秦岭造山带重大地质事件、矿床类型和成矿大陆动力学背景  

Main Geological Events,Genetic Types of Metallic Deposits and Their Geodynamical Setting in the Qinling Orogenic Belt

作　　者：朱赖民[1] 张国伟[1] 李犇[1] 郭波[1] 

机构地区：[1]西北大学地质系,大陆动力学国家重点实验室,西安710069

出　　处：《矿物岩石地球化学通报》2008年第4期384-390,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重大基础研究项目(2006CB403502);中国科学院矿床地球化学国家重点实验室项目(20060);国家自然科学基金项目(40872071);陕西省教育厅基金项目(07JK414);南京大学成矿作用国家重点实验室项目(14-08-1)资助

摘　　要：秦岭造山带由两条主缝合带(商丹、勉略缝合带)及其分划的三个地块(华北地块南缘、秦岭微地块和扬子地块北缘)组成。秦岭造山带是在晚太古-中元古代洋陆间杂构造基础上,于晚元古代-中三叠世经历现代板块构造体制的主造山期的华北、秦岭、扬子三板块依次沿商丹和勉略两条缝合带由南向北俯冲碰撞造山,奠定了基本构造格局,并由于后造山期强烈的陆内造山作用的叠加改造成复合型造山带。秦岭造山带内的金属矿床主要有热水喷流沉积型铅-锌矿床、火山喷流型块状硫化物、斑岩-矽卡岩型钼(钨)矿床、卡林-类卡林型金矿床、岩浆热液脉型金矿床和低温热液改造型汞锑矿床。造山带内的商丹和勉略缝合带产有部分岩浆分结或熔离型铬铁矿和铜镍硫化物矿床。沉积-变质成因铁矿床主要分布在扬子和华北古板块边缘。秦岭造山带造山过程与成矿作用演化存在时空耦合关系,因此研究秦岭造山带成矿事件对其不同时期地质事件的响应,对发展我国大陆成矿理论具有重要理论和实际意义。The Qinling orogen was built up through interplay of three blocks, the North China block, the small Qinling block , and the South China block, separated by the Shangdan and Mianlue sutures. The Qinling orogen as a complex orogen experienced a prolonged continental divergence and convergence between the blocks. The first stage is the formation of the orogenic basements in Precambrian. The second stage is the plate tectonic evolution in Late Proterozoic-Middle Triassic, which is the main orogenic stage and characterized by plate tectonic regime. The last is the Mesozoic-Cenozoic intercontinental tectonic evolutionary stage. There are SEDEX and VMS type sulfide deposits, the Porphyry-Skarn type Mo（W） deposits, the Carlin- Carlin like gold deposits, the magmatie hydrothermal vein type gold deposits, and the epithermal Hg-Sb deposits etc. The magmatic fractionation-crystallization, and sulfurization segregation type deposits, such as chromite and nickel deposits, distribute in Shangdan and Mianlue sutures. The sedimentary metamorphic type Fe deposits locate in the rim of Yantze and North China block. There is time and space coupling relation between the formation of Qinling orogenand the Mineralization Evolvement of ore deposits, so the study of responding of ore deposits to Geological Events have important theory and practice has both theoretical and practical significance.

关 键 词：秦岭造山带 成矿作用 成矿动力学背景 

分 类 号：P612[天文地球—矿床学]