摘要
猫岭金矿是在克拉通变质岩区保存较好的含砷 (毒砂 )浸染型金矿之一 ,金矿脉并非单纯的硫化物脉 ,而是含毒砂_磁黄铁矿_黄铁矿的硅化石英脉 ,S1 面理与金矿脉为同一构造期产物 ,形成于辽河旋回第一幕构造的伸展滑脱阶段。金矿成矿时代为古元古代 ,绝对年龄为 2 0 0 0～ 2 2 0 0Ma。在金矿成矿期形成的强硅化蚀变圈 ,因具有不透水性和强硬的岩石力学性质 ,造成封闭_半封闭的屏蔽环境 ,使得猫岭金矿的古元古代成矿特征 ,包括矿石矿物组成、结构构造、铅同位素和铼_锇同位素组成 ,以及辽河旋回早期的S1 面理得以保存下来 。
The Maoling deposit is a well reserved arsenic-bearing disseminated gold deposit in the metamorphic rock area of the craton. Instead of being simple sulfide veins, its gold veins are siliceous altered quartz veins containing arsenopyrite, pyrrhotite and pyrite. The S 1 foliation and the gold veins were formed in the same tectonic stage, that is, in the decollement stage of the first structural episode in the Liaohe tectonic cycle. The gold metallogenic epoch is paleoproterozoic, with an age of 2?000～2?200 Ma. The intense siliceous alteration zone formed during gold mineralization is characterized by impermeability and strong rock mechanics. This has built up a closure or semi-closure shield circumstance against the overprinting and destroying actions of tectonic-magmatic thermal events in post-mineralization periods and preserved such paleoproterozoic metallogenic features of the Maoling deposit as its ore minerals, structures and textures of ores, lead and Re-Os isotopic compositions, and the S 1 foliation of the first structural episode in the Liaohe tectonic cycle.
出处
《矿床地质》
CAS
CSCD
北大核心
2004年第2期198-205,共8页
Mineral Deposits
基金
国家自然科学基金项目 ( 4 0 0 72 0 3 4)的资助
关键词
地质学
猫岭金矿
辽河旋回
构造面理
毒砂
古元古代
geology, Maoling gold deposit, Liaohe tectonic cycle, structural foliation, arsenopyrite, paleoproterozoic
