浙江绍兴花岗闪长岩的地质地球化学和含金特征

绍兴花岗闪长岩小岩株侵入在元古宙双溪坞群的细碧-石英角斑岩火山岩系之中。绍兴-江山深大断裂控制了矿田和岩株的构造。岩株可划分三个相带。本文详细研究了花岗闪长岩的构造以及三个相带的岩石成分。根据岩石化学和微量元素化学分析、簇群分析及同位素值的研究等证实,此侵入岩体和它的围岩主要来源于上地幔岩浆源。我们在此岩株的断裂和构造破碎带及其与火山岩的接触带中,圈定了四个有远景的金-银矿化带。

GEOLOGY, GEOCHEMISTRY AND GOLD-BEARING CHARACTERISTICS OF THE SHAOXING GRANODIORITE IN ZHEJIANG PROVINCE

The granodiorite is of a small stock intruding into the Proterozoic spilite-quartz keratophyre of the Shuangxiwu Group. Structures ofthe ore-field and the stock are controlled by the Shaoxing-Jiangshan deep fault. Three lithofacies zones parallel to the stock have beenrecognized. The ore field and granodiorite structures primarily trend NE, NW and EW. The central facies of the stock is of typical gran-odiorite. Based on petrochemical and trace element data, cluster analyses and isotope study. it is proved that the intrusive unit and its ex-trusive host rocks are mainly derived from the upper mantle. The granodiorite formed in Xuefeng period. 650-700C. at a depth ofabout 3 km. Four prospective gold-silver mineralization zones within and outside the stock have been recognized.