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澜沧裂谷北段中部偏南的大黑山勘查区保存有不同于老厂银铅锌多金属矿床的热液蚀变体系,是澜沧裂谷盆地岩浆热液蚀变体系的重要组成部分。初步的研究表明:(1)大黑山勘查区的早石碳地层为南段组碳质凝灰质碎屑岩,硅质热液在南段组中形成细网脉状石英脉(二号平巷);裂谷盆地中心早石碳地层为依柳组玄武质火山岩,斑岩岩浆热液在玄武岩中形成不同组合的夕卡岩。二号平巷石英脉的矿化元素配分具有与老厂深部蚀变斑岩相似的Pb-Bi-Ag-Zn-Cu
The Lancang rift basin is characterized by a hydrothermal alteration system different from that of the Laozhang silver-lead-zinc polymetallic deposit in the Daheishan exploration area south of the central part of the northern Lancang rift valley. It is an important part of the hydrothermal alteration system in the Lancang rift basin. Preliminary studies show that: (1) The Early Carboniferous strata in the Daheiyama prospecting area are carbonaceous tuffaceous clastic rocks in the southern section, and the siliceous hydrothermal formed fine vein vein quartz veins in the southern section ); Early Carboniferous strata in the center of the rift basin are basaltic volcanic rocks in the Yiliu Formation, and porphyry magmatic hydrothermal fluids form different combinations of skarn in basalts. The mineralization elemental composition of No.2 alluvial quartz vein has the similar Pb-Bi-Ag-Zn-Cu