摘要
商南花岗岩体位于北秦岭造山带商丹断裂北侧，属新元古代花岗岩侵入体。岩石学、岩石地球化学特征研究表明，岩体具Ｉ型或Ｓ型花岗岩的双重特征，属于Ｈ型花岗岩；在构造环境上，又具有火山弧型和同碰撞型花岗岩特点，成岩物质来源于壳幔混合源，形成于华北与扬子古陆块在晋宁期由活动陆缘向碰撞带构造环境转变过渡时期，岩石构造类型属碰撞前（火山弧型）－同碰撞型花岗岩。
The Shangnan granite pluton is located on the north side of the Shangnan-Denfeng fault in the North Qinling orogenic belt and belongs to Neo-Proterozoic pluton. The features of petrolty and lithogeochmistry of the granite pluton indicate that the pluton has double characteristics of I-type and S-type granites, being of H-type granite which has features of volcanic are and syn-collision type granites. The diagenetic mass of the pluton derived from the source of crust-mantle mixed. The pluton formed during transitional stage from active continental margin to collison tectonic setting between the North China and the Yangtze ancient lands in the Jinning Pened.
关键词
花岗岩
地球化学
岩体成因
构造环境
北秦岭
Shangnan granite
geochemistry
orgin
tectonic setting
Neo-Proterozoic
north Qinling
