南岭印支期花岗岩与钨锡成矿作用研究进展

华南中生代陆内环境成矿大爆发在区内形成了东部钨锡高温成矿省和西部金—锑—铅—锌低温成矿省，造就了世界级金属成矿区。华南中部的南岭成矿带是世界上钨锡多金属矿床分布最密集的区域之一，南岭在加里东期、印支期和燕山期都发育有与钨—锡成矿相关的成矿花岗岩，区内印支期的成矿强度明显弱于燕山期，对区内印支期岩体的研究相对滞后。本文在对比了南岭印支期钨锡花岗岩与不成矿花岗岩的地球化学特征并结合前人的研究发现可以结合花岗岩的高度的结晶分异、低镁、铁含量、高REE+Y、Nb+Ta值和Ti、P的强烈亏损来区分印支期钨—锡花岗岩与不成矿花岗岩。

Research progress on the relationship between Indosinian granite and tungsten—tin mineralization in Nanling metallogenic belt

The large scale mineralization occurring in South China block far away from active continental margins during the Mesozoic. It formed two distinct metallogenic provinces: the eastern tungsten—tin high temperature metallogenic province and the western gold—antimony—lead—zinc low temperature metallogenic province, establishing globally significant metallogenic regions. The Nanling metallogenic belt in central South China block, is one of the most densely distribution regions of tungsten—tin polymetallic deposits in this world. The Nanling metallogenic belt has developed mineralized granites related to tungsten—tin deposits during Caledonian, Indosinian and Yanshanian periods. During the Indosinian period, the metallogenic activity in the region was obviously weaker compared with the Yanshanian period, and research on Indosinian period rocks in Nanling area is relatively lagging behind. This article compares the geochemical features between Indosinian tungsten—tin granites and barren oreforming granites in Nanling. By integrating previous research findings, it is found that high crystallized differentiation, low magnesium iron content, high REE+Y, Nb+Ta values, and mightily depletion of Ti and P.