蒙甘新相邻(北山)地区金铜矿床时空分布特征及成矿作用  

Temporal-Spatial Distribution and Metallogenic Processes of Gold and Copper Deposits in Inner Mongolia-Gansu-Xinjiang Border (Beishan) Region

作　　者：聂凤军[1] 江思宏[1] 白大明[1] 刘妍[1] 张义[1] 赵月明 安存杰 王新亮 苏新旭 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]内蒙古地质调查院,内蒙古呼和浩特010020

出　　处：《矿床地质》2003年第3期234-245,共12页Mineral Deposits

基　　金：国家自然科学基金 (编号 :40 0 73 0 15 );国土资源大调查项目 (编号 :K1.3 .3 2 )的联合资助

摘　　要：文章首次对蒙甘新相邻 (北山 )地区各类金、铜和铜_镍矿床 (点 )地质特征、成因类型和空间分布特点进行了系统总结 ,论证了金、铜和铜_镍成矿作用与古生代岩浆活动的关系 ,对区域地壳演化过程中金、铜和铜_镍成矿的动力学机制进行了深入讨论。研究结果表明 ,该区的金矿床 (点 )大体可划分为变质岩型、火山岩型、斑岩型和深成侵入岩型 ;铜矿床 (点 )有斑岩型、夕卡岩型和铜_镍硫化物型。金和铜矿床 (点 )大都沿古板块汇聚带分布 ,与海西期火成岩具密切的时空分布关系 。The Inner Mongolia-Gansu-Xinjiang border (Beishan) region, located at the convergence belt of the Siberia, Kazakhstan, Tarim and North China paleo-plates, is one of the most important metallogenic provinces in China. Deep-seated faults, Paleozoic igneous rocks, gold, copper and copper-nickel deposits (ore spots) are well developed in the region thanks to the multiphase Paleozoic orogenic events. The gold deposits (ore spots) can be classified into four types in term of their host rocks: (1) gold deposits hosted by Precambrian metamorphic rocks; (2) those occurring within volcanic or volcaniclastic rocks; (3) porphyry type ones and (4) those hosted by or related to granitoid plutons. In contrast to gold deposits (ore spots), three types of copper deposits (ore spots) are also identified: (1) porphyry type; (2) skarn type and (3) copper-nickel sulfide deposits (ore spots) hosted by or related to mafic-ultramafic intrusions. The relationship between the crust evolution and the gold, copper and copper-nickel metallogeny can be summarized as follows: (1) pre-orogenic stage: rift-faulting resulted in the formation of quartz vein type gold deposits within the Precambrian continent; (2) collision and orogenic stage: a number of porphyry gold and copper as well as skarn Cu deposits were formed; (3) post-orogenic stage: gold, copper and copper-nickel deposits were genetically related to the emplacement or eruption of mantel- or crust-derived magma. Systematic geological investigations into the gold, copper and copper-nickel resources of the region indicate that although the wall rocks of these deposits (ore spots) vary from place to place, most of them show an intimate relationship with the Hercynian tectonism and magmatism. Outstanding geological and geochemical features of these deposits have aroused interest among geologists both in China and abroad. An integrated analysis of the geological setting and geological as well as geochemical features of the gold, copper and copper-nickel deposits (ore spots) will greatly

关 键 词：地质学 金矿床 铜矿床 海西期岩浆活动 成矿作用 

分 类 号：P618.51[天文地球—矿床学] P618.41[天文地球—地质学]