西藏错那县吉松铅锌矿地质特征及找矿标志

Tibet Cuona county lead-zinc mine geological features and prospecting

吉松铅锌矿床位于为喜马拉雅板片拉轨岗日陆隆壳片成矿带内的康马-隆子铜铅锌银成矿带。通过对西藏错那县吉松铅锌矿床地质背景、矿床地质特征、成矿机制和找矿方向的研究,笔者认为矿床成矿地质条件较好。经地表槽探揭露,深部钻探工程控制,发现铅锌矿体呈似层状,矿石品位和厚度沿走向和倾向变化较小,北东向断裂带及其次级断裂为主要的导矿和容矿构造,强蚀变中基性岩脉与炭质板岩的外接触带上,特别是硅化和绿帘石化等蚀变带是矿体有利的富集部位,围岩蚀变强弱与矿化有着密切关系,初步认为矿床为硅化破碎带中低温热液交代型矿床,具有较好的找矿前景。

Jisong lead-zinc deposit in Cona County, Tibet, is located in the crustal block of Lharoi Kangri continental apron of Himalayan plate, belonging to the kangma-longzi copper-lead-zinc-silver metallogenic belt. Based on the geological background, geological features, mineralization mechanisms and prospecting direction of this deposit, the authors consider that the ore-forming geological conditions are relatively favourable. Revealed by surface trenching, deep drilling engineering controls, seam bedded lead-znic deposit occurs, and the ore grade and thickness have less change along the trend and the tendency. The NE-trending fault and its secondary faults are the major ore-transmitting and ore-hosting structures. The extemal contact zone between strongly altered intermediate-basic dykes and carbonaceous slates, especially those silicification and epidotization zones, are conducive to the enrichment of ore bodies, the intensity of wall-rock alteration are closely related to the mineralization intensity. It is suggested that the deposit is a middle-low temperature hydrothermal metasomatic deposit occurred mainly in the silicified fracture zones, and shows fine prospecting potential.