论雅鲁藏布大峡谷地区冈底斯岛弧花岗岩带  

The Gangdise island-arc granite zone along the Yarlung Zangbo Grand Canyon, Xizang

作　　者：耿全如[1] 潘桂棠[1] 郑来林[1] 刘宇平[1] 孙志明[1] 欧春生 王小伟 

机构地区：[1]成都地质矿产研究所,四川成都610082 [2]兰州地质调查院,甘肃兰州730050

出　　处：《沉积与特提斯地质》2001年第2期16-22,共7页Sedimentary Geology and Tethyan Geology

摘　　要：雅鲁藏布大峡谷北部的冈底斯岛弧花岗岩带可分为若干亚带 ,但岩浆活动大致可分为两大期次 ,分别与两次大规模造山活动有关。喜马拉雅造山作用在本区形成大量中新世花岗岩体 ,分布在离雅鲁藏布结合带较近部位 ;本区北部大量的早侏罗世至晚白垩世花岗岩 ,据其空间展布、岩浆活动时间、成因类型和岩石组合特征分析 ,应与怒江特提斯洋的闭合造山有关 ,同时说明本次造山作用可能是中生代的一次长期的构造 岩浆活动。The Gangdise island-arc granite zone along the Yarlung Zangbo Grand Canyon, Xizang may be subdivided into several subzones, generally representing two-phases of magmatism and orogeny in this region. The Himalayan orogeny resulted in the widespread occurrence of the Miocene granitic batholiths nearer to the Yarlung Zangbo suture zone. The Early Jurassic and Late Cretaceous granites in the northern part of the study area should be relevant, in terms of the spatial distribution, timing of magmatic activity and genetic types of the granites,to the Nujiang Ocean closure and orogeny which may represent a long period of tectonism and magmatism during the Mesozoic.

关 键 词：雅鲁藏布大峡谷 冈底斯岛弧花岗岩带 造山作用 成因 岩浆活动 

分 类 号：P588.121[天文地球—岩石学]