黔东柏松铅锌矿床矿物特征及地质意义

凯里柏松是黔东地区的代表性铅锌矿床，但研究程度较低。利用矿相显微镜和TIMA对其开展了详细的矿物学研究。结果表明，柏松铅锌矿床矿石矿物主要为闪锌矿、方铅矿和菱锌矿，脉石矿物主要为白云石和少量沥青；矿石具有角砾状、脉状、浸染状、团块状、斑杂状、蜂窝状和星点状构造，以自形、半自形、他形和交代结构为主；围岩蚀变主要为白云石化，其次为沥青化，少量黄铁矿化和方解石化；矿床以硫化矿为主，但近地表的含矿层发生了一定的氧化。矿石及矿物特征表明矿床的形成经历了三个时期，即：在沉积-成岩期发生了成矿物质的预富集作用，在成矿期发生了广泛的热液活动并沉淀了大量的铅锌金属硫化物和白云石，在表生期的近地表环境发生了矿石的氧化作用。该矿床的成矿温度较低，油气有机质可能参与了成矿作用，其属于MVT矿床。该研究有助于指导后期矿产勘查和矿物资源综合利用。

Mineral characteristics of Baisong Pb-Zn deposit in eastern Guizhou province and their geological significance

The Baisong deposit in Kaili is a representative Pb-Zn deposit in eastern Guizhou province, but its research is relatively weak. In this paper, the mineralogical study of this deposit was carried out in detail using an ore microscope and TIMA. The results show that the ore minerals of the Baisong Pb-Zn deposit are mainly sphalerite, galena, and smithsonite, while the gangue minerals are mainly dolomite and a little bitumen. The ores are characterized by brecciform, vein-like, disseminated, massive, variegated, honeycomb, and stellate structures, and mainly consists of hypidiomorphic to automorphic, allotriomorphic, and metasomatic texture. The wall rock alterations near the ore body are mainly dolomitization, followed by bituminization, a small amount of pyritization, and calcilization. The ore deposit is dominated by sulfide ore, but some oxidation has occurred near the surface of the ore bearing layers. The characteristics of the ore and mineral indicate that the deposit has experienced three epochs: (1) pre-enrichment of ore-forming materials occurred in the sedimentary-diagenetic epoch; (2) extensive hydrothermal activity occurred in the ore-forming epoch and a large amount of lead-zinc sulfide and dolomite precipitated, and (3) ore oxidation occurred in the near-surface environment in the supergene epoch. The mineralization temperature of this deposit is low, and the organic matter of oil and gas may be involved in the mineralization, and it belongs to the MVT deposit. This research is in helping to guide the later exploration of lead-zinc minerals and comprehensive utilization of mineral resources in this deposit.