黑龙江呼玛旁开门金银矿矿带地质特征与找矿标志

旁开门金银矿床位于黑龙江省呼玛县境内，目前已发现 5 个矿带 11 个矿体。其中Ⅱ、Ⅲ、Ⅴ 矿带 5 个矿体已完成了详查工作，矿体呈不规则脉状，沿走向和倾向有膨胀和收缩现象，受一组北北西向张性断裂控制。矿体主要赋存于下白垩统龙江组安山岩破碎带中，空间分布与硅化角砾岩一致，载矿岩石主要为硅化角砾岩。金平均品位 2. 77 × 10 －6，银平均品位 60. 58 × 10 －6，探求 332 + 333 金、银资源量分别为 8. 70 t、138. 31 t，为一中型金银矿。通过对旁开门金银矿的地质特征分析，认为该矿体受下白垩统龙江组、光华组及北北西向断裂控制，属中低温火山热液型矿床。围岩蚀变 ( 硅化、绢云母化、破碎化、黄铁矿化) 及物化探异常等找矿标志对省内寻找同类矿床具重要意义。

Geological characteristics and prospecting guide of Pangkaimen gold and silver belt in Huma of Heilongjiang

Pangkaime found 5 mine zones and 11 n gold and silver deposit is located in Huma County of Heilongjiang, where have been mine bodies, in which and five mine bodies from the mine zones of II , HI, V were investigated. The mine bodies expanded and contracted along the direction and tendency with irregular shape, and controlled by a group of NNW trending extensional fracture. The mine bodies mainly occurred in the Lower Cretaceous Longjiang Formation andesite fracture zone, their spatial distribution were consistented with the silicified breccia, which were the mainly mine rocks. The average gold grade of 2. 77 x 10-6, silver average grade of 60. 58 x 10-6, the 332 ＋333 gold and silver resources are 8.70 t and 138.31 t, respectively, which shows a medium- sized gold and silver mine. Through the geological characteristic analysis, the authors proposed that the gold and silver mine bodies controlled by the Lower Cretaceous Longjiang and Guanghua formations and NNW trending frac- ture, belonging to volcano mesothermal deposits. The wall rock alterations （silicification, sericitization, fragmenta- tion, and pyritization） and geophysical-geochemical anomaly prospecting guide were important for searching of the similar deposits in Heilongjiang Province.