河北省涞源县木吉村铜(钼)多金属矿田成矿物质来源探讨  

Discussion on the Ore-Forming Material Sources of Mujicun Copper(Molybdenum)Polymetallic Orefield in Laiyuan County,Hebei Province,China

作　　者：陈超[1] 王宝德[1] 牛树银[1] 张福祥[1] 马宝军[1] 张建珍[1] 孙爱群[1] 王海涛[1] 马国玺[2] 陈志宽[2] 王自力[3] 

机构地区：[1]石家庄经济学院资源学院,石家庄050031 [2]河北省保定地质工程勘查院,河北保定071051 [3]天津华北地质勘查局,天津300170

出　　处：《吉林大学学报（地球科学版）》2015年第1期106-118,共13页Journal of Jilin University：Earth Science Edition

基　　金：全国危机矿山项目(20109901,20089948);国家自然科学基金项目(40872137);河北省自然基金项目(D2013403018);石家庄经济学院博士基金项目(BQ201320)

摘　　要：木吉村铜(钼)矿田位于太行山脉中、北段阜平幔枝构造的北东倾伏端,涞源哑铃状杂岩体连接处西侧上盘拆离带的次级断陷盆地中,主要由斑岩型铜(钼)矿、矽卡岩型铁铜矿和外围热液脉型铅锌矿构成,是河北省目前探明的唯一大型铜(钼)多金属矿田,找矿远景巨大。鉴于矿床成矿物质来源在研究矿床成因和指导找矿中的重要作用,对木吉村矿田主要矿床矿石中黄铁矿、黄铜矿、方铅矿、辉钼矿、磁铁矿、石英和石膏等单矿物进行了硫、铅、碳、氢、氧、硅、铼等同位素测定、对比和分析。结果表明:矿田中硫同位素主值域δ34S=-3.5‰~3.2‰,主平均值为0.3‰;铅同位素206 Pb/204 Pb=15.566 0~17.072 0,平均为16.547 0,207Pb/204Pb=15.031 0~15.523 0,平均为15.258 0,208 Pb/204 Pb=36.292 0~37.375 0,平均为36.721 0;碳同位素δ13 C为-2.94‰^-2.18‰,平均为-2.62‰;硅同位素δ30 SiNBS-28值域为-0.3‰~0.2‰,平均0.0‰;辉钼矿w(Re)为(23.65~266.50)×10-6,平均值为142.33×10-6;δ18 OH2O值为-10.64‰~7.70‰,极差为18.34‰,平均值为-1.47‰,较标准岩浆水值稍低,δD值为-148.4‰^-89.0‰,极差为59.4‰,平均值为-113.7‰,略低于岩浆岩δD值域。从而认为,木吉村矿田成矿物质主要来源于地球深部,成矿溶液以岩浆水为主,部分来自大气降水。The Mujicun copper（molybdenum）polymetallic orefield in the Taihang Mountains,is located in the secondary faulted basin developed in the upper block of detachment zone on the west side of the neck of the dumbbell shaped Laiyuan igneous complex,the northeastern pitching end of the Fuping mantle branch structure.It is composed of porphyry copper（molybdenum）deposit,skarn ironcopper deposit and hydrothermal vein lead-zinc-silver deposit in periphery,and become the most perspective large-scale copper（molybdenum）polymetallic orefield in Hebei Province at present.Considering the study of ore-forming material sources is crucial for further understanding the metallogenesis of the deposit and the direction of ore-prospecting,authors tested and analyzed sulfur,lead,carbon,hydrogen,oxygen,silicon,and rhenium isotopic compositions in such minerals from the ore as chalcopyrite,galena,pyrite,molybdenite,magnetite,quartz and gypsum.The data showed that the major value ofδ34 S changes from-3.5‰ to 3.2‰,with the average of 0.3‰;206 Pb/204 Pb from15.566 0to 17.072 0,with the average of 16.547 0;207 Pb/204 Pb from 15.031 0to 15.523 0,with the average of 15.258 0;208Pb/204 Pb from 36.292 0to 37.375 0,with the average of 36.721 0;δ13 C from-2.94‰to-2.18‰,with the average of-2.62‰;δ30Si from-0.3‰to 0.2‰,with the average of0.0‰;w（Re）from 23.65μg/g to 266.50μg/g,with the average of 142.33μg/g;δ18OH2Ofrom-10.64‰to 7.70‰,with the average of-1.47%,δD from-148.4‰to-89.0‰,with the average of-113.7‰ which is less than that of the standard magmatic water.These isotopic data mentioned above show that the ore-forming materials were mainly derived from the deep source and the ore-forming solutions are mainly composed of magmatic water and partly of atmospheric water.

关 键 词：幔枝构造 物质来源 成矿溶液 铜(钼)矿床 木吉村矿田 太行山 

分 类 号：P618.3[天文地球—矿床学]