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西藏塔惹增地区下白垩统捷嘎组的厘定及其地质意义
引用本文:白培荣,熊兴国,李月森,马德胜,曾禹人,廖铸敏,蒋开源,张厚松,吴滔,黄建国,符宏斌,龙胜清.西藏塔惹增地区下白垩统捷嘎组的厘定及其地质意义[J].贵州地质,2018,35(3):197-204.
作者姓名:白培荣  熊兴国  李月森  马德胜  曾禹人  廖铸敏  蒋开源  张厚松  吴滔  黄建国  符宏斌  龙胜清
作者单位:贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081,贵州省地质调查院,贵州贵阳550081
基金项目:中国地质调查局项目(项目编号:12120114062301、1212011086035、1212011121230)
摘    要:笔者于西藏仲巴县塔惹增地区一带前人划分的一套早白垩世早期则弄群中发现了具有典型意义的、代表早白垩世晚期的Ampullina xainzaensis Yu,Ampullina cf. larteli Landerer,Tylostoma cf. brasilianus Maury,Pseudamaura cf. subfournaeti (Pcelincev),Gyrodes gaultiana Orbigny,Leviathania cf. gerassimovi(Pcelincev),Gymnentome cf. pizcuetana(Vilanova)等腹足类化石,以及较为丰富的中圆笠虫Mesorbitolina sp.和达克斯虫Daxia sp。表明在该区则弄群中至少有一部分以前没有被识别出的早白垩世晚期地层。通过岩石组合特征、基本层序、生物化石时代对比,将该套地层归属于捷嘎组。这一地层的确定为冈底斯带白垩系地层划分对比、地层格架建立提供了重要的依据,并丰富了该地层的古生物资料,且为中生代盆地的演化历史、古地理轮廓的确定提供了新的基础资料。

关 键 词:塔惹增地区  早白垩世晚期  腹足类化石  捷嘎组  西藏

Determination of Jaguar Formation, Lower Cretaeous and Its Geological Significance in Tarezeng Area, Tibet
BAI Pei-rong,XIONG Xing-guo,LI Yue-shen,MA De-sheng,ZENG Yu-ren,LIAO Zhu-min,JIANG Kai-yuan,ZHANG Hou-song,WU Tao,HUANG Jian-guo,FU Hong-bin and LONG Sheng-qing.Determination of Jaguar Formation, Lower Cretaeous and Its Geological Significance in Tarezeng Area, Tibet[J].Guizhou Geology,2018,35(3):197-204.
Authors:BAI Pei-rong  XIONG Xing-guo  LI Yue-shen  MA De-sheng  ZENG Yu-ren  LIAO Zhu-min  JIANG Kai-yuan  ZHANG Hou-song  WU Tao  HUANG Jian-guo  FU Hong-bin and LONG Sheng-qing
Institution:(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China,(Guizhou Geological Survey, Guiyang 550018, Guizhou, China and (Guizhou Geological Survey, Guiyang 550018, Guizhou, China
Abstract:In a Zenong group of early Cretaceous divided by the former in Tarezeng area of Tibet, some fossils which are typical and represent late Cretaeous are found, such as Ampullina xainzaensis Yu, Ampullina cf.larteli Landerer, Tylostoma cf.brasilianus Maury, Pseudamaura cf.subfournaeti (Pcelincev), Gyrodes gaultiana (Vilanva) Snails and so on, comparatively abundant Mesorbitolina sp. And Daxia sp. are also found. It means that part of late early Cretaceous stratum is unknown in Zenong formation of this area. According to the rock combination, basic sequence and biological fossil comparison, this strata is divided into jga formation. The determination of this strata afford important accordance for Cretaceous stratigraphic classification and correlation and stratigraphic framework establishment, enrich the paleontological information of this strata, it also provide new basic information for the evolution and palaeogeographic outline determination of Mesozoic basin.
Keywords:Tazezeng area  Late early Cretaceous  Gastropod fossils  Jiega formation  Tibet
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