湖南宝山铜-钼多金属矿床成岩成矿的U-Pb和Re-Os同位素定年研究
U-Pb and Re-Os isotope geochronology of Baoshan Cu-Mo polymetallic ore deposit in Hunan province.
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摘要: 湖南宝山是一个Cu-Mo-Pb-Zn-Ag多金属矿床,成因上与花岗斑岩、花岗闪长斑岩关系密切,矿床以宝岭倒转背斜(宝山中区)为中心,空间上具有明显的蚀变与矿化分带,其中心部位(宝山中区)的矿体产在花岗闪长斑岩(花岗斑岩)的内外接触带,围岩蚀变主要为矽卡岩化,成矿元素组合以Cu-Mo为主,而宝山东区、宝山西区及北部的财神庙矿区则主要为产于石炭系碳酸盐岩中的铅锌银矿化.通过对与成矿作用关系密切的花岗闪长斑岩中锆石SHRIMP U-Pb同位素测年,获得了高精度的花岗闪长斑岩的成岩年龄为158±2Ma(MSWD=0.26,Probability=0.61,n=12),与前人(伍光英等,2005)的SHRIMP数据合并计算则可得到一个161±1Ma(MSWD=0.66,Probability=0.42,n=23)的高精度U-Pb和谐年龄.该年龄可以代表宝山矿区中酸性小岩体的成岩年龄.通过对含矿矽卡岩中辉钼矿Re-Os同位素测年,获得辉钼矿的成矿年龄为160±2Ma.因此,本文认为宝山矿床成岩与成矿具有同时性,花岗闪长斑岩与宝山矿床的形成有成因联系.通过对区域上已获得的成岩-成矿年龄资料的综合对比分析,表明湘南乃至整个南岭中段地区中生代大规模岩浆作用与成矿第一高峰期为155～165Ma,宝山多金属矿床正是华南这一高峰期的产物.这为进一步研究区域成矿规律提供了重要同位素年代学依据.
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