小秦岭地区金矿成矿机理分析

小秦岭成矿带是我国重要的贵金属成矿带之一，区域成矿地质背景和成矿条件显示了该区良好的资源潜力。金矿受地层、构造和岩浆岩控制，具有“三位一体”的成矿模式。成矿过程复杂，太古宙太华群为成矿提供了物质基础，区域变质作用使金发生初次富集；早期自北而南的挤压形成规模巨大的推覆构造为含金石英脉的生成提供了有利空间；燕山期构造-岩浆活动对金的活化、迁移、富集起主导作用。金成矿温度属中低温热液矿床，围岩蚀变简单，成矿具有多阶段、多成因等复合型特征。矿床成因为动热再造多元热液型。通过对该区综合研究工作的不断深入，初步显示开展小秦岭地区深部找矿工作具有重要的现实意义。

Metallogenic Mechanism Analysis of Gold Deposits in the Xiaoqingling Region

The Xiaoqinling metallogenic belt is one of precious metals resource bases in China. Based on its regional geological setting and ore-forming conditions, the belt has great potential in gold mining. The gold ore deposit in the belt is controlled by strata, structure and magmatic rocks. The metallogenic progresses are complicated. The metallogenic substances are derived from the Archaean Taihua group, and regional metamorphism initially enriched gold, large scale thrust nappes were formed by compression from north to south, which generated favorable structures for gold-bearing quartz veins to be emplaced. The tectono- magmatic activities during the Yanshan orogeny are critical for activation, migration and enrichment of gold. The ore-forming temperature is at middle-low degree. The country rock alteration is rather simple. The gold mineralization is characterized by multi-source, multi-stage and multi-genesis. The genesis type is hydrothermal deposit plus tectonic modification by deformation and metamorphism. Accompanied by advanced synthetic study in the Xiaoqinling region, it is shown that prospecting at depth will be significant in the Xiaoqingling region.