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作 者:唐平 周兵 李迅哲 路波 Tang Ping;Zhou Bing;Li Xunzhe;Lu Bo(Sichuan Jinsheng Mining Co. , Ltd.;No. 108 Geological Team, Sichuan Bureau of Geology & Mineral Resources)
机构地区:[1]四川金升矿业有限责任公司 [2]四川省地质矿产勘查开发局一0八地质队
出 处:《现代矿业》2017年第11期50-54,共5页Modern Mining
基 金:四川省煤炭产业集团有限责任公司地质调查项目(编号:CMDZKC2015-1)
摘 要:阿色金矿床位于横断山脉北段,金沙江上游东岸,构造位置位于松潘—甘孜地槽褶皱系、义敦优地槽褶皱带之义敦地向斜。分析了区域成矿地质背景、矿区及矿床地质特征,讨论了矿床成因,并系统总结了地球化学、构造、蚀变、露头等找矿标志。研究表明:(1)阿色金矿床总体受F2韧性剪切带控制,该韧性剪切带控制可产生剪切变质成矿热液及递进变形的容矿脆性构造,使含金建造改造成矿,初步形成小规模的金矿床和矿化集中区;(2)韧性剪切作用增强了岩石的活性和渗透性,提供了成矿物质和流体运移通道,便于在剪切活动消失期及以后流经其中的各类流体浸取成矿物质,进而沿高渗透性韧性剪切带上升至浅部有利部位富集成矿;(3)矿区内的(隐伏)中酸性—基性岩脉、基性—超基性岩体的侵位活动,为地层中成矿元素活化迁移提供了热动力条件,使得热液被运移至断裂压扭破碎部位富集成矿;(4)阿色金矿床属于在区域变质形成的热液作用下,与韧—脆性剪切带在时空分布上有关的构造蚀变岩型金矿床。Ase gold deposit is located in the north of Hengduan Mountains and the east of the upstream of Jinsha River,its tectonic location is distributed in Yidun syncline of Yidun eugeosyncline fold belt of Songpan-Ganzi geosyncline. Through the analysis of regional geological metallogenic background,geological characteristics of the mining area and deposit,the deposit genesis is discussed,besides that,the prospecting indicators are summarized systematically from the aspects of geochemical,structure,alteration and outcrop. The study results show that:(1)Ase gold deposit is generally controlled by F2 ductile shear zone,the shear metamorphic metallogenic hydrothermal fluid and the ore-hosting brittle structures can be produced by the controlling of ductile shear zone,the metallogenesis of the gold-bearing formation is produced,so the gold deposits with small scale and gold ore-concentration areas are formed;(2)the rock activity and permeability are enhanced by ductile shearing,the migration channel of metallogenic material and metallogenic fluid are provided,so as to facilitate the future flows through all kinds of fluids which leaching into the minerals in the shear activity period and then disappear,the metallogenic materials is upper migrated along the high permeability ductile shear zone to the shallow metallogenic favorable position;(3)the thermodynamic condition of metallogenic elements activation and migration in strata by the emplacement activities of( insidious) intermediate acidic mafic veins and basic-ultrabasic rock mass,therefore,the metallogenic activities is produced by the migration of metallogenic fluids to the fracture pressure torsion broken parts;(4)Ase gold deposit genesis is belongs to the tectonic altered-rock type gold deposit related to the spatial distribution of ductile-brittle shear zone under the action of the hydrothermal fluids formed by regional metamorphism. The above analysis results related to the geological characteristics,genesis and prospecting indicators of Ase g
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