与铀矿化的赋存关系。上述分析对于冰草沟地区进一步研究与铀矿化有关的围岩蚀变找矿信息,查明铀矿富集规律有一定的参考价值。

Combing with some related geological working results of Bingcaogou area in Xinjiang,the regional geological background is analyzed,the macroscopic and microscopic systematic study of the wallrock alteration of the uranium deposit in the area are conducted,the species characteristics,genesis,development degree,alteration period and alteration hydrothermal properties of the wall-rock alteration in the area are discussed in detail,the results show that：（1）the wall-rock alterations of ferritization,hematitization,carbonatization,chloritization,silicification,pyritization,albitization and hotaru petrochemical are closely related to the uranium mineralization in the area,besides that,the above wall-rock alterations are well developed;（2） the relationships between uranium mineralization and hematitization,red carbonatization,albitization,pyritization and desilicification,if the more types of alteration of surrounding rock,and the stronger the intensity of wall-rock alteration in the area of ore blocks,the degree of uranium mineralization will be higher;（3）the development period of the wall-rock alteration of the area can be divided into pyritization period,albitization and calcilization period,dolomitization and zeolitization period. Based on the above analysis results,the uranium mineralization characteristics of the area is discussed,besides that,the relationship between the wall-rock alteration and uranium enrichment and the occurrence relationship between the wall-rock alteration and uranium mineralization. The above analysis results related the relationship between the wall-rock alteration and uranium mineralization of uranium deposit in Bingcaogou area can provide some reference for the further study of the prospecting information of wall-rock alteration related to uranium mineralization and the discussion of enrichment regularities of uranium enrichment.