黑龙江金厂金矿床矿化类型及包裹体特征研究

Study on the main mineralization type and the inclusion features of the Jinchang gold deposit, Heilongjiang

东宁金厂金矿床是与印支—燕山期中酸性火山 次火山岩有关的大型金矿床,矿化类型主要有角砾岩型、黄铁矿 多金属硫化物细脉充填型及破碎蚀变岩型。金矿成矿主要与次火山岩相的闪长玢岩有关,该成矿期可分4个成矿阶段。金矿成矿主要为中高温、中等压力环境,成矿流体为具有中等偏高的盐度、弱碱性、弱还原的K+ Na+ Ca2+ Cl- SO2-4型流体。在高温、高压及酸性的条件下,Au主要以[Au(HS)2]-、[AuCl2]-、[Au(CO3)]-及[Au(HCO3)2]-等配合物的形式向上运移,当温度、压力下降,溶液由酸性演化为弱酸性再到弱碱性时均有利于配合物的离解而使金沉淀成矿。

The Jinchang gold deposit of Dongning is a largescale deposit that related to the intermediateacid volcanicsubvolcanic of IndosinianYanshanian. Cryptoexplosion breecia type, polymetallic sulfide veinlet fillling type and fractured alteration rock type are the main mineralization types. The mineralization of gold has close relationship with the dioriteporphyrite of subvolcanic face, and the metallogenic epoch can be divided into 4 stages. Gold mineralized condition is mediumhigh temperature and medium pressure, the mineralizaing fluid is the K+Na+Ca2+Cl-SO2-4 type liquid which in mediumhigh salinity, weak acidity and weak reduction. Gold is moved in form of -, -,- and - in hightemperrature, highpressure and acidity orefluid. The drops of temperature and pressure, transformations of fluid from acidity to weak acidity till weak alkalinity are helpful to dissociation of the complex and gold deposition.