A型花岗岩的实质是什么?  

A-type granite: what is the essence?

作　　者：张旗[1] 冉皞[2] 李承东[3] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国地质大学地球科学与资源学院,北京100083 [3]中国地质调查局天津地质矿产研究所,天津300170

出　　处：《岩石矿物学杂志》2012年第4期621-626,共6页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金重大研究计划资助项目(91014001;90714007;90714011)

摘　　要：A型花岗岩是富碱、贫水的花岗岩类,地球化学上以贫Al、Sr、Eu、Ba、Ti、P为特征,形成于低压高温条件下,对源岩没有选择。A型花岗岩的实质为:在低压下部分熔融形成的花岗岩类,大多产于地壳伸展减薄的构造背景中。A-type granites are alkali-rich and water-Ix）or granitoids characterized geochemically by Ix）or Al, Sr, Eu, Ba, Ti and P. A-type granite was formed under the low pressure and high temperature conditions, and their source rocks had no choice. The essence of the A-type granites is that granitic magma melted under low pressure, and they were mostly produced in the tectonic setting of crustal extension and thinning.

关 键 词：A型花岗岩 实质 低压 构造背景 

分 类 号：P588.121[天文地球—岩石学]