青海治多县多彩铜铅锌矿床蚀变矿化分带性与成因类型

发布时间：2018-10-24 15:55

【摘要】：多彩铜铅锌矿床位于"三江"多金属成矿带北段青海省南部的治多县,是目前该地区新发现的唯一一个与古特提斯火山作用有关的大型矿床。矿体产于晚三叠世巴塘群火山岩地层中,直接赋矿围岩为英安质凝灰岩。矿区内主要发育硅化、绢云母化、黄铁矿化、绿泥石化、重晶石化、白云石化、方解石化等蚀变,矿化类型以块状及浸染状铜铅锌矿化和纹层状及星点状铜矿化为主,其次为细脉状铜铅锌矿化等。蚀变矿化在空间上具有明显分带性,以白云石-重晶石固结壳为界,下盘依次出现硅化-重晶石化-块状及细脉状矿化带、硅化-黄铁矿化-稠密浸染状矿化带、黄铁矿化-硅化-绢云母化-稀疏浸染状矿化带、硅化-弱绿泥石化带、绿泥石化带。上盘则多为成矿后中低温蚀变组合,如弱硅化-弱绢云母化-绿泥石化等。成矿演化上,矿床经历了3期主要成矿作用:火山沉积-气液矿化期、海底喷流热液矿化期及表生期。矿床地质特征、蚀变矿化分带及成矿演化等的综合分析表明,多彩铜铅锌矿床与日本黑矿及同一构造带的"三江"中段川西呷村VMS矿床极为相似,属于火山岩容矿的块状硫化物矿床。
[Abstract]:The multicolor copper-lead-zinc deposit is located in Zhiduo County in the southern part of Qinghai Province in the northern section of the Sanjiang polymetallic metallogenic belt. It is the only large deposit newly discovered in this area which is related to the ancient Tethys volcanism. The orebody occurred in the late Triassic Batang Group volcanic strata, and the direct host rock of the ore-bearing rock is dolomite tuff. Silicification, sericite, pyrite, chlorite, barite, dolomitization, calcite and other alteration are mainly developed in the mining area. The main types of mineralization are massive and disseminated copper-lead-zinc mineralization, lamellar and star-spot copper mineralization. Secondly, vein copper, lead and zinc mineralization. Alteration mineralization has obvious zonation in space, with dolomite barite consolidation crust as the boundary, silicitization barite block and veinlet mineralization zone, silicitization pyrite dense disseminated mineralization zone in the lower disc. Pyrite-silicitization-sericite-sparse disseminated mineralization zone, silicitization-weak green mud petrochemical zone, green mud petrochemical zone. The upper plate is mainly composed of medium and low temperature alteration assemblage after mineralization, such as weak silicification, weak sericite and green mud fossilization. In metallogenic evolution, the deposit experienced three main metallogenic stages: volcanic deposition-gas-liquid mineralization period, submarine exhalation hydrothermal mineralization period and supergene stage. The comprehensive analysis of geological characteristics, altered mineralization zoning and metallogenic evolution shows that the multicolor copper-lead-zinc deposit is very similar to the VMS deposit in the west Sichuan of the "Sanjiang" middle section of the same tectonic belt and the Kurokyo deposit in Japan. Massive sulphide deposits belonging to volcanic rocks.
【作者单位】：中国地质大学资源学院;中国黄金集团公司;长江大学地球科学学院;
【基金】：中国地质调查局项目“青海省多彩地区铜多金属矿整装勘查区关键基础地质研究”(科[2014]04-025-081)
【分类号】：P618.4

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