钦-杭成矿带中成矿元素锑的物质来源探讨

摘 要]钦-杭成矿带是扬子陆块东南缘与华南褶皱系之间的巨型多金属成矿带,仅其中所发现的锑矿就占我国锑储量的87%。在扬子陆块江南古陆基底及各时期沉积盆地演化过程中,形成了富锑的地球化学场。矿带内各锑矿床矿石铅同位素组成变化与江南古陆基底及各时期盆地中沉积黄铁矿铅同位素组成十分相似,仅从赋矿围岩锑元素丰度和锑矿床矿石铅同位素组成两方面的探讨表明,矿带内锑成矿元素源于基底及盖层中各赋矿围岩。

Discussion on Sources of the Element Sb in the Qinzhou-Hangzhou Metallogenic Belt

Abstract:The great Qinzhou-Hangzhou polymetallic belt is located between the southeast margin of the Yangtze block and the South China fold system. The antimony deposits found in this belt account for about 87% of the total antimony reserves in China. As for its geological background, during the evolution of the southern Yangtze block and the periods of ancient continental basement sedimentary basins, the antimony-rich geochemical field was formed. Lead isotopic composition of antimony deposits in the metallogenic belt is very similar to that in the Jiangnan ancient land basement and sedimentary pyrite in the basins of varied periods. Evidence from abundance of the element Sb in ore-rock and lead isotopic composition of antimony deposits suggests that the sources of Sb element in the metallogenic belt are the ore-bearing country rocks of the basement and the cover.