内蒙古维拉斯托锌铜多金属矿床深部断层泥特征及其意义  

The Characteristics and Significance of Deep Fault Gouge from the Weilasituo Zinc-Copper Polymetallic Deposit in Inner Mongolia

作　　者：罗松英 曹建劲[1,2] 易泽邦 姜涛[1] 王正阳[1] 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275

出　　处：《光谱学与光谱分析》2016年第5期1508-1513,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41030425)资助

摘　　要：在维拉斯托矿区深部矿井的不同中段共采集了六组断层泥样品,采用X射线衍射和近红外光谱现代测试分析技术对样品进行分析测试,旨在探讨断层泥的矿物成分特征及其与成矿作用关系。分析结果表明,(1)断层泥中含有低温蚀变的粘土矿物(如蒙脱石、高岭石、地开石、绿泥石等)和中高温热液蚀变矿物(如石墨、黑云母、叶腊石、重晶石、蛇纹石、透闪石、阳起石等),同时也含有与成矿作用密切相关的矿物成分(如铜锌氧化物、氯铜钒、蓝铜矿、斑铜矿等)。(2)不同深度的断层泥矿物成分有所不同,地表浅部以浅变质矿物为主,深部以变质程度较深的矿物为主。(3)从断层泥矿物成分、矿物成因及发展演化规律来看,断层泥主要形成于含矿热液活动时期及矿后构造,且后期经历了表生氧化作用。(4)通过分析断层泥蚀变矿物成分及其矿物组合特征可以推测,该矿床形成于中-高温热液环境下,经历了硅化、高岭石化、绿泥石化、萤石化及绢云母化等蚀变过程。因此,通过分析断层泥的矿物成分及其矿物组合特征,不仅对指导找矿有一定的现实意义,同时也可以对矿床成因类型的判断提供重要的参考信息。The six groups of fault gouge samples were collected in different middle-sections from the underground mine of the Weilasituo zinc-copper polymetallic deposit,Inner Mongolia.The samples were analyzed with X-ray diffraction（XRD）and near infrared spectrum（NIR）to explore the mineral composition features of the fault gouges and their relationship with mineralization.The results are as follows：（1）The fault gouge samples contain the clay minerals which were formed in the low temperature alteration（such as montmorillonite,kaolinite,dickite,chlorite etc.）,the alteration minerals in the medium temperature or high temperature hydrothermal environment（such as graphite,black mica,pyrophyllite,barite,serpentine,tremolite,actinolite etc.）,and also the mineral compositions which were closely related to mineralization（such as copper-zinc oxide,copper-vanadium-chloride,azurite,bornite etc.）.（2）The mineral compositions of the fault gouge from different depth are different.Shallow earth＇s surface is mainly consisted of the low metamorphic minerals,and deep underground is mainly consisted of the high metamorphic minerals.（3）The mineral composition,mineral genesis and law of development of evolution of fault gouges suggest that,they were formed in the ore and metallogenic tectonic hydrothermal activity period,and had experienced the supergene oxidation later.（4）Through the analysis of the mineral compositions and alteration mineral assemblage characteristics of the fault gouges we can speculate that,the ore deposit was formed in medium-high temperature hydrothermal environment which had experienced the process of silicide,kaolinite,chloritization,hotaru petrochemical and sericitization alteration.Therefore,the analysis of the mineral compositions and mineral assemblage characteristics of the fault gouges,not only have certain practical significance for prospecting,but also can provide important reference information to study the genesis of the deposit.

关 键 词：维拉斯托矿床 断层泥 蚀变矿物 X射线衍射 近红外光谱 

分 类 号：P575.4[天文地球—矿物学] P614[天文地球—地质学]