南秦岭镇旬盆地微细浸染型金矿矿化特征与成矿动力学机制  

Mineralization characteristics of submicro disseminated type gold deposits and dynamic metallogenic mechanism in Zhen'an-Xunyang basin,southern Qinling mountain blet

作　　者：唐永忠 朱增伍 吴昊 祝国柱 魏东[2] 姚珊[1,3] 

机构地区：[1]陕西省地质调查中心,西安710068 [2]中国地质大学(北京),北京100083 [3]中国地质大学(武汉),武汉430074

出　　处：《矿产勘查》2016年第2期307-315,共9页Mineral Exploration

基　　金：中国地质调查局矿产资源评价项目(编号:200110200029;1212011085109)资助

摘　　要：南秦岭镇安—旬阳地区早古生代为一裂陷沉积盆地,发育一套碳酸盐岩与细碎屑岩沉积建造,形成规模巨大独具特色的以金、汞锑矿为主的多金属成矿带。其金矿主要受地层岩性、构造、沉积相与热水活动多因素控制,具有微细浸染型金矿典型的Au-As-Hg-Sb-W地球化学元素组合,主要载金矿物为含砷黄铁矿、毒砂,具低温矿物组合。印支运动是区内早中生代的一次非常重要的区域性构造运动,使扬子、华北板块与秦岭微板块完成最终的拼合,秦岭地壳大幅度缩短,南秦岭呈多层次的逆冲推覆,最终形成一系列由北向南逆冲的叠瓦式薄皮构造。区域构造应力以南北方向为主,南秦岭经历了4期构造变形,形成了不同的构造形态,岩浆活动也非常强烈。在印支期主构造成矿期之后,受燕山期成矿作用的影响,并叠加于印支期成矿之上,形成了区内众多的以金为主的多金属造山型矿床。The Zhen＇ an-Xunyang basin located in southern Qinling mountain belt is a Early. Paleozoic sedimentary basin. The sedimentary for.mation consists of a suit of carbonate and elastic rocks and a large-scaled Au-Hg-Sb polymetallic metallogenie belt was formed in the basin. The gold mineralization is jointly controlled by stratigraphic lithology, structure, sedimentary facies and hydrother- mal activity with typical geochemical element combination of Au-As-Hg-Sb-W which occurs in submiero disseminated type gold de- posit. The main gold-bearing minerals are arsenic pyrite, arsenopyrite and low-temperature minerals. Indo-China movement is a very important early Mesozoic regional tectonic movement in the basin area, which resulted in the final amalgamation of the Qinling mireo-plate with Yangtze plate and North China plate and greatly thinning of Qinling crust as well as the multi-layer th~＇ust nappe in the south Qinling mountain area. Eventually, the thin-skinned structure of imbricated thrust from north to south is formed. Regional tectonic stress is given priority to north-south direction. After experiencing four periods of tectonic deforma- tion, multiphase tectonic deformation style is formed in the southern Qinling mountain area, and also the magmatic activity is very ac- tive. After main tectonic mineralization period formed in Indo - China epoch, then overprinted by the mineralization formed Yanshan period, numerous gold polymetallie orogenic type deposits are formed in the basin area.

关 键 词：南秦岭 镇旬盆地 微细浸染型金矿 成矿地质特征 动力学机制 

分 类 号：P618.51[天文地球—矿床学]