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雅鲁藏布大峡谷地区蛇绿混杂岩带初步研究
引用本文:耿全如,潘桂棠,刘宇平,郑来林.雅鲁藏布大峡谷地区蛇绿混杂岩带初步研究[J].沉积与特提斯地质,2000,20(1):28-43.
作者姓名:耿全如  潘桂棠  刘宇平  郑来林
作者单位:成都地质矿产研究所,四川,成都,610082
摘    要:雅鲁藏布大峡谷地区主要有南迦巴瓦群(Pt1nj)、大拐弯群(Mz)和冈底斯群(Pt1gd)三个岩石地层单元。其中大拐弯群主检分布在楔入体的东缘,主要由变玄武岩/辉绿岩、辉石岩、镁质橄榄岩、石英岩和大理岩等组成,岩石类型和化学成分特征经绿岩套类似。但其岩石化学性质与典型的大洋中脊蛇绿岩判差别较大,形成环境为具有陆壳性质的中等-慢速扩张的小型洋盆,属陆间海/弧后盆地。自45Ma以来,该地区经历了强烈的

关 键 词:雅钽藏布大峡谷  蛇绿混杂岩带  杂岩  蛇绿岩
收稿时间:1999/6/18 0:00:00
修稿时间:1999-06-18

The preliminary study of the ophiolitic melanges along the Yarlung Zangbo Grand Canyon, Xizang
GENG Quan-ru,PAN Gui-tang,LIU Yu-ping,ZHENG Lai-lin.The preliminary study of the ophiolitic melanges along the Yarlung Zangbo Grand Canyon, Xizang[J].Sedimentary Geology and Tethyan Geology,2000,20(1):28-43.
Authors:GENG Quan-ru  PAN Gui-tang  LIU Yu-ping  ZHENG Lai-lin
Institution:Chengdu I nstitute of Geology and Mineral Resources, Chengdu 610082, China
Abstract:Three lithostratigraphic units are recognized along the Yarlung Zangbo Grand Canyon, Xizang: Namjagbarwa Group (Pt 1nj), Daguaiwan Group (Mz) and Gangdise Group (Pt 1gd). The Daguaiwan Group intermediate between the Namjagbarwa Group and Gangdise Group is developed dominantly in the northeastern and southeastern parts of the Yarlung Zangbo Grand Canyon, and consists of metabasalts or diabases, pyroxenites, magnesian peridotites, quartzites and marbles. These rocks show many similarities in rock type and chemical composition to ophiolitic suites but differences in lithochemistry from typical mid oceanic ridge ophiolites. They are interpreted to form in a moderately to slowly extended small oceanic basin which has the features of the continental crust and may be ascribed to an intercontinental sea or a back arc basin. The intense folding, uplifting and denudation of the study area since 45 Ma allowed the lower crust to have been subjected to more extensive erosion to form the giant canyon.
Keywords:Yarlung Zangbo Grand Canyon  ophiolitic melange zone
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