湘西北镍钼多金属喷气沉积矿床的地球化学特征  

GEOCHEMISTRY OF Ni Mo POLYMETALLIC EXHALATION SEDIMENT ORE DEPOSIT IN NORTHWESTERN HUNAN

作　　者：李有禹[1] 

机构地区：[1]湘潭矿业学院

出　　处：《地球化学》1997年第3期89-96,共8页Geochimica

基　　金：煤炭部煤炭科学基金

摘　　要：湘西北镍钼金属矿床，矿石中Ｎｉ、Ｍｏ、Ｐｔ族和Ａｓ、ＳＥ等元素高度富集。矿石δ３４Ｓ（－１３．０‰—－１７．９‰）与围岩δ３４Ｓ（＋１６．６‰—＋２４．９‰）截然不同，是硫源不同所致。硅岩的氧同位素值δ１８ＯＳＭＯＷ＝１８．１２‰—２２．５‰，可能与海底喷流有关。矿石的ＲＥＥ值比围岩高数十倍，属亏Ｃｅ、亏Ｅｕ、弱富ＬＲＥＥ型。上述地球化学特征表明了湘西北镍钼多金属矿床的形成特征。The Ni-Mo polymetallic deposit in northwestern Hunan is highly enriched by Ni, Mo, Ptgroup elements and As, SE, and etc. The difference of δ 34 S between ores (-13.0‰—-17.9‰) and country rock (+16.5‰—+24.9‰) is distinct, and this was caused by two kinds of sulfur source. The oxygen isotope value ( δ 34 O SMOW =18.2‰—22.55‰) in silicalite is large and positive which may be related to submarine exhalation. The value of ΣREE in ore , is tens times higher than that in country rock, the REE distribution pattern of the ores belongs to the type of weak rich LREE, in which Ce and Eu are depleted. The above geochemical characteristics indicate that the formation of Ni-Mo Polymetallic deposit in northwestern Hunan is related to submarine exhalation.

关 键 词：镍矿床 钼矿床 多金属矿床 喷气沉积 地球化学 

分 类 号：P618.630.4[天文地球—矿床学] P618.20[天文地球—地质学]