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地质学报  2005 

西藏喜马拉雅瑞替阶和赫塘阶菊石组合及其生物年代学对比

, PP. 577-586

Keywords: 西藏喜马拉雅地区,三叠系/侏罗系界线,菊石组合

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Abstract:

基于西藏聂拉木拉弄拉地区的格米格剖面新近逐层采集的菊石及缝合线研究,已识别出晚三叠世瑞替阶Choristocerasmarshi组合,过渡带Neophyllites-Choristoceras组合,下赫塘阶Psilocerascalliphyllum组合和中赫塘阶Discamphiceraspleuronotum组合。作为东特提斯唯一的三叠系-侏罗系界线地层剖面,格米格菊石组合序列提供了特提斯范围内三叠/侏罗系界线菊石组合(或菊石带)以及地层对比的基础:Choristocerasmarshi组合可以和欧洲,南美的秘鲁和智利的MARSHI菊石带,北美的内瓦达,不列颠哥伦比亚(加拿大)等地CRICKMAYI菊石带比较。Neophyllites-Choristoceras组合可和北美的内瓦达侏罗系底部TILMANNI菊石带Neophyllites和Choristoceras共生动物群比较。Psilocerascalliphyllum组合能够和北阿尔卑斯地区CALLIPHYLLUM菊石带比较,证明北阿尔卑斯地区三叠系和侏罗系之间存在地层缺失。

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