豫西瑶沟金矿床辉钼矿Re-Os年龄及其地质意义
Re-Os Dating for the Molybdenite from the Yaogou Gold Deposit West of Henan Province and Its Geological Significance

周栋 ¹ 赵太平 ² ^* 赵鹏彬 ³ 张晓团 ¹

文摘	瑶沟金矿床位于河南熊耳山地区,属构造蚀变岩型和石英脉型共生的金矿床。利用辉钼矿Re-Os同位素定年方法对瑶沟金矿床4件辉钼矿样品进行了成矿年代学测定,获得的模式年龄为255.69~249.05Ma,加权平均值为(253.0±4.5)Ma,对应的等时线年龄为(255.3±2.8)Ma,模式年龄和等时线年龄在误差范围内基本一致,指示瑶沟金矿床的成矿时限为早三叠世。辉钼矿的w(Re)为2.988×10~(-6)~47.086×10~(-6),指示成矿物质可能主要来源于地壳并有地幔物质的贡献。该矿床是在挤压环境中形成的,在此环境下,携带金等成矿物质的深源流体沿深大断裂即马超营断裂上移,并萃取围岩中的物质,在北东向及近东西向断裂或构造破碎带中沉淀富集成矿。
其他语种文摘	Being composed of typical quartz vein orebodies and structural altered rock-host orebodies,Yaogougold deposit is located at Xiong′ershan region Henan Province.Four molybdenite samples from the Yaogou gold deposit were collected to perform the Re-Os dating.The Re-Os dating yield model ages ranging from 255.69Ma to 249.05Ma with a weighted mean age of(253.0±4.5)Ma,and obtain an isochron age of(255.3±2.8)Ma.Evidently,model ages are consistent with isochron age within the error ranges, so we can constrain the ore-forming age of Yaogou gold deposit at the early Triassic.The molybdenites from the Yaogou deposit have a low content of Re,2.988×10~(-6)~47.086×10~(-6),probably showing the ore-forming materials were mainly from crust but mixed with mantle.The deep source fluids carrying gold and other metallogenic materials moved up along the Machaoying fault and extracted the materials from the surrounding rocks under extrusion setting.Finally,the precipitation of materials in NE,near EW faults or structural fracture zone formed the Yaogou gold deposit.
来源	地质科技情报 ,2018,37(5):162-167 【核心库】
DOI	10.19509/j.cnki.dzkq.2018.0522
关键词	辉钼矿 ; Re-Os同位素定年 ; 瑶沟金矿 ; 豫西 ; 熊耳山地区
地址	1. 陕西省地质调查院, 西安, 710054 2. 中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室, 广州, 510640 3. 陕西省地质调查中心, 西安, 710016
语种	中文
文献类型	研究性论文
ISSN	1000-7849
学科	地质学
基金	国家自然科学基金项目 ; 陕西省公益性地质调查项目
文献收藏号	CSCD:6350031