摘要
对黑龙江省８２件砂金样品及与之对比的１６件岩金样品进行铅同位素测定，结果表明它们与Ｃ１及Ｃ２省中生代岩浆岩的长石铅平均值十分接近。大部分铅来自造山带，少量源自地壳，表明砂金矿多来源于与中生代岩浆活动有关的金矿床。铅同位素的三维拓扑图解亦可用于估计原生岩金矿的剥蚀程度及示踪砂金的原生源。
Pbisotope compositions of 82 placer gold samples and 16 comparesive rock gold samples in Heilongjiang province are similar to the average Pb isotopic composition of feldspar from Mesozoic magmatic rocks in C_1 and C_2 provinces. Most of the Pb derived from orogenic belt and a little from crust, indicating that placer gold mainly came from gold deposits related to Mesozoic magmatic activities. The 3 dimensional topo diagram of Pb isotopic composition can also be used to estimate the denude degree of the primary rock gold deposits and trace the primary source of the placer gold.
出处
《黄金地质》
1998年第1期1-8,共8页
Gold Geology
关键词
砂金矿床
铅同位素
原生金源
地质特征
金矿床
placer gold, Pb-isotope, Pb-isotope of feldspar, primary source of gold, Heilongjiang
