地质学报2018，Vol.92Issue(5)：1003-1018,16.
豫西吉家洼金矿床成矿时代和成矿物质来源:来自闪锌矿Rb-Sr同位素年龄和Pb同位素的证据
Metallogenic Epoch and Source of Ore-Forming Material of the Jijiawa Au Deposit, Western Henan Province: Evidence from Rb-Sr Dating and Pb Isotopes
摘要
Abstract
The Jijiawa gold deposit,located in the western part of the Xiong'ershan gold polymetallic ore district,Henan Province,is typical of tectonically altered rock-quartz vein-type gold deposit.Orebodies are hosted mainly within nearly NS-trending fault zone and are distributed in the form of "Y" shape.Mineralization is dominated by vein-veinlet and disseminated pyritized altered rock gold deposits,with minor being quartz vein-type gold deposits.The hydrothermal ore-forming process can be divided into four stages:pyrite-quartz vein stage (Ⅰ),quartz-pyrite vein stage (Ⅱ),quartz-polymetallic sulfides stage (Ⅲ),and quartz-carbonate vein stage (Ⅳ).This study carried out Rb-Sr isotopic dating for the sphalerites from main mineralization stage of the Jijiawa Au deposit to restrain the ore-forming time.The yielded isochron age of 118.2±2.4Ma suggests that the deposit was formed in Early Cretaceous.The age is basically in agreement with that of Miaoling,Qiyugou,Gongyu and other gold deposits in the Xiong'ershan area,which is of significance in constraining the ore-forming age in the Xiong'ershan area.Sr and Pb isotope analysis shows that the Jijiawa Au deposit had a mixing origin of the materials from crust and mantle,with the Early Cretaceous granite likely contributing main metallogenic materials.In the context of regional geology,we suggest that the Jijiawa Au deposit was the product of the regional intensive tectonomagmatic-fluid activity in the Xiong'ershan area in Early Cretaceous,and it is also a component part of the large-scale gold mineralization in eastern China.关键词
闪锌矿Rb-Sr同位素测年/Pb同位素/成矿时代/成矿物质来源/吉家洼金矿/熊耳山Key words
sphalerite Rb-Sr isotopic dating/Pb isotope/metallogenic epoch/source of ore-forming material/Jijiawa Au deposit/Xiong'ershan引用本文复制引用
张兴康,叶会寿,颜正信,李思伟,樊玉朋,张福斌..豫西吉家洼金矿床成矿时代和成矿物质来源:来自闪锌矿Rb-Sr同位素年龄和Pb同位素的证据[J].地质学报,2018,92(5):1003-1018,16.基金项目
本文为中国地质科学院基本科研业务费项目(编号YYWT-201713)和国土资源部成矿作用与资源评价重点实验室开放研究项目(编号ZS1314)联合资助成果. （编号YYWT-201713）
