| 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 |
| 西藏塔惹增地区下白垩统捷嘎组的厘定及其地质意义 |
| Determination of Jaguar Formation, Lower Cretaeous and Its Geological Significance in Tarezeng Area, Tibet |
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| DOI： |
| 中文关键词: 塔惹增地区 早白垩世晚期 腹足类化石 捷嘎组 西藏 |
| 英文关键词:Tazezeng area Late early Cretaceous Gastropod fossils Jiega formation Tibet |
| 基金项目:中国地质调查局项目（项目编号：12120114062301、1212011086035、1212011121230） |
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| 中文摘要: |
| 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 cfgerassimovi（ 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。 |
| 英文摘要: |
| 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. |
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