西藏拉轨岗日核杂岩盖层变质分带特征及其地质意义  

Characteristics and Geological Meaning of Metamorphic Zonation of Top Laguigangri Metamorphic Core Complex, Tibet

作　　者：袁晏明[1] 李德威[1] 张雄华[1] 卢练[1] 李启龙[2] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]武汉电力职业技术学院,湖北武汉430079

出　　处：《地球科学（中国地质大学学报）》2003年第6期690-694,共5页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局"1:2 5万定结幅;陈塘区幅 (国内部分 )区域地质调查"项目(No.20001300009231).

摘　　要：藏南拉轨岗日由一系列链状的热穹隆构成,总体呈东西向延伸,每一个热穹隆是一个变质核杂岩,核部发育大量变质岩,基底与盖层之间发育拆离断层.通过对拉轨岗日变质带及其特征变质矿物进行化学成分分析和温度压力估算,得出拉轨岗日变质带的分带规律及矿物成分、变质温度、压力、深度的变化规律,为拉轨岗日变质核杂岩的热活动提供了佐证.Laguigangri Mountains are composed of a series of chain-like swellings trending west and east. They all are vaults where there are a lot of metamorphic rocks and detachment faults, and so they are naturally related to each other. The research of chemical composition and metamorphic zonation and estimation of p-T of characteristic metamorphic minerals from metamorphic zone in Laguigangri has revealed the regularity of composition, temperature and pressure and metamorphic depth. This will evidence the activities of the metamorphic core and the detachment fault.

关 键 词：变质分带 化学成分 变质核杂岩 拉轨岗日 西藏 

分 类 号：P58[天文地球—岩石学]