东昆仑五龙沟矿田岩金沟金矿床成矿时代新认识  

Metallogenic age of Yanjingou gold deposit in Wulonggou gold orefield,eastern Kunlun Mountains

作　　者：陈柏林[1] 王永[1] 韩玉 陈建林 CHEN BaiLin;WANG Yong;HAN Yu;CHEN JianLin(Institute of Geomechanics,CAGS,Beijing,100081,China;Qinghai No. 1 Academy of Geology and Mineral Exploration,Ping’an 810600,Qinghai,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]青海省第一地质矿产勘查院,青海平安810600

出　　处：《矿床地质》2019年第3期541-556,共16页Mineral Deposits

基　　金：中国地质调查局地质调查项目“东昆仑五龙沟金矿田构造解析与找矿预测”(编号12120113096000);院所长基金项目“构造体系与成矿作用的耦合与衍生:以中国东部地区为例(编号:JYYWF20180602)”资助成果

摘　　要：五龙沟金矿田位于东昆仑造山带中段,矿田内金矿床主要沿岩金沟、萤石沟-红旗沟、三道梁-苦水泉3条NWW向构造破碎带发育。文章以岩金沟金矿床为例,在补充开展金矿石流体包裹体测试和显微鉴定的基础上,运用石英流体包裹体Rb-Sr同位素测年——直接测定被封闭的成矿流体年龄的方法,测得成矿年龄为237Ma,结合成矿构造、成矿地质体、矿床地质地球化学的综合分析,确定金矿床的成矿时代为印支早期。金矿床属于远成低温热液型,成矿温度为195~319℃。综合控矿构造和成矿地质体等相关研究成果认为,进一步找矿方向是红旗沟脑片麻状花岗闪长岩成矿地质体影响范围之内有NWW向偏脆性构造破碎带发育的部位,或者是有隐伏成矿地质体的附近。The Wulonggou gold orefield is located in the middle part of eastern Kunlun orogenic belt. Gold ores occur only along three NWW-trending fault fracture zones of Yanjingou zone, Yinshigou-Hongqigou zone and Sandaoliang-Kushuiquan zone in the orefield. The authors conducted measuring of fluid inclusions and mineral analysis of ore by means of Rb-Sr isochron dating of fluid inclusions in quartz from the Yanjingou gold deposit. This method is regarded as a method which can directly measure the ore fluid, which yielded a metallogenic age of the gold deposit of about 237 Ma. Combined with the analysis of metallogenic structure, metallogenic geological bodies and geological-geochemical characteristics of the deposit, the authors consider that mineralization occurred in early Indosinian stage. The gold deposit belongs to low temperature hydrothermal type with the metallogenic temperature being about 195~319℃. The further prospecting of gold deposit should be focused on the area in influenced by metallogenic geological bodies, where there are NWW-trending structural belts.

关 键 词：地球化学 远成低温热液矿床 印支早期成矿 金矿找矿方向 五龙沟金矿田岩金沟金矿床 

分 类 号：P618.51[天文地球—矿床学]