| 猫岭金矿床成矿构造演化特征 |
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| 引用本文：.2004.Evolution Features of Metallogenic Structure in Maoling Gold Deposit[J].Mineral Deposits,23(2):198~205 |
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| 基金项目:国家自然科学基金项目(40072034) |
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| 中文摘要: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?000～2?200 Ma。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，免遭后期的构造_岩浆热事件的改造和破坏。 |
| 中文关键词:地质学 猫岭金矿 辽河旋回 构造面理 毒砂 古元古代 |
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| Evolution Features of Metallogenic Structure in Maoling Gold Deposit |
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| Abstract: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 vei ns, its gold veins are siliceous altered quartz veins containing arsenopyrite, p yrrhotite and pyrite. The S1 foliation and the gold veins were formed in the s ame tectonic stage, that is, in the decollement stage of the first structural ep isode in the Liaohe tectonic cycle. The gold metallogenic epoch is paleoprot erozoic, 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 ev ents in post_mineralization periods and preserved such paleoproterozoic metallog enic features of the Maoling deposit as its ore minerals, structures and texture s of ores, lead and Re-Os isotopic compositions, and the S1 foliation of the first structural episode in the Liaohe tectonic cycle. |
| keywords:geology, Maoling gold deposit, Liaohe tectonic cycle, struct ural foliation, arsenopyrite, paleoproterozoic |
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