小秦岭成矿带金矿化垂向分带规律及其地质意义

本文分析了小秦岭成矿带金矿化不同矿化类型、石英脉型金矿化不同矿化阶段及不同金矿床类型在垂向上的变化特征,确立了金矿化在垂向上的分带规律。在此基础上,探讨了深部"第二矿化段"存在的可能性,推断了金矿化的剥蚀深度及矿脉在深部的矿化特点,为金矿床的深部预测提供了可靠的依据。

THE MINERALIZATION VERTICAL ZONING OF GOLD DEPOSIT AND ITS GEOLOGICAL MEANING IN XIAOQINLING GOLD MINERAL BELT

The paper studys the vertical zoning characteristics of different mineralization types and different stages as well as deposit types of quartz veins, building up the zone law. ①Along the extension of ore body, from depth to superficial, altered rock mineralization type changes into quartz type, and between them there is a transitional area. ②The different dispersed scope of stages of quartz vein form the vertical zone law of mineralization stages of quartz vein: I stage dispersed in the depth, while Ⅱ、Ⅲ stage dispersed in the superfical. ③The zonelaw of deposit types is controled by different stages of quartz vein. Wenyu type pb-Au deposit and Qinshan type gold deposit dispersed in the superfical, Yangzhaiyu and Linghu type gold deposit dispensed in the depths.Based on the studying of vertical zone law, the paper explores the possibility that it exists" the second mineralization part" in the depths, infers the corrode depths of gold deposits in Xiaoqinling: ①it is impossible to exist the second mineralization such as quartz vein type in the depths in Xiaoqinling, but there is altered rock type gold deposit in the depths; ②the corrode depth of gold deposits is between 4. 0 to 4. 8km and it is different in different mining areas;③based on the vertical zone law, we can guess the deep mineral characteristics of gold veins and supply the basis for the prospection in the depths.