黑龙江六九山铜银矿床地质特征

黑龙江六九山铜银矿床位于大兴安岭成矿带中东部，是近年发现的浅成低温热液型矿床.矿床产于爆破角砾岩带中，矿带东西长约1200 m，南北宽约500 m.矿带分布范围与角砾岩带基本一致，产于晚侏罗世花岗闪长岩和白音高老组火山岩中.共圈定24条矿体，其中工业矿体19条.矿体呈不规则脉状、透镜状，总体走向61°，倾向北西，倾角20~35°.矿体长度不大于780 m，一般在300 m左右，平均厚度7.18 m.矿体平均品位Cu 0.59%~1.01%，伴生Ag 3×10^-6~5×10^-6.矿床平均品位Cu 0.73%，伴生Ag 5.87×10^-6.六九山地区火山-岩浆活动强烈，在方圆20余平方千米内发育有9座中心式火山.六九山铜银矿床与中生代火山-岩浆活动关系密切，其形成大致可分为3个阶段：早二叠世成矿物质准备阶段，晚侏罗世成矿物质初步富集阶段和早白垩世成矿阶段.

GEOLOGICAL CHARACTERISTICS OF THE LIUJIUSHAN COPPER-SILVER DEPOSIT IN HEILONGJIANG PROVINCE

The Liujiushan Cu-Ag deposit in Heilongjiang Province, located in the middle-eastern Daxinganling metallogenic belt, is an epithermal vein deposit. The deposit is distributed within explosive breccia zone, with a width of 500 m and a length of 1200 m. The ore belt occurs in the Late Jurassic granodiorite and the volcanic rocks of Baiyingaolao formation, which consist with the breccia zone. Totally 24 ore bodies are identified in the deposit, of which 19 are commercially significant. The ore bodies are in irregular veins and lens, with a strike of 61° and dip angle of 20°-35°. The lengths of single orebodies are not longer than 780 m, usually around 300 m, with an average thickness of 7.18 m. The Cu grade of ore bodies ranges from 0.59% to 1.01%, with associated Ag of 3×10^-6 to 5×10^-6. The average Cu grade in the deposit is 0.73%, with Ag of 5.87×10^-6. Intense volcanic-magmatic intrusions took place in the Liujiushan area, with 9 central type volcanoes distributed in the 20 km² area. The Liujiushan Cu-Ag deposit is closely related to the Mesozoic volcanic-magmatic activities. The formation of the deposit experienced three stages, i.e. 1) ore-forming material deposition in Early Permian; 2) mineral preliminary enrichment in Late Jurassic and 3)mineralization in Early Cretaceous.