地球学报2026，Vol.47Issue(3)：629-643,15.DOI:10.3975/cagsb.2025.072321
西藏雅鲁藏布江缝合带西段龙拉多蛇绿岩成因及其动力学背景
Genesis and Geodynamic Setting of the Longladuo Ophiolite from the Western Section of the Yarlung-Zangbo Suture Zone,Xizang
摘要
Abstract
OIB-type ophiolites have formed in different sections along the Yarlung-Zangbo Suture Zone.However,research results regarding the genetic mechanisms and tectonic settings of OIB-type ophiolites are debatable.This study focused on the geochemistry and geochronology of newly discovered OIB-type ophiolites in the Longladuo area of the western section of the suture zone.The results showed that the Longladuo ophiolites formed during 140-142 Ma in an intraplate extensional tectonic environment.The parental magma was formed by the partial melting of approximately 10%spinel and garnet lherzolite.During the magmatic evolution process,it experienced fractional crystallization of minerals such as olivine and pyroxene.The OIB-type ophiolites in the Yarlung-Zangbo Suture Zone may have originated from the mantle plume magmatism during the ocean basin expansion stage in Late Jurassic-Early Cretaceous.关键词
雅鲁藏布江缝合带/蛇绿岩/地球化学/地质年代学/西藏南部Key words
Yarlung-Zangbo suture zone/ophiolite/geochemistry/geochronology/southern Xizang分类
天文与地球科学引用本文复制引用
侯云岭,贺娟,陈颖辉,李江寒..西藏雅鲁藏布江缝合带西段龙拉多蛇绿岩成因及其动力学背景[J].地球学报,2026,47(3):629-643,15.基金项目
本文由云南省教育厅科学研究基金项目(编号:2023J1278)、云南省科技厅基础研究专项面上项目(编号:202301AT070012)、滇西应用技术大学人才引进科研启动项目(编号:2022RCKY0004)联合资助. This study was supported by Yunnan Provincial Department of Education Scientific Research Fund(No.2023J1278),Yunnan Fundamental Research Projects(No.202301AT070012),and West Yunnan University of Applied Sciences(No.2022RCKY0004). （编号:2023J1278）
