广西都庞岭、海洋山花岗岩体地球化学特征对比

GEOCHEMICAL CONTRASTING OF DOUPANGLING AND HAIYANGSHAN GRANITES,GUANGXI

同处南岭西段的广西都庞岭岩体与海洋山岩体形成时代不同:前者是加里东晚期、印支晚期和燕山早期形成的复式岩体,以燕山早期花岗岩为其主体;后者以加里东晚期花岗岩为主。与两岩体有关的含矿性有明显的差异,区内已发现的钨锡矿矿床(点)主要产于燕山早期花岗岩中。水系沉积物地球化学特征对比分析表明:二者除在微量元素的初始丰度值、元素组合等方面具有一定相似之外,元素含量分布特征明显不一样,都庞岭燕山期花岗岩较海洋山岩体W、Sn、Bi等成矿元素丰度值更高,W、Sn、Bi、Mo富集趋势明显,而海洋山加里东期花岗岩以Ag、Pb、As、Sb等的后期富集为特征。

Doupangiing and Haiyangshan granitic bodies in the western Nanling are formed in different time. The former is a complex body formed in late Caledonian, late Indosinian and early Yanshanian. The latter is dominated by late Caledonian. There exist obvious differences of ore - bearing character for the granitic bodies. W and Sn deposits （spots） founded in the region are mainly located in the early Yanshanian granite. Comparison of stream sed- iment geochemistry survey show that distribution of element content are distinctly different, apart from a few similarity on the primary abundance of trace element and element association of the granitic bodies. Yanshanian Doupangling granitic body has high abundance of W, Sn and Bi and more enrichment of W, Sn, Bi and Mo than Haiyangshan granite body. Late enrichment of Ag, Pb, As and Sb is represented in the Caledonian Haiyangshan granite body.