吉林省汪清县金仓砂金矿地质特征及来源探讨

金仓砂金矿是吉林省延边地区著名的第四纪砂金矿床。其砂金含矿层中砾岩多呈棱角状,砂金粒度及形态沿河流流向分异现象不明显,砂金的连生矿物、伴生重砂矿物、成色、微量元素、稀土元素、铅及硫同位素、气液包裹体成分特征均可和矿区内原生金矿化对比。据此,初步从为金仓河砂金主要来源于金仓河谷中、上游底部基岩含金蚀变破碎带中的原生金。

THE GEOLOGICAL FEATURES AND A PRELIMINARY STUDY ON THE SOURCE OF GOLD OF THE JINCANG GOLD PLACER AT WANGQING COUNTY, JILIN PROVINCE

The Jincang gold placer is the well-known Quaternary gold placer in Yanbian area, Jilin province, In the ore-bearing strata of the placer gold, most of the gravels are angular. The differentiation in grain size and shape of the placer gold is not distinct along the flow direction of the river. The characteristics (such as intergrown minerals, associated placer minerals, percentage of gold, race elements, rare earth elements, lead and sulfur isotope,fluid inclusion,etc.)of the placer gold can be compared with the primary gold mineralization in the mine. Therefore, the placer gold is mainly derived from the primary gold of the gold-bearing alteration fracture zones of the bed rock of the middle and the upper courses of the Jincang river valley.