黑龙江省嫩江—黑河构造混杂岩区永新金矿热液蚀变与矿化关系定量及定位研究

Quantitative and Positioning Study on the Hydrothermal Alteration and Mineralization Relationship of the Yongxin Gold Deposit in the Nenjiang-Heihe Mélange Zone,Heilongjiang Province

黑龙江省嫩江县永新金矿是近几年在嫩江—黑河构造混杂岩地区新发现的大型断裂带蚀变岩型金矿床,矿石矿物主要为碲金矿、碲金银矿、自然金,有少量的硫化物及氧化物。通过钾长石化带、绢云母化带及硅化带厚度与矿体厚度的线性关系分析得出,本区钾长石化带厚度、硅化带厚度与矿体厚度呈正相关关系,绢云母化带厚度与矿体厚度呈负相关关系。蚀变带厚度及矿体厚度水平面投影结果表明,矿区内热液蚀变在水平方向上具有明显的分带现象,自矿区东南到西北呈"阶梯状"分布,且绢云母化带厚度高值区、钾长石化带厚度高值区及硅化带厚度高值区在各阶梯中具有一定的对应关系。据以上分析,永新金矿成矿流体来自北西方向,矿体总体向北西延伸,暗示矿区西北深部具有较好的找矿前景。

The Yongxin gold deposit,which was recently discovered in the Nenjiang-Heihe mélange zone,Heilongjiang Province,is a large fracture controlled alteration type gold deposit in Duobaoshan gold-copper metallogenic belt. The ore minerals are composed mainly of petzite,calaverite,native gold,minor sulfides and minor oxide. According to the linear analyses between the thickness of potassium feldspathization zone,sericitization zone,silicification zone and ore-bodies,the thicknesses of the potassium feldspathization zone and silicification zone are positively correlated with ore body thickness. The thickness relation between sericitization zone and ore body are negative. According to the quantitative assessment and the chart of the horizontal projection of the alteration zones,sericitization,potassium feldspathization and silicification zones occurred respectively in the direction from SE to NW,like a ＂step＂. The thicknesses of the potassium feldspathization zone,sericitization zone and silicification zone have a certain corresponding relationship in each ＂step＂. The source of the oreforming fluid of the deposit is inferred by the authors at the northwest depth,and good prospecting potential inthat direction is suggested.