华北古大陆南缘的金属成矿作用  

Metallogenic Process in the Southern Margin of North China Paleocontinent

作　　者：张正伟[1] 翟裕生[2] 邓军[2] 朱炳泉[1] 林潜龙 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国地质大学 [3]河南省地质科学研究所

出　　处：《地球学报》2001年第2期129-134,共6页Acta Geoscientica Sinica

基　　金：国家自然科学基金! (编号 40 0 72 0 33);国家攀登计划! (编号 95预 2 5 );国土资源部项目! (编号 95 0 110 7)联合资助

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。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.

关 键 词：金属矿床 成矿作用 古大陆边缘 地球化学急变带 赋矿沉积建造 构造作用 成岩方式 

分 类 号：P618.2[天文地球—矿床学]