黑龙江省塔河县十五里桥金矿床地质特征及控矿因素

摘 要]黑龙江省塔河县十五里桥金矿床位于上黑龙江前陆盆地南缘，是近年来新发现的具较大找矿潜力的金矿床，金矿化与石英脉关系密切，矿体受北东向断裂构造和角砾岩带控制，赋存于安山岩火山地层内，主要以脉状形式产出，具有浅成低温热液型矿床特征。矿区内安山岩、流纹岩属于过铝质钾玄岩石系列，流纹斑岩为过铝质高钾钙碱性岩石系列，二者为同源岩浆结晶分异的产物。矿床形成于早白垩世伸展环境，其成矿物质来源于以安山岩为主的火山岩地层，深部岩浆活动和区内脉岩是金矿化作用热源的主要提供者，而成矿流体则以大气降水为主；通过对矿区剥蚀程度的分析，初步认为矿床自东向西剥蚀程度逐渐减小，矿床西部深部找矿潜力大。

Geological Characteristics and Ore-controlling Factors of the Shiwuliqiao Gold Deposit in Tahe, Heilongjiang Province

Abstract: The Shiwuliqiao gold deposit of Tahe County, Heilongjiang Province, located in the southern edge of the Heilongjiang foreland basin, is a volcanic rock-type gold deposit with a great prospecting potential that was found recently. This deposit exhibits typical features of epithermal-type deposits, and the gold mineralization is closely related to the quartz veins and the ore bodies within the andesites, mainly appearing in veins and strictly controlled by the NE trending faults and the breccias zone. The andesite and the ryholite in the mining area belong to aluminum shoshonite series and the ryholite porphyry belongs to aluminum high-K calc-alkaline series, both of which were the crystallization products of homologous magma. This gold deposit formed in an early Cretaceous extensional environment, and the metallogenic materials mainly derived from andesite rocks, the primary source of gold mineralization was deep magmatic activity and dykes in the region, and the ore-forming fluid was mainly from atmosphere precipitation. Through analyzing the degree of denudation in the mining area, we infer that the degree of denudation decreases from the east to the west and the deep part in the west of the mining area has large prospecting potential.