秦岭西成矿集区构造演化与铅锌成矿关系

通过对西成矿化集中区地质资料的综合分析,将矿集区铅锌成矿作用划分为加里东准备期、海西早期成矿期、海西晚期富集期和印支期改造叠加;不同阶段形成的矿床类型不同,矿床的形成、分布与构造具有一定的密切关系.晚古生代早期(D)的拉张断陷作用和中生代(T3)陆内造山作用对矿集区金属成矿产生了关键性的作用,前一事件形成了热水沉积盆地,进行了海底热水喷流沉积成矿作用;后一事件则在本区产生强烈广泛的构造岩浆活动,是本区的改造和再造铅锌矿床阶段.

The tectonic evolution of Xicheng concentrated mineralization area in Qinling Mountain with relation to lead-zinc deposits area

Based on the comprehensive analyses of the geology of Xicheng ore concentrated area in Qinling Mountain,this study classified the lead-zinc mineralization into Caledonian(before the main metallogenic period),Hercynian(earlier stage of the main metallogenic period),Indosinian(later stage of the main metallogenic period) and Yanshanian Epochs(after the main metallogenic period).The deposits formed at different stages have different ore types,and the formation and distribution of the deposits is closely related to structures.Late Early Paleozoic extensional depression and Middle Mesozoic intracontinental orogensis played a vital role in the metallic mineralization in the ore concentrated area.The former geologic process resulted in the formation of hydrothermal sedimentary basin and exhalative-sedimentary metallogenesis,while the latter resulted in the extensive regional tectonism and magmatism,both of which reformed the existed lead-zinc deposits.