| 西藏西部狮泉河地区二叠纪和三叠纪牙形石的发现及其意义 |
| |
| 引用本文： | 纪占胜,姚建新,武桂春.西藏西部狮泉河地区二叠纪和三叠纪牙形石的发现及其意义[J].地质通报,2007,26(4):383-397. |
| |
| 作者姓名： | 纪占胜 姚建新 武桂春 |
| |
| 作者单位： | 中国地质科学院地质研究所,北京,100037 |
| |
| 基金项目： | 国家自然科学基金项目（编号：40302002、40502004和40572018）和中国地质调查局项目（编号：200313000054、1212010661312和1212010611702）资助成果.致谢：吉林省地质调查院刘贵忠高级工程师和国土资源部实物地质资料中心蒋忠惕研究员参加了野外考察工作,在此表示感谢. |
| |
| 摘 要： | 西藏西部阿里狮泉河地区的昂杰组、下拉组和左左组中发现牙形石化石。昂杰组的牙形石组合大致对比于中二叠世空谷期早中期Mesogondolella idahoensis-Vjalovognathus shindyensis组合带。下拉组顶部的牙形石组合大致对比于晚二叠世长兴期晚期Clarkina changxingensis带。左左组中含有早三叠世的Neospathodus sp.和Gladigondolella sp.,左左组和下拉组整合接触,左左组主体时代为三叠纪。狮泉河地区在早二叠世末期就开始由冈瓦纳相碎屑岩沉积转变为特提斯相碳酸盐岩沉积,在晚二叠世长兴期和早三叠世依然维持在海相沉积环境中。冈底斯西部在晚二叠世和三叠纪为古陆的观点有待于重新审视。
|
| 关 键 词： | 二叠纪 三叠纪 昂杰组 下拉组 左左组 牙形石 西藏西部 |
| 文章编号： | 1671-2552（2007）04-0383-15 |
| 收稿时间： | 2007-01-22 |
| 修稿时间： | 2007-03-16 |
Discovery of Permian and Triassic conodonts in the Shiquanhe area, Ngari, western Tibet, China and their significances |
| |
| JI Zhan-sheng,YAO Jian-xin,WU Gui-chun.Discovery of Permian and Triassic conodonts in the Shiquanhe area, Ngari, western Tibet, China and their significances[J].Geologcal Bulletin OF China,2007,26(4):383-397. |
| |
| Authors: | JI Zhan-sheng YAO Jian-xin WU Gui-chun |
| |
| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
| |
| Abstract: | Conodonts are discovered in the Angjie, Xiala and Zuozuo formations in the Shiquanhe area, Ngari, western Tibet. The conodont assemblage in the Angjie Formation is roughly correlated to the Middle Permian early-middle Kungurian Mesogondolella idahoensis-Vjalovognathus shindyensis Assemblage Zone, the conodont assemblage at the uppermost part of the Xiala Formation is roughly correlated to the Late Permian late Changxingian Clarkina changxingensis Zone. The Early Triassic conodonts Neospathodus sp. and Gladigondolella sp. are found in the Zuozuo Formation, which conformably overlies the Xiala Formation; therefore the age of the main part of the Zuozuo Formation is Triassic. The transition from the Gondwanic clastic sediments to Tethysian carbonate sediments in the Shiquanhe area started from the terminal Early Permian, and during the Late Permian Changxingian Stage and Early Triassic the Shiquanhe area still remained in a marine environment. So the view that western Gangdise was a land during the Late Permian and Triassic should be reconsidered. |
| |
| Keywords: | Permian Triassic Angjie Formation Xiala Formation Zuozuo Formation conodont western Tibet |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
