云南镇康地区芦子园铅锌矿床控矿因素浅析

镇康芦子园矿床经初步评价为一大型铅锌多金属矿床,属于早期沉积(火山沉积)、后期热液改造的热液型矿床。矿体主要赋存于镇康复背斜北西翼的次级芦子园背斜的晚寒武世沉积地层中,是由晚寒武世的沉积成岩作用局部形成富含Pb、Zn、Cu、Ag等元素,后期经区域浅变质作用,特别是区内岩浆影响下的热变质和热液交代作用使元素发生迁移、富集而形成的,构造和层位等控矿明显,热液蚀变是区内找矿标志之一。矿体形成与矽卡岩化、硅化、大理岩化、磁铁矿化等蚀变有关,成矿与构造、深部断裂、岩浆活动、成矿热液活动密切相关。

A tentative analysis of the ore-controlling factors of the Luziyuan lead-zinc deposit in Zhenkang area, Yunnan

The Luziyuan ore deposit in Zhenkuang County was preliminarily evaluated as a large-size lead-zinc polymetallic deposit, which experienced deposition in the early period and hydrothermal transformation in the late period, thus belonging to hydrothermal type. Ore bodies occur mainly in Late Cambrian sedimentary strata on the western limb of Zhenkang anticline. Late Cambrian sedimentation and diagenesis caused local enrichment of such elements as Pb, Zn, Cu and Ag, and subsequent regional epimetamorphism, especially thermal metamorphism and hydrothermal metasomatism under the influence of regional magmatic activity, caused the migration and enrichment of these elements to form the ore deposit. Structures and horizons obviously control the ore bodies, and hydrothermal alteration is one of the ore-prospecting indicators. The formation of the ore bodies was related to such alternations as skarnization, silicification, marbleization and magnetitization, and the mineralization was intimately related to structures, deep faults, magmatism and ore-forming hydrothermal activities.