黑龙江省宝兴沟金矿成矿地质条件及成因探讨

GEOLOGY AND METALLOGENESIS OF THE BAOXINGGOU GOLD DEPOSIT IN HEILONGJIANG PROVINCE

宝兴沟金矿位于黑龙江省塔河县东北,区内主要发现两条金矿(化)体,分别为Ⅰ号和Ⅱ号金矿体.矿体产于中侏罗统二十二站组、额木尔河组陆相碎屑岩中及蚀变闪长岩、蚀变闪长玢岩脉(与砂岩接触带)中,矿石类型主要为蚀变砂岩型、构造破碎蚀变岩型.通过对宝兴沟金矿床野外地质条件的调查和对成矿地质条件的研究,认为燕山晚期的岩浆活动使围岩中的金元素活化、迁移,在陆相碎屑岩与脉岩接触带、构造破碎带富集,最终形成金矿床.燕山晚期的岩浆作用为金矿床的形成提供了一定的空间、热源及流体,同时也提供了一部分成矿物质.

The Baoxinggou gold deposit is located in the northeast of Tahe County, Heilongjiang Province. Two ore bodies are found in the continental clastic rocks and altered diorites and dikes of dioritic porphyrite of Jurassic Emurhe and Ershierzhan formations. The ores are mainly altered sandstone and fractured alteration rock types. Based on the field survey and research on the ore-forming conditions of Baoxinggou gold deposit, this paper concludes that the Late Yanshanian magmatism activated and emigrated the Au element in the wallrock. The gold deposit is formed in the contact zone between dikes and clastic rocks and in the fracture zone. The Late Yanshanian magmatism provided space, heat and fluid, as well as ore-forming matters for the gold deposit.