闽北地区变质作用基本特征和成矿元素迁移富集规律

Basic Features of Metamorphism and the Migration and Enrichment Law of Ore-forming Elements in Northern Fujian

闽北地区面型带状分布的巴罗式前进变质带从浅→深→混合岩化带→区域型混合花岗岩呈渐进过渡式的、是和谐的。断裂变质作用缺乏从深→浅的面型带状分布的进变质带,变质级与混合岩化强度带不和谐,呈突变跳跃式。研究表明,成矿元素在区域变质作用过程中难以大规模迁移与富集,混合岩化花岗岩化作用提供了成矿元素迁移富集的物理化学条件;区域型混合花岗岩和边缘型混合花岗岩与岩浆花岗岩(狭义的)在成矿作用方面有明显的差异,表现出别具一格的成矿专属性。

The Barrao progressive metamorphism belts distributed as a plane and zonal form in Northern Fujian make a progressive transition from the hypabyssal migmatization to the plutonic migmatization to the regional migmatitic granite. The faulting metamorphism comes short of the constructive metamorphism belt as the deep to shallow surface types of zonal arrangement. The gradation of metamorphism and the intensity of migmatization act like a iumping. The research results are shown that the ore-forming elements are difficult to mass migration and enrichment during the regional metamorphism, but the migmatization and granitization offer to the emigration and enrichment physicochemical conditions of ore- forming elements. The regional migmatitic granite, marginal migmatitic granite and magmagranite have an obvious difference in the ore-forming process, which is indicative of a unique metallogenic specificity.