云南者桑金矿构造控矿规律及找矿方向

Ore-controlling Structure and Prospecting Direction of Zhesang Gold Deposit in Yunnan Province

为进一步探明云南者桑金矿构造控矿规律及找矿方向,通过野外实地调查,综合分析者桑金矿矿床地质特征和控矿构造特征,认为矿区主要有NE向断裂构造控矿、次级褶皱构造控矿、岩体接触带构造控矿3种控矿构造类型。这些控矿构造为该区金矿床的形成提供了热源、驱动力、运移通道和富集空间。矿区经历了多次构造演化,主要有加里东期运动、印支期运动和燕山—喜山期构造活动,使得控矿构造具有多期活动性,使成矿元素多次被活化,导致成矿作用的叠加是者桑微细粒浸染型金矿床的典型特征。根据者桑金矿的构造控矿特征,下一步找矿工作应围绕与NE向断裂近于平行的断裂破碎带、次级褶皱膨胀带和岩体接触带、断裂深部进行,尤其石英发生的二次碎裂是良好的成矿标志。

In order to further prove the ore-controlling structure and prospecting direction of Zhesang Gold Deposit in Yunnan Province, the ore-controlling structural feature and geological characteristics are analyzed based on the outdoor investi- gation. According to the analysis results, there are three main types of ore-controlling structure in Zhesang gold deposit ： NE- trending faults, secondary folds and contact zone. These ore-controlling structures provide heat, driving force,, migration pathways and enrichment space for the reformation of gold deposit in the area. The mining area has experienced several tectonic evolu- tions, such as Caledonian movement, Indosinian movement and Yanshan-Himalayan tectonic activity. These make the control- ling structures with multi-stage activity and the ore-forming elements activated repeatedly. So the superimposed mineralization becomes the typical feature of Zhesang gold deposit. According to the characteristics of the ore-controlling structure, the fault zone, secondary folds swell band, contact zone and parallel with NE-trending fault should be focused in further prospecting work. In particular, the secondary fragmentation of quartz is the fine sign of mineralization.