青海省都兰县阿斯哈金矿矿床地质特征及成矿浅析

青海省都兰县阿斯哈金矿位于东昆仑造山带东段,受区域复杂的地质构造演化影响,区内构造极为发育,具有多期多阶段特征,区内构造以断裂构造为主。主要发育NW向、NE向、SN向、EW向四组。其中NE向、SN向断裂是区内主要的控矿、赋矿构造,EW向断裂与区域上深大断裂呈平行产出,主要为破矿构造。矿体主要形成于花岗岩体内构造蚀变岩带内,蚀变规模也直接影响着金矿床规模的大小。矿体在倾向及走向上可见明显的尖灭再现、分枝复合的特点,在收缩复合部位由于受到多期成矿流体物质叠加扰动,因此对成矿物质聚集极其有利。本文通过介绍区域地质背景、矿区地质特征及成矿演化对阿斯哈金矿矿床地质特征及成矿条件进行简要分析。

Geological Characteristics and Metallogenic Analysis of Asiha Gold Deposit in Dulan County,Qinghai Province

Asiha gold deposit located in the eastern section of the Kunlun orogenic belt of Dulan county,Qinghai province,influenced by the complex geological structure evolution in the region,the structure is extremely developed with multi-stage characteristics,and mainly are faulted.The four groups are NW,NE,SN and EW.The NE and SN trending faults are the main ore-controlling and bearing structures,while the E-W trending faults are the main ore-breaking structures.While EW faults and deep and large faults in the region are produced in parallel.The ore body is mainly formed in the structural alteration zone of granite,and the alteration scale also directly affects the size of gold deposit.The ore-body has obvious characteristics of expansion and contraction and branch recombination,and the recombination is disturbed by multi-phase superposition of fluids,which is conducive to the accumulation of gold mineralizing materials.This paper briefly analyzes the geological characteristics and metallogenic conditions of Asiha gold deposit by introducing the regional geological background,geological characteristics of the mining area and metallogenic evolution。