黑龙江省漠河县金沟林场地区砂金特征及其与岩金的关系

Characteristics of gold placers in Jingoulinchang district,Mohe,Heilongjiang Province,and its connection with rock gold deposits

漠河县金沟林场地区砂金丰富,采集砂金样品3件,对砂金的粒度、形态、成分等进行了统计分析和测试。结果表明,区内砂金粒度为中粗粒,形态总体上以粒状为主,板状、片状次之;分选性一般,磨圆度中等;砂金溶蚀系数小,成色高,结合微量元素含量等特征可以判断砂金的主要补给源表现为中近源或近源,与岩金矿关系密切并具有一定的继承性,来源于八里房、砂宝斯林场或其它岩金矿床;区内剥蚀程度小,研究区东部岩金找矿潜力大。综合研究表明,砂金的原生金矿床类型为中低温热液型矿床。

With rich gold placers in Jingoulinchang district, Mohe County, statistic alanalysis and test on granularity, shape and component of three gold placer samples are carried out. The result indicates gold placers are mediumcoarse particle size, forms of which arein general granular, followed by plate and sheet, and with ordinary selectivity and moderate roundness. The corrosion coefficient is low and purity is high. Considering the characteristics such as the content of trace elements, it suggests that the gold placers are proximal or medium-proximal to sources, and are inti- mate with gold deposits, in succession to gold deposits like Balifang, Shabaosilinchang and others. With little degree ofdenudation, the east part of the target area displays large great prospecting potentials for gold deposits. Through comprehensive analysis, the paperinfers that gold placers originate from middle-low temperature hydrothermal deposits.