青藏高原南部碰撞造山过程中的大陆地壳生长作用  

Continental crust growth during the process of collision orogeny in the southern Tibet Plateau

作　　者：龙晓平 闫浩瑜 舒楚天 吴宾 王敬宇 朱喜 LONG Xiaoping;YAN Haoyu;SHU Chutian;WU Bin;WANG Jingyu;ZHU Xi(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi′an 710069,China;State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China)

机构地区：[1]西北大学地质学系/大陆动力学国家重点实验室,陕西西安710069 [2]中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广州510640

出　　处：《西北大学学报（自然科学版）》2019年第5期659-680,共22页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金项目(41522202);中科院先导专项项目(XDB03010600);大陆动力学国家重点实验室创新团队项目资助

摘　　要：长英质的大陆地壳是地球区别于其他星球的重要特征之一。传统观点认为大陆地壳的生长主要发生于俯冲增生型造山带,经典的陆陆碰撞造山带大陆地壳的生长并不显著,主要以地壳的重熔改造为主。青藏高原是全球最经典的陆陆碰撞造山带之一,然而近年来的研究揭示青藏高原南部的冈底斯带发育大量具有亏损同位素组成的与碰撞造山过程有关的岩浆岩,说明碰撞造山过程中也可以发生显著的地壳生长作用。文中聚焦冈底斯带岩浆岩,以冈底斯岩基和林子宗火山岩为研究对象,综述了相关岩石地球化学研究进展,探讨了碰撞造山过程相关的岩浆作用与地壳生长的关系,并分析了可能的地壳生长机制。The felsic continental crust of earth is one of the key features that distinguish it from other planets.According to the traditional view,the growth of continental crust mainly occurs in the subduction accretionary orogenic belt,and it is not significant in the classical continent-continent collisional orogenic belt,in which the crust has been reworked by remelting.The Tibet Plateau is one of the most classical continent-continent collisional orogenic belts in the world.However,recent studies have revealed that a large number of magmatic rocks with depleted isotopic compositions are developed in the Gangdese belt in the south Tibet Plateau,indicating that significant crustal growth can also take place in the process of collision orogeny.In this paper,we focus on the magmatic rocks in the Gangdese belt and take the collision-related Gangdese batholith and the Linzizong volcanic sequence as research objects.We have summarized the recent petrogeochemical progresses of these magmatic rocks and discussed the relationship between magmatism and crustal growth,and the likely crustal growth mechanism in the process of collision orogeny.

关 键 词：青藏高原 碰撞造山带 大陆地壳 生长机制 拉萨地块 

分 类 号：P542[天文地球—构造地质学]