黑龙江省三合屯金矿床地质特征及找矿潜力分析

三合屯金矿是黑龙江省嫩江市新发现的一处小型金矿床，大地构造位置处于兴蒙造山带东段兴安地块与松嫩地块交会部位，多宝山岛弧带和嫩江—黑河构造混杂岩带、新开岭微地块、塔溪火山弧的会聚部位。近年来，通过开展国土资源大调查和矿产勘查工作，在矿区内圈定了多条金矿体，但缺乏对矿床成因和矿石类型的系统研究。因此，本研究重点对矿区矿体和矿石特征、区域构造控矿特征及典型金矿床成矿特征进行综合分析。研究表明：三合屯金矿产于白垩系火山岩、碎屑沉积岩与早石炭世糜棱岩化花岗岩的接触部位，矿石类型为构造蚀变岩；矿体总体走向NE，倾向NW，倾角较缓；围岩蚀变主要为硅化和绢云母化，矿石矿物主要为黄铁矿，还有少量闪锌矿和黄铜矿，还含有少量金矿物和碲化物。目前该矿床在延长和延深方向均未得到完全控制，具有较大的成矿潜力，嫩江—黑河构造混杂岩带是黑龙江省下一步开展金矿找矿突破的重要部位。

Geological Characteristics and Prospecting Potential of Sanhetun Gold Deposit in Heilongjiang Province

Sanhetun gold deposit is a newly discovered small-sized deposit in Nenjiang City，Heilongjiang Province，which is located in the eastern part of Xing-Meng orogenic belt，at the intersections of Xing’an and Songnen blocks，and the convergence sites of Duobaoshan island arc belt，Nenjiang-Heihe tectonic mélange belt，Xinkailing micro-block and Taxi volcanic arc.In recent years，a lot of gold orebodies have been delineated in the mining area through the large-scale investigation of land and resources and mineral exploration，however，the genesis of ore deposits and ore types are lack of systematic research.Therefore，the comprehensive analysis are focused on the characteristics of orebodies and ores in the mining area，the ore-controlling characteristics of regional structures and the metallogenic characteristics of typical gold deposit.The results show that Sanhetun gold deposit occurs in the overlapping area between Cretaceous volcanic rocks，clastic sedimentary rocks and Early Carboniferous mylonitic granites，and the ore type is tectonic altered rock.The orebody overall strikes NE，inclines NW with slow dip angle.The wall rock alteration is mainly silicification and sericitization.The ore minerals are composed of pyrite，sphalerite，chalcopyrite with minor native gold and telluride.At present，the gold deposit are not completely controlled in the extension and depth direction，and there is still great metallogenic potential.The Nenjiang-Heihe tectonic melange belt is an important part of the next breakthrough of gold prospecting in Heilongjiang Province.