新疆和田县红黄岭铅锌矿成矿特征

Metallogenic Characteristics of Lead-Zinc Ore in Honghuangling,Hetian County,Xinjiang

新疆和田县红黄岭铅锌矿位于火烧云超大型铅锌矿外围,产于上三叠统克勒清河组地层中。矿体受构造控制,以脉状产出。矿石矿物主要为闪锌矿和方铅矿,伴生银。矿石矿物多以团块状、角砾状、脉状产出。方铅矿中铅同位素构造环境判别图显示铅来源于下地壳。石英中δD_(V-SMOW)=-89.7‰~-74.7‰,δ^(18)O_(V-SMOW)=11.8‰~18.3‰,显示成矿热液为岩浆水与地下水的混合。成矿物质来源可能与晚侏罗世-早白垩世陆陆碰撞产生的下地壳增厚重融有关,成矿热液沿河尾滩深大断裂上升,在次级断裂及成矿有利部位沉淀。今后找矿思路应优先考虑构造有利部位,特别是北东向构造,进行构造专题研究。

The Honghuangling lead-zinc deposit of Hetain county,Xinjiang is located in the periphery of the Huoshaoyun super large lead-zinc deposit and occurs in the Keleqinghe Formation of Upper Triassic.Its ore bodies are controlled by structure,and occur in vein shape.The ore minerals are dominated by galena and sphalerite companied with silver.The ores are mostly of block,breccia and vein shapes.The environmental discriminant diagram of lead isotope shows that the lead originated from the lower crust.The quartz has δD_(V-SMOW)=-89.7~-74.7‰ and δ^(18)O_(V-SMOW)=11.8~18.3‰,indicating that the ore-forming hydrothermal is mixture of magmatic water and groundwater.The provenance of lead is probably related to the thickening and thawing of the lower crust caused by the late Jurassic-early Cretaceous continental collision.The ore-forming hydrothermal fluid rose along the deep and large faults and deposited at secondary faults and the favorable metallogenic sites.In the future ore-search should give priority to favorable structural sites especially NE-trending structures and special research on these structures should be conducted.