中条山篦子沟铜矿辉钼矿铼-锇同位素年龄及其地质意义

发布时间：2018-05-22 14:42

本文选题：Re-Os同位素年龄 + 胡-篦型铜矿田　；参考：《吉林大学学报(地球科学版)》2017年05期

【摘要】：篦子沟铜矿位于山西中条山胡-篦型铜矿田,矿体与地层产状一致,呈层状、似层状分布于中条群篦子沟组和余元下组中,经历了多期次多阶段成矿作用。为限定篦子沟铜矿后期热液脉状矿化的形成时代,对篦子沟铜矿区方解石-石英脉中与黄铜矿共生的辉钼矿样品进行了Re-Os同位素测定。结果表明,6件辉钼矿样品Re-Os同位素模式年龄为(1 539±26)~(1 616±26)Ma,加权平均年龄为(1 577±31)Ma(MSWD=5.5),等时线年龄为(1 522±180)Ma(MSWD=9.6),表明热液脉状矿化形成于中元古代长城纪晚期。据此篦子沟铜矿的热液脉状矿化可分为3个成矿期次,分别为古元古代晚期发生的微细脉浸染状矿化期、脉状矿化期和中元古代早期热液脉状辉钼矿矿化期。此次事件可能为中元古代伸展-裂解事件岩浆侵位产生的热液对原来的篦子沟铜矿进行再次的矿化、富集。结合已有资料,证明篦子沟以及中条山地区在中元古代早期存在热液矿化事件。
[Abstract]:The Bizigou copper deposit is located in the Hu-Be type copper deposit of Zhongtiaoshan, Shanxi Province. The orebody is consistent with the stratigraphic occurrence and is layered. It is distributed in the Baizigou formation of Zhongtiao Group and the Yuyuanxia formation, and has undergone multi-stage and multi-stage mineralization. In order to limit the forming time of hydrothermal vein mineralization in the late stage of Bizigou copper deposit, the molybdenum samples in calcite quartz vein of the Bizigou copper deposit were determined by Re-Os isotope. The results show that the Re-Os isotopic model age of 6 molybdenum samples is 1 539 卤26 616 卤26 Ma, the weighted average age is 1 577 卤31 Ma, and the isochron age is 1 522 卤180 Ma MSD 9. 6, indicating that hydrothermal vein mineralization took place in the late Mesoproterozoic the Great Wall. According to this, the hydrothermal vein mineralization of Bizigou copper deposit can be divided into three metallogenic stages: microvein disseminated mineralization, vein mineralization and early Mesoproterozoic hydrothermal vein molybdenum mineralization. This event may be the Mesoproterozoic extension-pyrolysis event of magma emplacement generated by hydrothermal remineralization and enrichment of the original Bizigou copper deposit. It is proved that hydrothermal mineralization occurred in the early Middle Proterozoic in Baizigou and Zhongtiaoshan areas.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质科学院矿产资源研究所/国土资源部成矿作用与资源评价重点实验室;国家地质实验测试中心;
【基金】：国家自然科学基金项目(41602074) 中国地质调查局项目(DD20160124) 中央级公益性科研院所基本科研业务专项(YYWF201510)~~
【分类号】：P618.41

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