河南祁雨沟金矿田189号矿床流体包裹体与矿床成因研究  

Ore Geology and Fluid Inclusion Constraints on the Origin of the 189~# Deposit in Qiyugou Gold Orefield, Henan Province

作　　者：齐楠 王玭 陈衍景[1] 许强伟 方京 周振菊[3] 闫建明 邓轲[1] QI Nan;WANG Pin;CHEN Yanjing;XU Qiangwei;FANG Jing;ZHOU Zhenju;YAN jianming;DENG Ke(MOE Key Laboratory of Crustal and Orogenic Evolution, Peking University, Beijing 100871, China;CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, Guangdong, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Henan Jinyuan Golden Industry Co., Ltd., Luoyang 471400, Henan, China)

机构地区：[1]北京大学造山带与地壳演化教育部重点实验室,北京100871 [2]中国科学院南海海洋研究所边缘海与大洋地质重点实验室,广东广州510301 [3]中国地质科学院地质力学研究所,北京100081 [4]河南金源黄金矿业有限责任公司,河南洛阳471400

出　　处：《大地构造与成矿学》2019年第3期558-574,共17页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(41630313);中国黄金集团中金资源和河南金源黄金矿业有限公司项目联合资助

摘　　要：河南祁雨沟金矿田189号矿床位于华北克拉通南缘的华熊地块,赋矿岩石为侵位于太华超群斜长角闪片麻岩的似斑状花岗岩。根据脉体穿切关系和矿物交代关系,将流体成矿过程分为4个阶段,其主要矿物组合分别为石英+钾长石±黄铁矿±磁铁矿(Ⅰ)、石英+黄铁矿±辉钼矿±黄铜矿(Ⅱ)、石英+黄铁矿+方铅矿±黄铜矿±金银碲化物(Ⅲ)和石英-碳酸盐(Ⅳ)。石英中发育4种类型流体包裹体:纯CO2包裹体、CO2-H2O包裹体、水溶液包裹体和含子晶多相包裹体。其中,纯CO2包裹体仅在Ⅰ阶段发育。流体包裹体均一温度从Ⅰ阶段380~475℃,经Ⅱ、Ⅲ阶段330~379℃和214~337℃,到Ⅳ阶段110~209℃,逐步降低;包裹体盐度最高值从Ⅰ阶段45.8%~57.9%NaCleqv,经Ⅱ、Ⅲ阶段28.1%~47.0%NaCleqv,到Ⅳ阶段0.5%~9.9%NaCleqv,也呈降低的趋势。据CO2-H2O包裹体估算Ⅰ、Ⅱ阶段流体捕获压力分别为29~70 MPa和24~42 MPa,推测的成矿深度约为2.9 km。因此,祁雨沟189号矿床成矿流体具有高温、富CO2的特征,为浆控高温热液系统的斑岩型金矿床。The 189# deposit in the Qiyugou gold orefield in Henan province is located in the Hua-Xiong Block on the southern margin of the North China Craton. It is hosted in the porphyritic granite intruded in the Archean to Paleoproterozoic amphibolite gneisses of the Taihua Supergroup. The ore-forming process can be divided into four stages marked respectively by quartz + K-feldspar ± pyrite ± magnetite, quartz + pyrite± chalcopyrite ± molybdenite, quartz + pyrite + galena ± gold ± telluride ± chalcopyrite and ore-barren quartz + carbonate veinlets. Four types of fluid inclusions (FIs) are observed in the hydrothermal quartz, including pure CO2 (PC-type), CO2-H2O (C-type), aqueous (W-type), and daughter mineral-bearing (S-type) fluid inclusions. The PC-type FIs only develop in stage Ⅰ, whereas the stage Ⅳ minerals only contain W-type FIs. The FIs in minerals of stages Ⅰ,Ⅱ and Ⅲ are mainly homogenized at temperatures of 380 – 475 ℃, 330 – 379 ℃ and 214 – 337 ℃, with maximum salinities of 45.8%– 57.9% NaCleqv, 28.1%– 47.0% NaCleqv and 0.5%– 9.9% NaCleqv, respectively. The estimated minimum trapping pressures are 29 – 70 MPa in stage Ⅰ and 24 – 42 MPa in stage Ⅱ, respectively, corresponding to an initial mineralization depth of 2.9 km. It is concluded that the fluids forming the 189# deposit are characterized by high temperature, CO2-rich, metalliferous, and magmatic in origin. As supported by the geologic characteristics, the deposit is a porphyry gold system.

关 键 词：矿床地质 流体包裹体 岩浆热液 祁雨沟189号矿床 斑岩型金矿床 

分 类 号：P611[天文地球—矿床学]