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地质论评  2006 

西藏南部珠穆朗玛峰地区三叠纪生物地层研究

Keywords: 三叠系生物地层层序生物化石组合带珠穆朗玛峰地区西藏南部

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Abstract:

本文对珠穆朗玛峰地区三叠系地层中的生物地层层序、古生物化石的产出状态、组合面貌和发育特征等进行了详细的研究,自下而上将区内三叠系划分出19个生物化石组合(带)。这些生物化石组合(带)分别是:①Oceraslatilobatum-Anchignathodotusparvus组合;②Ophicerassakuntala-lsarcicellaisarcica组合;③Gyronitespsilogyrus-Claraiaaurita-Neospathoduscristagalli组合;④Owenites-Neospathoduswaageni组合;⑤Procarnitesxizangensis-Neogondolellamilleri组合;⑥Neospathodustimorensis带;⑦Japonitesmangus-Neogondolellaregale组合;⑧Anacrochordicerasnodosus-Tulongospiriferstracheyi组合;⑨Paracertitestrinodosus-Neogondolellaconstricata组合;⑩Protrachycerasladinum-Daonellaindica-Neogondolellaexcelsa组合;⑾Indonesitesdieneri-Lilagginanobilis组合;⑿Haplotropites-Epigondolelladiebeli组合;⒀Parahaueritesacutus-Halobia-Neogondolellapolygnathiformis组合;⒁Nodotibetitesnodosus-Epigondolellaabneptis组合;⒂Griesbachites-Guembilites组合;⒃Indojiuwavitesangulatus-Epigondolellamultidentata-Himalayasaurstibetensis组合⒄Cyrtopleuritesbicrenatus带;⒅Pinacocerasmetternichi-Himavatitescolumbianus组合;⒆Tulongocardiumpluriraditum-Palaeocarditamansuyi组合。据此厘定了该区三叠系下统、中统和上统的界线。珠穆朗玛峰地区三叠系生物化石组合带的重新建立,提高了该区三叠系生物地层的研究程度,为开展青藏高原地区及其与全球的三叠系地层划分对比研究提供了科学依据。

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