西藏申扎西南部甲岗雪山钨钼(铋)矿区嘎若二长花岗岩体的地球化学特征

Geochemical characteristics of the Garuo monzogranite in the Jaggang Xueshan W-Mo(-Bi) district, southwestern Xainza, Tibet, China

甲岗雪山钨钼(铋)矿床成矿作用受嘎若二长花岗岩体的控制。地球化学特征研究结果表明,嘎若岩体属于钙碱性岩系,为S型花岗岩。结合区域岩浆活动演化历史,判定嘎若岩体形成于碰撞挤压造山作用以后的陆内拉伸构造环境,源区具有壳幔混合带的性质。

The mineralization of the Jaggang Xueshan W-Mo（-Bi） deposit was controUed by the Garuo monzogranite. The geochemical study shows that the rock is S-type granite, belonging to the calc-alkaline suite. According to the geochemical characteristics, combined with the evolution of regional magnetism, the rock body occurred in an intracontinental extensional environment after collisional orogeny. The source region has the character of a crust-mantle mixing zone.