A型花岗岩的研究进展及意义  

A-type Granites:Research Progress and Implications

作　　者：贾小辉[1,2] 王强[1] 唐功建[1,2] 

机构地区：[1]中国科学院广州地球化学研究所同位素年代学与地球化学重点实验室,广东广州510640 [2]中国科学院研究生院,北京100049

出　　处：《大地构造与成矿学》2009年第3期465-480,共16页Geotectonica et Metallogenia

基　　金：中国科学院知识创新项目(KZCX2-YW-128);广东省;国家自然科学基金项目(7006313;40673037和40572042)的资助

摘　　要：A型花岗岩主要形成于伸展的构造背景中,是构造环境识别的重要岩石学标志之一。由于形成于特殊的构造背景和重要的地球动力学意义,A型花岗岩的研究一直得到广泛的关注,但是仍旧有许多问题(如命名、分类和成因等)在争论之中。本文从下面几个方面对A型花岗岩的研究现状进行了较系统的总结:(1)A型花岗岩的概念及特征;(2)A型花岗岩与高分异I、S型花岗岩的区别;(3)A型花岗岩的物质来源及成因模式;(4)A型花岗岩的实验岩石学成果;(5)A型花岗岩的分类;(6)A型花岗岩的构造背景及动力学意义。A型花岗岩在形成过程中斜长石、斜方辉石可能为主要的残留或分离结晶矿物相。除了传统的A1(非造山)、A2(后碰撞)分类外,"还原型"和"氧化型"的分类方案最近也受到广泛关注。A-type granites have attracted wide attentions owing to their special tectonic settings and important geodynamic implications. However, some topics （e. g. , nomenclature, classification and petrogenesis） on the A-type granites have been currently disputed. In this contribution, we mainly introduce the recent progress for the study on the A-type granites in the following aspects ： （ 1 ） the definition and characteristics, （2） the differences between the A-type granites and highly fractionated I- and S-type granites, （3） source and petrogenesis, （4） progresses of experiment petrology, （5） classification and （6） tectonic setting and geodynamic implications. Plagioclase and ofthopyroxene are main residual or fractionational minerals during the formation of the A-type granite. Besides the traditional classification of A1/A2 for the A-type granites, another classification regarding reduced and oxidized A-type granites has also attracted wide attentions. The A-type granites were mainly generated in an extensional setting, and are one of important petrologic symbols for a distinguishing tectonic setting.

关 键 词：A型花岗岩 实验岩石学 物质来源 岩石成因 构造环境 

分 类 号：P588.12[天文地球—岩石学]