投稿时间：2012-09-27
修订日期：2013-07-24
网络发布日期：2013-10-29
中文摘要:为了查明山西刁泉银铜多金属矿床矿化发生的时间,作者采集了6件辉钼矿样品进行Re-Os同位素测试,获得等时线年龄为(131.9±2.9) Ma, MSWD=1.7,样品的加权平均年龄为(132.01±0.85) Ma,MSWD=1.05,略晚于矽卡岩型铜矿化形成的时间。山西刁泉银铜矿床成矿地质年龄,与晋东北地区燕山期火山-次火山岩形成的时间基本相同,说明次火山岩体与成矿关系密切,次火山岩体为刁泉银铜矿床的形成提供了成矿物质和热源。刁泉银铜矿床的形成时间与华北地台大规模成矿时代一致,形成于板内构造环境,为华北地台深部岩石圈减薄背景下古老造山带活化的产物,形成于华北地台东部构造体制转换时期。
中文关键词:地球化学 辉钼矿 Re-Os年龄 同位素 银铜矿 山西刁泉
Abstract:In order to date the metallogeny of the Diaoquan silver-copper polymetallic deposit, the authors selected and analyzed six molybdnite samples from this ore deposit. The Re-Os isotopic model ages range from 130.5 Ma to 132.8 Ma,with an isochron age of (131.9±2.9) Ma(MSWD=1.7) and an weighted average age of (132.01±0.85) Ma(MSWD=1.05). The molybdnite was formed at 132 Ma, later than the formation of copper minerals. The rock-forming and ore-forming processes of the Diaoquan silver-copper polymetallic deposit took place simultaneously with the Yanshanian volcanic and subvolcanic activities in northeastern Shanxi, which suggests that the sub-volcanic rocks had close relationship with metallogeny and provided metallogenic matter and heat for the Diaoquan silver-copper deposit. The Diaoquan silver-copper polymetallic deposit was formed during the large-scale metallogenic activity in the northeast platform and occurred in a continental intraplate tectonic setting. As a result of re-activation of ancient orogeny under the background of thinning of the deep lithosphere, the Diaoquan deposit was formed during the transformation of tectonic regime in the east of the northeast platform.
文章编号：
中图分类号：P618.52;P618.41
文献标志码：
基金项目:本文得到国家危机矿山"晋东北-内蒙古中部地区火山岩型金多金属矿床成矿规律总结研究"(项目编号: 20089925)项目的资助
引用文本：
牛翠祎,卿敏,唐明国,李超,张玉杰,李艳秋.2013.山西刁泉银铜多金属矿床辉钼矿Re-Os同位素年龄及其地质意义[J].矿床地质,32(5):972~978NIU CuiYi,QING Min,TANG MingGuo,LI Chao,ZHANG YuJie,LI YanQiu.2013.Molybdnite Re-Os age of Diaoquan silver-copper polymetallic deposit in Shanxi Province and its geological significance[J].Mineral Deposits32(5):972~978
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