滇东北矿集区云南富乐厂铅锌矿区断裂构造控矿特征及其与成矿的关系

Ore-controlling Characteristics of Fault Structures and Their Relations to Mineralization at Fulechang Zn-Pb Mining District in Deposit Concentration District of Northeastern Yunnan,China

云南富乐厂铅锌矿床是滇东北矿集区东南部的典型矿床之一。在矿区进行大比例尺构造填图的基础上,运用构造成矿动力学的理论和方法,筛选典型断裂构造进行力学性质的鉴定,对不同期次、不同方向的断裂特征进行了系统阐述,初步划分了构造期次,总结了构造体系。认为该区断裂经历了晋宁期—澄江期近东西向的挤压作用,印支期—燕山早期北西-南东向挤压作用及后期燕山中晚期—喜马拉雅期的北东—南西向挤压作用的过程。晋宁—澄江期构造作用为该区成矿提供了有利的地质背景,印支期—燕山早期为该矿成矿主期,北东向压扭性断裂和北西向的扭张性断裂使得流体充填、富集成矿;后期近东西向的扭性断裂为破矿构造。通过矿区构造与成矿关系的研究,为隐伏矿预测与深部勘查提供了依据。

The Fulechang Zn-Pb deposit is one of the typical deposits at the southeastern region in the deposit concentration district of Northeastern Yunnan. In this paper,the geological characteristics for faults of different trends and phases and their relations to mineralization have been systematically elucidated based on large-scale mapping and the dynamics theory and method of tectonic ore-forming processes. Typical faults are selected for identification of the mechanical nature of fault planes and for division into tectonic episodes and tectonic systems.The area experienced EW-trending compressive stress from the Jinning period to the Chengjiang period,NW- SEtrending extrusion from the Indosinian period to the early Yanshanian and NE- SW-trending tectonic process from the mid-late Yanshanian to the Himalayan period. At first,the primary stress process from the Indosinian to the early Yanshanian provided a favorable metallogenic geological background; and NE-trending compressional-shearfaults and NW-trending tensional faults twist made metallogenic fluid filling,enrichment and mineralization; then EW-trending shear faults are ore-breaking structure. Based on the relationship between structure and mineralization,the research provides important evidences for forecasting concealed deposits or ore-bodies.