冀东地区东梁金矿床地质特征及成因

Geological characteristics and genesis of Dongliang gold deposit in eastern Hebei province

东梁矿区位于冀东地区宽城凹褶束东南边缘。金矿床主要产于燕山期火成岩与中元古界长城系、蓟县系碳酸盐岩地层的接触带部位,受构造、岩浆活动控制。矿区岩（矿）石地球化学分析结果表明,成矿流体中的硫、铅主要来源于深部,与深部岩浆活动有关;氢、氧同位素分析结果显示,成矿流体主要来源于原生岩浆水;金矿床成矿温度125~305℃,成矿深度1.5km,成矿时代为燕山期火山活动晚期。认为在燕山期板块构造影响下,东梁金矿床成矿物质主要来源于深部活化变质岩系,属岩浆热液型中低温金矿床。

Dongliang gold deposit is located in the southeast edge of the Kuancheng arcuate fold area.It occurs mainly at the contact zone of Yanshanian acid igneous rocks and carbonate rocks of Middle Proterozoic Changcheng system and Jixian system and is controlled by structure and magmatism.Analysis of geochemical characteristics of the rock and ore samples show that S and Pb in ore fluid is derived from deep part and is related to the deep magmatism and H and O from the primary magmatic water.It is formed at later magmatism during Yanshanian period at temperature125~305℃and depth 1.5km.Under influence of Yanshanian plate tectonic movement ore materials of the deposit are mainly derived from the activated metamorphic rock series at depth and it belongs to meso-epithermal magmatic fluid type Au deposit.