作　　者： ; ;

机构地区： 南京大学地球科学与工程学院地球环境计算工程研究所

出　　处： 《地质学报》 1997年第2期161-169,共9页

摘　　要： 下扬子和南岭两个地区的华南型块状硫化物矿床在成分上有着显著的差异:前者有用金属以铜为主,铅、锌为次,并可综合利用金、银、钴和钼。矿石中放射性成因铅含量低,δ^(34)S于零值附近呈塔式分布,成矿流体具有高盐度和富钠特征。后者有用金属铅、锌与铜同样重要,并可综合利用银、锑、汞、铀、铋、铊和钼,矿石中放射性成因铅含量高,δ^(34)S呈离散型分布,成矿流体具有低盐度和富钾特征。这些差异主要受沉积盆地基底成分的控制,因而反映了成矿时大陆地壳成熟度的差异。不同成熟度大陆地壳的特征性组分可以通过海底淋滤-喷气、陆源沉积和中生代岩浆-热液的叠加而进入块状硫化物矿石。 Upper Palaeozoic intracontinental exhalative massive sulphide deposits occur in the Lower Yangtze and Nanling regions of South China. They have many.common features, e. g. , their ore-hosting strata are dominated by elastics, shales and carbonates with minor volcanites of basaltic, dacitic or rhyolitic composition; they were usually reworked by Mesozoc granitoids and related hydrothermal fluids and tend to coexist with late-stage skarn- and/or porphyry-type deposits. However, massive sulphide ores of the two regions are remarkably different both in metal and isotopic compositions and in properties of ore-forming fluids. Deposits of the Lower Yangtze region mainly contain Cu and minor Pb and Zn as well as recoverable Au, Ag, Co and Mo, whereas those of the Nanling region contain large amounts of Pb, Zn and Sn other than Cu with recoverable Ag, Sb, Hg, W, U, Bi, Tl and Mo. In comparison with the Lower Yangtze region , ores of the Nanling region usually have higher concentrations of radiogenic lead and widely-ranging positive or scattered distribution patterns of δ34S, and their fluid inclusions are usually enriched in potassium rather than sodium and normally have lower temperatures and salinities. The compositional contrasts are considered to have been induced by differences in composition of the basin basements and hence by varying maturity of continental crust during ore formation. There are sufficient evidence to demonstrate that the maturity of the continental crust of the Nanling region is higher than that along the Lower Yangtze River during the formation of their massive sulphide deposits.

关 键 词： 陆壳 成熟度 硫化物矿床 成分效应 铜矿床

领　　域： [天文地球] [天文地球] [天文地球] [天文地球]