华北地台北缘绿岩带与金矿演化系列

The Greenstone Belt and the Evolution Series of Gold Deposits at the Northern Margin of the North China Platform

华北地台北缘早前寒武纪变质杂岩中绿岩带分布广泛.与国外典型绿岩带对比,具有超镁铁质岩石不发育、变质深、构造变形强烈、个体面积小等特点.这是由于华北地台活动性较大之故.绿岩带中金矿分布甚广,按成因类型可分为沉积变质型、变质热液型、混合岩化热液型、岩浆热液型和叠生型等.构成以绿岩建造为原始矿源层的多时代、多种成矿作用、多种成因类型相伴产出的成矿演化系列.

The Precambrian greenstone belts are widespread in the northern margin of the North China Platform, and characterized by:no ultramnfic rocks developed; absence of turbidite and molasse; stronglymetamorphosed, tectonically deformed, small in area the ore bodies; and so on, for reason of thelarge activity of the North China Platform. In the greenstone belt gold ores have a wide distribution.According to the genetic classification of ore deposits in our country one can distinguish: sedimentometamorphic; metamorphogenic hydrothermal, migmatized hydrothermal; magma hydrothermal and telescoped. The mineralization evolution series consists of multiphasic, multiple genetic, multiplemineralization type ore deposits associated with each other, with greenstone formation as their primary-sonrce bed.