甘肃寨上金矿床地质特征与成因分析

The Geological Characteristics of Zhaishang Gold Deposit of Gansu Province

通过对寨上金矿床的成矿地质特征、同位素、包裹体的分析，划分出了该金矿的4个成矿阶段，并得出了成矿流体属于中一低温、低盐度、低密度流体，压力集中在40～70MPa，成矿平均深度为5．73km。硫同位素特征表明金矿硫源为岩浆硫和地层硫的混合硫，二者在成矿作用中发生了交换作用。在构造热效应和地热梯度的驱动下，流体活化迁移至地壳浅部形成微细浸染型金矿床。

By the analysis of metallogenic geological characteristics, isotope and inclusion of Zhaishang gold deposit, four metallogenie stages of this deposit are marked off, and ore--forming fluid remains middle-- low temperature, low salinity and density fluid which keeps the stress between 40 and 70 Mpa and average ore--forming depth of 5.73 kin. The characteristics of sulfur isotope show that sulfur of gold deposit come from mixture of magmatic sulfur and stratum sulfur which both exchange each other in the metallogenic stages. With the drive of structural thermal effects and geothermic grads, fluids is and move to shallow crust, which lead to forming of micro--disseminated gold deposit.