豫西熊耳山矿集区祁雨沟斑岩型金矿床地质特征及找矿意义

Geological characteristics and prospecting significance of Qiyugou Porphyry Gold Deposit in the Xiong’ ershan high ore concentration district,Western Henan Province

祁雨沟金矿床位于熊耳山矿集区中部,目前在熊耳山矿集区已发现4种金矿床类型,斑岩型金矿床为其中之一。斑岩型金矿床目前在祁雨沟金矿区内仅发现了189矿体,该矿体赋存于燕山期花岗岩复合岩体中,主矿体产于祁雨沟400 m水平以下细粒花岗岩复合岩体深部的角砾化、硅化核顶部,其他支矿体以脉状、网脉状产出。矿体围岩蚀变极为发育,硅化、黄铁矿化、钾长石化及黑云母化与金矿化关系密切。斑岩型金矿床受花岗岩复合岩体和蚀变带控制,二者可作为最主要的找矿标志。根据祁雨沟金矿床的成矿地质背景、矿区地质特征及物化探异常特征等方面的综合研究,认为矿区范围在现有矿体的深部和外围具有较大的资源潜力。

The Qiyugou Gold Deposit is located at the central segment of the Xiong’ershan high ore concentration district. At present,four types of gold deposits have been discovered in the Xiong’ ershan high ore concentration district,in which porphyry gold deposit is one important type. The porphyry gold deposit is represented solely by the 189 ore bodies in Qiyugou Gold District which occur in the Yanshanian granite composite pluton. The main ore body occurs at the top of the brecciated and silicified cores of the fine-grained granite composite pluton below the level of 400 m,and other branch ore bodies occur as veins and stockworks. The wall rock alterations of ore body are well developed,and silicification,pyritization,potassic alteration and biotization are closely related to gold mineralization. The porphyry gold ore body is controlled by the granite composite pluton and wall rock alteration zone,which can be regarded as the major prospecting indicator. According to the comprehensive study of geological background,the geological and physicochemical characteristics of Qiyugou Gold Deposit,the prediction is that the deep level and periphery of the existing ore bodies might have great resource potential.