摘要
一、概述冈底斯花岗岩带长约２０００ｋｍ，宽近百公里，为一巨大构造－岩浆带，紧邻雅鲁藏布江缝合带呈近东西向展布，其向东绕过雅鲁藏布江大拐弯处的南迦巴瓦峰与察隅中酸性花岗岩带相连，再向南延至伯奇。同期还发育大量钙碱性火山岩。有关冈底斯花岗岩的研究已经积累...
Abstract The Gangdise granite belt is a tremendous structural magmatic zone about 2000 km long and nearly one hundred kilometres wide which lies closest to the Yarlung Zangbo suture on the Qinghai Xizang Plateau. Although numerous studies were conducted in the past years on the granites in the belt, the information about the enclaves is scarce. The present paper gives a more detailed description of the granodiorites and their mafic microgranular enclaves from the Gangdise granite belt. The results of research of the petrographic and lithologic characteristics have revealed that:(1)the mafic microgranular enclaves should be the products of magmatic crystallization, and (2)there once occurred a coexisting liquid phase of these enclaves and granites in this region. This implies that the further study may be made on the genetic relations between the Gangdise granites and their mafic microgranular enclaves, and on the dynamics of the magmatic activities via major, trace and rare earth elements from the granites and their enclaves, which, in turn, are significant for the approaches to the formation and evolution of the Qinghai Xizang Plateau.
出处
《沉积与特提斯地质》
CAS
CSCD
1998年第A01期94-99,共6页
Sedimentary Geology and Tethyan Geology
基金
地质矿产部重点研究课题
