多民族玻利维亚国北奇查斯市锑多金属矿地质特征及矿床成因

Geological Characteristics and Genesis of the Vitichi Sb Deposit in Potosi,Plurinational State of Bolivia

勘查区位于南美洲的东科迪勒拉古生代褶皱带内,属受断裂构造控制的中低温热液脉状多金属矿床。矿体分布在褶皱构造的轴部或翼部的层间破碎带中。本文通过野外地质勘查,对勘查区的地质特征及其矿床成因进行分析,计算出矿石量18.14万吨。勘查区矿石类型为硫化物型,矿石矿物主要为辉锑矿、方铅矿、闪锌矿、褐铁矿,以辉锑矿为主。成矿物质来源于深部岩浆热液,板块俯冲产生了岩浆活动,岩浆衍生的结晶分异导致Sn和W的富集,随着远离岩体,温度逐渐下降,中低温组合元素Sb-Pb-Zn-Ag在褶皱构造的轴部或翼部的层间破碎带中等成矿有利地段富集成矿。这对进一步扩大勘查区的找矿远景具有重要的指导意义,同时对海外矿产勘查工作具有借鉴意义。

The exploration area is located in South America, Eastern Cordillera in Paleozoic fold belt, Is the low temperaturehydrothernaal vein controlled by faults polymetallic deposit. The ore body is located in fold axis or the flanks of the interlayer fracture zone. This paper based on the field geological exploration, This work analyses the geological features and genesis of the ore deposits in the exploration area, Get 181 thousand and 400 tons of ores. The ore type of the exploration area is massive sulfide, The ore minerals include gatena,sphalerite, limonite, stibnite, and the main ore mineral is stibnite. The source of ore-forming materials from deep magma, Subduction of the continental plate produced magmatic activity, Crystallization differentiation of magma lead to the enrichment of Sn and W, As far away from the rock mass, the temperature gradually decreased, The combination of elements in low temperature Sb-Pb-Zn-Ag enrichment and mineralization, formed in the fold axis or the flanks of the interlayer fracture zone and other favorable position. This has an important guiding significance for the further expansion of the prospecting area of the prospecting potential, while the overseas mineral exploration work has reference significance.