东秦岭钼、金多金属矿区域成矿系统与成矿预测  

Metallogenic System and Prediction of Mo-Au Polymetallic Deposits in East Qinling

作　　者：肖荣阁[1] 白凤军[1,2] 原振雷[3] 冯建之[4] 张宗恒[5] 刘国印[6] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]河南省有色金属地质勘查总院,河南郑州450052 [3]河南省国土资源科学研究院,河南郑州450016 [4]河南省地质矿产勘查开发局第一地质调查队,河南洛阳471023 [5]河南省国土资源厅,河南郑州450016 [6]河南省地质调查院,河南郑州450001

出　　处：《现代地质》2010年第1期1-10,共10页Geoscience

基　　金：河南省科学技术厅"东秦岭(河南段)钼矿床类型及评价标志"项目(豫财建[2007]262号)

摘　　要：以区域成矿理论为基础,将东秦岭构造带划分为华北古陆南缘、北秦岭造山带、南秦岭造山带和扬子古陆等4个构造单元,其间商丹缝合断裂带分割南北秦岭造山带,形成华南古陆和华北古陆的分界,区内断裂构造及燕山期岩浆岩发育。研究区位于台地边缘,具有基底和盖层二元台地沉积结构,基底太古宇太华岩群变质岩和盖层熊耳群火山岩及燕山期岩浆岩构成区内重要的矿源岩。根据东秦岭地区的地球化学特征分析,矿源岩的基本特征是亏损铜,而钨和钼、铅和锌、金和银则分别在不同的物源岩中富集。研究区内矿产资源丰富,以热液成因钼、金多金属矿床为主,根据成矿流体成因及其与地质作用的关系,划分为3个成矿系统,即岩浆热液作用成矿系统、火山热液作用成矿系统及构造热液作用成矿系统,其分别与燕山期岩浆热液、熊耳期火山热液及中生代构造热液活动有关。根据燕山期岩浆岩、熊耳期火山机构及中生代的区域构造性质,分别预测了研究区内重点成矿区域。According to regional metallogenic theory,East Qinling structural belt can be divided into the southern margin of North China paleo-continent,orogenic belts of North Qinling and South Qinling,and the fourth tectonic unit of the Yangtze paleo-continent.The South and North Qinling orogenic belts are bound by the Shangdan suture-fault zone,forming the boundary of North China paleo-continent and South China paleo-continent.Fractures and Yanshanian magmatic rocks are well developed within the East Qinling structural belt.The study area is located at the margin of the block,with dual mesa sedimentary structure composed of basement and cap-rocks.The basement consists of Archean Taihua Group metamorphic rock and Xiong＇er Group volcanic rocks and Yanshanian magmatic rocks,which constitutes ore source rocks in this area.Ore source rocks are characterized by depletion in Cu and enrichment in W,Mo,Zn,Pb,Au and Ag in the cap-rocks.Mineral resources are rich in this area,and dominated by hyrdothermal genetic Mo-Au polymetallic deposits.Based on the genesis of ore-forming fluid and other geological actions,three metallogenic systems are classified,including magmatic hydrothermal metallogenic Mo-Au polymetallic deposits,volcanic hydrothermal metallogenic system and tectonic hydrothermal metallogenic system.They are correspondingly related to early Yanshannian hydrothermal activities,Xiong＇ernian volcanic hydrothermal and Mesozoic tectonic hydrothermal activities.Meanwhile,the key metallogenic areas within the study area are predicted based on the analysis of regional tectonic natures of the three tectonic activities.

关 键 词：东秦岭 钼、金矿 矿源岩 成矿系统 成矿预测 

分 类 号：P618.65[天文地球—矿床学]