Metallogenic Process in the Southern Margin of North China Paleocontinent
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摘要: 东秦岭大部分金属矿床集中分布于华北古大陆南部边缘,以陆缘构造发展阶段的赋矿沉积建造和岩石组合划分成矿系统:前长城纪陆核活动性边缘沉积成矿系统;中、新元古代被动大陆边缘成矿系统;早加里东期构造体制转换期成矿系统;中生代陆内碰撞造山成矿系统。按矿床形成作用方式可以划分为:①构造-岩浆-流体成矿作用,主要以洛南-栾川钼(钨)多金属斑岩组合成矿系统为主,成岩方式为壳幔同熔的燕山期中酸性岩浆的浅成侵入与定位;②构造-建造-流体成矿作用,按不同构造作用层次再细分为中深层次的构造作用(主要形成韧性剪切带型矿床)、浅层次构造作用(主要形成构造蚀变岩型矿床)。主要的成矿作用发生在燕山期。Abstract: According to tectonization characteristics of the study area in the southern margin of North China Paleocontinent, the metallogenic system could be classified into five subsystems:①the pre-Mesoproterozoic metallogenic subsystem in the active southern margin of North China Paleocontinent;② the Middle-Late Proterozoic metallogenic subsystem in the inactive continent margin;③ the Early Paleozoic metallogenic subsystem in the converse type continent margin; ④the Paleozoic metallogenic subsystem in the active margin;⑤the Mesozoic metallogenic subsystem in the collision margin. The metallogenic processes are mainly present as follows:①structure-magma-fluid metallogenic process, which is related to magmatic activities of Yanshanian intermediate-acid small rock masses;②structure-formation-fluid metallogenic process, which can be divided into two types according to the structural process levels,the ductile and ductile-brittle shear zone type ore deposit formed by the middle-deep level structural process and the structure-altered rock type ore deposit formed by shallow level structural process. The metallogenic belt is controlled by a EW-plunging mantle syncline. From east to west there are check-form fractures, which control synergic crust-mantle grano-porphyry rocks.
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