阿尔泰地区华力西期火山作用与金矿的关系

阿尔泰地区华力西期火山作用强烈,火山岩分布广泛.根据火山活动方式、火山岩的空间分布及岩石组合,火山作用的构造背景,将本区划分为5个构造-岩浆岩带.在分析全区火山岩的岩石学、岩石化学、地球化学和稀土元素等特征的基础上,进而讨论了火山作用的构造地质背景,指出了华力西期阿尔泰地区为板块碰撞机制下的沟、弧、盆体系.火山作用与金成矿作用关系的研究表明:形成金矿化的诸多因素,包括矿质来源、动力源、矿液通道、容矿围岩等都与火山作用有关;金矿成矿带的空间展布受构造-岩浆岩带的控制.

VARISCAN VOLCANISM AND RELATED GOLD ORE-FORMING PROCESS IN ALTAY, XINJIANG

Variscan volcanism was violent. There are wide-spread volcanic rocks in Altay.area. According to volcanic activity styles, spatial distribution of volcanic rocks, rock associations and tectonic setting of volcanism, this area is divided into five tectonic-magmatic zones. After making systematical study of petrology, petrochemical and REE characteristics of the volcanic rocsk, and discussing the tectonic geological setting of volcanism, authors consider that there was a system of trench, island arc, and back arc basin in Variscanian. Studie's on the relation of volcanism and gold ore-forming process indicate that many factors to form gold mineralization, including source of ore-forming materials, force to drive out fluid, ore-forming fluid conduit, ore-bearing wall rocks, were related to volcanism. Spatial distribution of gold mineralization zones were confined to tectonic-magmatic zones.