煎茶岭大型金矿床地球化学特征、成矿地球动力学及找矿标志  

Geochemical Characteristics,Metallogenic Geodynamics and Prospecting Indicator of the Jianchaling Large Gold Ore Deposit

作　　者：王瑞廷 王东生 李福让 陈荔湘 代军治 王义天[3] 闫臻[4] 

机构地区：[1]西北有色地质勘查局,西安710054 [2]西北有色地质勘查局711总队,陕西勉县724212 [3]中国地质科学院矿产资源研究所,北京100037 [4]中国地质科学院地质研究所,北京100037

出　　处：《地质学报》2009年第11期1739-1751,共13页Acta Geologica Sinica

基　　金："十一五"国家科技支撑计划项目(编号2006BAB01A11)资助的成果

摘　　要：煎茶岭大型金矿床的地球化学特征表明,超基性岩体是金的主要矿源层,成岩物质具幔源特点,金成矿过程与早期构造岩浆热液作用及后期构造热液蚀变作用有关,成矿流体为混合岩浆热液,晚期中酸性岩浆水是引起超基性岩蚀变变质的主要流体成分,金矿化过程中的硫是多期次、多来源。初步认为该矿床为造山型金矿床,成矿可分为两期,即晋宁晚期-加里东期和印支-燕山期,以后者为主,其主成矿期对应于区域上的后碰撞造山过程,陆内挤压造山是其成矿地球动力学背景。超基性岩体的褪化蚀变、F415断裂的长期活动及与其大角度相交的上、下盘次级断裂、裂隙系统与灯影组白云岩是煎茶岭金矿床的主要控矿因素。结合该区找矿实践,认为F145断裂带、Au-Ag-As-Hg-B等组合化探异常和蚀变白云岩为其重要的找矿标志。煎茶岭地区仍具有较好的找矿潜力,这对于指导该地区进一步勘查并取得找矿突破具有重要的现实意义。The geochemical characteristics of Jianchaling gold ore deposit indicate that the Jianehaling ultramafic intrusion is the main source of gold and rock-forming substances displays the mantle-derived feature. The gold metallogenesis is related to early structure magmatic hydrothermal process and late structure hydrothermal alteration. Orefforming fluid was hybrid magmatic hydrothermal one and the late intermediate-acid magmatic water was the main composition which is responsible for alteration metamorphossim of the ultramafic intrusion. The sulphur of gold mineralization was multiphase and polysources. The gold deposit should belong to orogenic-type deposit; its metallogenic process can be diviede into two periods, Late Jinning-Caledonian and Indosinian-Yanshanian, with the latter being dominating one. The main ore-forming time corresponds to the regional posteollisional orogeny. Therefore, intracontinental compressional orogeny formed its metallogenic geodynamics setting. Retrograde alteration of ultramafic intrusion, long-term activity of F1^45 fault and subsidiary fractures which intersect F1^45 at large-angles in its upper and heading side and its fissure system, and Dengying Group dolomite are main ore-controlled factors. Combined with exploration practice in this area, it is proposed that the fault belt, Au Ag-As-Hg-B geochemical exploration anomaly, as well as alterated dolomite are important indicators for prospecting. Therefore, the Jianchaling area is potential for mineral exploration, and this study has important realistic signification to guide prospecting and get breakthrough in the area.

关 键 词：煎茶岭 金矿床 地球化学 成矿地球动力学 找矿标志 

分 类 号：P618.51[天文地球—矿床学] P618.510.5[天文地球—地质学]