摘要
前河金矿床产于中元古界长城系熊耳群火山岩内的区域断裂蚀变带中,平面上呈线状分布;矿体形态呈不规则脉状、豆荚状,沿走向及倾向具膨缩、分枝现象;矿体近东西走向,倾向北东,平均67°,总体为陡倾斜脉状矿床。成矿阶段即为矿物生成阶段,共划分为钾长石阶段、黄铁矿-石英阶段、自然金-石英(绢云母)-黄铜矿-黄铁矿阶段、自然金-多金属硫化物阶段以及碳酸盐阶段五个阶段,其中最主要的成矿阶段为第三阶段。当矿体中大量出现方解石脉时即预示着成矿基本结束。矿石中金的主要载体矿物为黄铁矿,少为黄铜矿及方铅矿,脉石矿物主要为石英及绢云母。矿床的矿化蚀变类型主要有钾化、硅化、黄铁绢英岩化、绿帘石化、绿泥石化、绢云母化等,其中硅化和黄铁绢英岩化与金矿化最为密切。
The qianhe gold deposit is located in the middle proterozoic in the regional faulted alteration zone of the volcanic rocks of the Great Wall system of the xionger group, itzs a linear distribution on the plane.The shape of ore bodies is irregular veins and pods, with swelling, shrinkage and branching along the strike and tendency. The ore body is nearly east-west trending with an average of 67 degrees to the north-east and is generally a steep dip vein deposit. Mineralization stage is the stage of mineral formation, which is divided into five stages: potash feldspar stage, pyrite-Shi Ying stage, native gold-Shi Ying (sericite)-chalcopyrite-pyrite stage, native gold -poly metalli c sulfide stage and carbonate stage, the most important of which is the third stage. When a large number of calcite veins appear in the ore body, it indicates the basic end of mineralization. The main carrier minerals of gold in the ore are pyrite, less chalcopyrite and galena, and the gangue minerals are mainly Shi Ying and sericite. Mineralization and alteration types of the deposit mainly include potassium mineralization, silicification ,sericitization of yellow iron, epidoteization, chloritization and sericitization, among which silicification and sericitization of yellow iron are most closely related to gold mineralization.
作者
周胜兴
付恒一
王璇
刘冰
ZHOU Sheng-xing;FU Heng-yi;WANG Xuan;LIU Bing(The First Geological Survey Institute of Geological and Mineral Exploration and Development Bureau of Henan Province, Zhengzhou 450000,China;The Second Geological Survey Institute of Geological and Mineral Exploration and Development Bureau of Henan Province, Zhengzhou 450000,China)
出处
《甘肃冶金》
2019年第3期52-59,共8页
Gansu Metallurgy
关键词
深大断裂
金矿床
构造蚀变岩型
地质特征
成矿阶段
蚀变类型
deep fault
gold deposits
structural alteration rock type
geological characteristics
metallogenic stage
alteration type
