金厂特大型金矿床的地质特征与成因研究  

Geology and Genesis of the Superlarge Jinchang Gold Deposit

作　　者：贾国志 陈锦荣 杨兆光 边红业 王艳忠 梁海军 金同和 李振辉 

机构地区：[1]武警黄金部队第一总队,哈尔滨150086 [2]武警黄金部队地质研究所,廊坊065000 [3]武警黄金部队第一支队,牡丹江157000 [4]武警黄金部队第三支队,哈尔滨150049

出　　处：《地质学报》2005年第5期661-670,共10页Acta Geologica Sinica

摘　　要：金厂特大型金矿床产于吉黑东部兴凯地块太平岭隆起与老黑山断陷的交接部位,矿区外围出露新元古界黄松群变质岩系。本区燕山期岩浆活动可分为5期,分别为燕山早期第一阶段闪长岩(δ52-1)、燕山早期第二阶段文象花岗岩(γo52-2)、燕山早期第三阶段花岗岩(γ52-3)、燕山晚期第一阶段花岗斑岩(γπ53-1)、燕山晚期第二阶段闪长玢岩脉(δμ53-2),形成岩浆穹窿型构造和隐爆角砾岩筒构造,并叠加大规模的热液蚀变活动,金矿化与第4、5期岩浆活动紧密相关。金矿矿体产状有三种类型:岩浆穹窿构造型、隐爆角砾岩型和环状放射状断裂型。矿石类型主要有含金黄铁矿化石英脉、含金石英黄铁矿脉、含金多金属硫化物石英脉、含金黄铁矿化方解石脉等。金矿成矿年龄为119.40 -122.53 Ma。金矿体受统一的构造-岩浆流体蚀变系统控制,成矿物质来源于深部,成矿流体为岩浆水,晚阶段有少量大气水加入。成矿环境为中高温、中等压力,流体盐度为中等偏高,流体性质为弱碱性、弱还原性,属于K+-Na+- Ca2+-Cl--SO42-型流体。金在成矿流体中以[Au(HS)2]-、[AuCl2]-、[Au(CO3)]-及[Au(HCO3)2]-等络合物形式存在,当温度、压力下降时,溶液由酸性演化为弱酸性再到弱碱性时,络合物离解,金沉淀成矿。The superlarge Jinchang gold deposit is located in the connection between the Taipingling uplift and Laoheishan depression of the Xingkai massif in eastern Jilin and eastern Heilongjiang and the country rocks are metamorphic rocks of the Neoproterozoic Huangsong Group. In this region,the Yanshanian magmatism can be divided into 5 stages, the first three were mainly of diorite and granite and the latter two granitic porphyry and dioritic porphyrite, forming magmatic domes and cryptoexplosive breccia chimney, followed by large-scale hydrothermal alteration. Gold mineralization is closely related to the fourth and fifth phase of magmatism. Ores are mainly auriferous pyritized quartz vein, auriferous quartz-pyrite vein, auriferous metallic sulfide quartz vein, auriferous pyritized calcite vein. The age of the gold deposit is 119.40～122. 53 Ma. The ore bodies are controlled by an integral tectono--magmatic hydrothermal alteration system, the metallogenic source came from the deep, and the metallogenic fluid was magmatic water with subsequent input of some atmospheric water. The metallogenie conditions were medium-high temperature, medium pressure, salinity slightly higher than the medium level, and the fluid of weak alkaline and weak reducing, that are of the K^＋-Na^＋-Ca^2＋-Cl^--SO4^2- type. Gold was present in the fluid as complex compound, such as [Au（HS）2]^-, [AuCl2]^-, [Au（CO3）]^- and [Au （HCO3）2]^-. When the temperature and pressure lowered down and the fluid turned from acidic to weak acidic and further to weak alkaline, the complex compound cracked down and the gold precipitated.

关 键 词：岩浆穹窿构造 隐爆角砾岩 环状放射状断裂 金矿床 特大型 金厂 太平岭 黑龙江 成因研究 地质特征 

分 类 号：P618.51[天文地球—矿床学] TH133.3[天文地球—地质学]