蒙其古尔矿床层间氧化带各亚带黏土矿物含量变化及其地质意义  

Content change of clay minerals in the subzone of interlayer oxidation zone in Mengqiguer deposit and its geological significance

作　　者：所世鑫[1,2] 刘红旭[2,3] 张晓[2] 曹清艳[2] 王勋[2] 陈峰[2,3] 虞航[2] 王永文[2,3] 

机构地区：[1]东华理工大学,江西抚州344000 [2]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029 [3]中国地质大学(北京),北京100083

出　　处：《世界核地质科学》2013年第1期7-11,共5页World Nuclear Geoscience

基　　金：中核集团重点课题专项及863项目资助;项目编号:DZD162-1

摘　　要：层间氧化带滚动发育造成长石、岩屑蚀变形成黏土矿物。通过扫描电镜照片发现,蒙其古尔矿床黏土矿物主要为高岭石、伊利石和伊蒙混层。对样品进行X衍射定量分析黏土矿物含量发现,3种黏土矿物含量变化各不相同,其中伊利石含量变化不大,说明层间氧化带滚动发育过程中温度、压力没有增大,结合地层沉降曲线发现,地层在早白垩世埋深达到最大,伊利石的形成终止于早白垩世;而高岭石、伊蒙混层在含矿过渡带含量的变化,反应过渡带中酸碱交替的特点则与铀的沉淀富集关系密切。Feldspars and rock fragments could be alternated into clay minerals due to the roiling of interlayer oxidation zone. With SEM pictures, we find that the most part of clay minerals in Mengqiguer deposit are kaolinite, illite and I/S. The result of X-diffraction experiment is that the content change of each kind of clay mineral in this deposit is different. The content of illite hardly changed in different subzone which means the temperature and pressure didn＇t increased during the rolling of the interlayer oxidation zone. With the buried maximum depth of the strata, it could be concluded thai tile formation of illile ends up at Early Crelaceous. The conlenl of kaolinite and I/S changed in the ore subzone which indicates that acid and alkali liquids ahernated in the transit zone,this zlternation is related to the deposition and enrichmeng of uranium.

关 键 词：蒙其古尔 黏土矿物 含量变化 酸碱交替 地层沉降 

分 类 号：P614.19[天文地球—矿床学] P575.5[天文地球—地质学]