吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (5): 1405-1418.doi: 10.13278/j.cnki.jjuese.201705106
耿艳光1, 简伟2, 李洪英2, 叶会寿2, 毕珉烽2, 胡乔青2, 李超3, 范成龙1, 王梦琦2
Geng Yanguang1, Jian Wei2, Li Hongying2, Ye Huishou2, Bi Minfeng2, Hu Qiaoqing2, Li Chao3, Fan Chenglong1, Wang Mengqi2
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。
中图分类号:
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