华北古大陆西南边缘构造格架与成矿系统  

GEOTECTONIC FRAMEWORK AND METALLOGENIC SYSTEM IN THE SOUTHWEST MARGIN OF NORTH CHINA PALEOCONTINENT

作　　者：汤中立 白云来 

机构地区：[1]甘肃地质勘探局

出　　处：《地学前缘》1999年第2期271-283,共13页Earth Science Frontiers

基　　金：地质矿产部重点基础项目

摘　　要：根据本区地层、构造、岩浆作用特点，在“系统论”、“活动论”思想指导下，厘定华北古大陆西南边缘的构造格局如下：龙首山陆缘带、河西走廊弧后盆地、北祁连缝合带、中祁连离散型岛弧地体、南祁连弧后盆地、柴达木地块。根据构造发展阶段和成矿作用特点，确定本区成矿系统及组合如下：（１）华北板块西南边缘太古宙—中元古代裂解期前成矿系统：东大山铁成矿组合，金川镍铜成矿组合；（２）柴达木板块北缘中、新元古代裂解成矿系统：桦树沟—柳沟峡铁成矿组合；（３）加里东期活动大陆边缘成矿系统：早期岛弧裂谷成矿组合（白银厂—清水沟铜及多金属成矿组合），中、晚期岛弧成矿组合（红沟—蛟龙掌铜及多金属成矿组合），弧后扩张盆地成矿组合（猪咀哑巴—九个泉—石居里铜及多金属成矿组合），与俯冲作用有关的岩浆热液成矿组合（塔尔沟—小柳沟钨成矿组合，桦树沟—柳沟峡铜成矿组合，大东沟—吊大坂铅锌成矿组合），洋壳残片成矿组合（大道尔吉铬成矿组合，玉石沟铬成矿组合）；（４）碰撞造山成矿系统：前陆盆地成矿组合（天鹿铜成矿组合），陆内造山韧性剪切成矿组合（寒山—鹰咀山金成矿组合）。According to the characteristics of strata,tectonization and magmatism within the research area in the southwest margin of North China paleocontinent, and under the ideological guidance of mobilism and systematology, the geotectonic framework of the area could be divided as follows: (1) The Longshoushan mountains continental margin; (2) The Hexi Corridor back arc basin; (3) The Northern Qilianshan mountains suture zone; (4) The Central Qilianshan mountains dispersion type island arc terrane; (5) The Southern Qilianshan mountains back arc basin; (6) The Qaidam massif. In the light of tectonic evolution stage and metallogenesis, these metallogenic system (assemblage) could be classified as follows: (1) The pre divergent metallogenic system in the southwest margin of North China Paleocontinent in the Archean Meso Proterozoic:Dongdashan iron,Jinchuan Nickel copper. (2) The divergent metallogenic system in the northern margin of the Qaidam paleoplate in the Middle Late Proterozoic:Huashugou Liugouxia iron.(3) The metallogenic system in the active margin in the early Paleozoic:the metallogenic assemblage in the island arc rift in the early stage(Baiyinchang Qingshuigou copper polymetallic);the metallogenic assemblage in island arc in the Middle Late stage (Honggou Jiaolongzhang copper polymetallic);the back arc extensional basin (Zhuzhuiyaba Jiugequan Shijuli copper);the metallogenic assemblage in connection with subduction and magmatic hydatogenesis (Taergou XiaoLiugou wolfram; Huashugou liugouxia copper;Dadonggou Diaodaban lead zinc);The metallogenic assemblage is related to the oceanic crustal shards (Dadaoerji chromite;Yushigou chromite). (4) The metallogenic system has something to do with collision type orogeny:the metallogenic assemblage in foreland basin(Tianlu copper);the metallogenic assemblage with the intracontinental orogeny and ductile shear(Hanshan Yingzhuishan gold).

关 键 词：古大陆边缘 构造格架 成矿系统 成矿组合 金矿床 

分 类 号：P612[天文地球—矿床学] P618.510.5[天文地球—地质学]