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现代地质 ›› 2012, Vol. 26 ›› Issue (5): 1078-1085.

• 地球化学 • 上一篇    下一篇

河南内乡县许窑沟金矿地质特征及成矿过程

 李泳泉1, 张德会1, 李胜利2, 姚娟2, 王丽娜2, 王建明2   

  1. 1 中国地质大学 地球科学与资源学院,北京100083;2 河南省地质矿产勘查开发局 第一地质勘查院,河南 南阳473000
  • 收稿日期:2012-05-25 修回日期:2012-09-02 出版日期:2012-10-19 发布日期:2012-10-23
  • 作者简介:李泳泉,男,讲师,1982年出生,地球化学专业,主要从事地球化学的教学与科研工作。Email: lyq@cugb.edu.cn。
  • 基金资助:

    河南省地质科技攻关项目“豫西南湍源银多金属地球化学异常区成矿特征与找矿预测”(0880)。

Geological Characteristics and Oreforming Process of Xuyaogou Gold Deposit in Neixiang County,Henan Province

 LI  Yong-Quan-1, ZHANG  De-Hui-1, LI  Qing-Li-2, TAO  Juan-2, WANG  Li-Na-2, WANG  Jian-Meng-2   

  1. 1 School of Earth Sciences and Resources,China University of Geosciences,Beijing100083,China; 2 The First Geo-Exploration Institute of Henan Provincial Bureau of Geo-Exploration and Mineral Development,Nanyang,Henan473000,China
  • Received:2012-05-25 Revised:2012-09-02 Online:2012-10-19 Published:2012-10-23

摘要:

河南许窑沟金矿位于东秦岭造山带朱阳关—夏馆断裂和瓦穴子—乔端断裂共同控制的二郎坪群地层中,矿体主要产于牧虎顶花岗岩岩体与火神庙组接触带中。矿石分为石英脉型和蚀变岩型2类,矿体围岩蚀变发育,蚀变类型较多,主要有硅化、绢云母化、绿泥石化、钾化、碳酸盐化、黄铁矿化、赤铁矿化。含矿石英脉主要包裹体类型包括富气和H2O-NaCl-CO2三相包裹体,成矿期的均一温度主要为310~350 ℃,盐度一般为2%~7%;成矿晚期均一温度主要为300~340 ℃,盐度为10%~15 %。综合分析认为,许窑沟金矿成矿过程比较复杂,成矿过程中有沸腾作用,同时又存在大气水和岩浆水混合作用,为构造破碎带型的金矿。

关键词: 河南内乡县, 许窑沟金矿, 地质特征, 流体包裹体, 成矿模式

Abstract:

 Xuyaogou gold deposit is located in Erlangping Group stratum and controlled by ruptures of Zhuyangguan Xiaguan and Waxuezi Qiaoduan in east Qinling orogenic belt. The orebody is mainly located in the contact zone of Muhuding granite and Huoshenmiao Formation stratum. Gold ore can be divided into two type including quartz vein and alteration. Wall rock develop many types of alteration,such as silicification,sericitic alteration,chloritic alteration,potassic alteration,carbonatic alteration,pyrite and hematite alteration. The fluid inclusions in ore-bearing quartz vein mainly include gas rich and H2O-NaCl-CO2; homogenization temperature  are from 310 to 350 ℃, and salinity is from 2% to 7% in ore-forming period; homogenization temperature are from 300 to 340 ℃, and salinity is from 10% to 15% in late ore forming period. The ore-forming process of Xuyaogou gold deposit is very complicated,and boiling and mixing of meteoric water and igneous water occures in the ore forming period. Through comprehensive analysis,Xuyaogou gold deposit is a tectonic fragmentized belt type of gold deposit.

Key words:  Neixiang County,Henan Province, Xuyaogou gold deposit, geological characteristics, fluid inclusion, oreforming mode