| 西藏岗巴晚白垩世有孔虫动物群与海平面变化 |
| |
| 引用本文： | 赵文金.西藏岗巴晚白垩世有孔虫动物群与海平面变化[J].高校地质学报,2001,7(1):106-117. |
| |
| 作者姓名： | 赵文金 |
| |
| 作者单位： | 1. 中国地质大学（北京） 地球科学与资源学院 10083; 2. 中国科学院古脊椎动物与古人类研究所，北京100044; |
| |
| 基金项目： | 国家自然科学基金!项目 (4 9872 0 0 3)，国家重点基础研究发展规划项目! (G19980 40 80 0 ) |
| |
| 摘 要： | 西藏南部岗巴地区上白垩统的有孔虫动物群十分丰富，经鉴定共有52属130种。根据岩性，该地区上白垩统可以划分出三个最基本的岩石地层单位：冷青热组、岗巴村口组及宗山组。依据其中有孔虫的形态结构、生态环境、系统演化及地史分布等特征，可以划分出五个主要的有孔虫动物群，Rotalipora动物群，Whiteinella-Helvetoglobotruncana动物群，Dicarinella-Marginotruncana动物群，Globotruncana-Globotuncanita动物群及Orbitoides-Omphalocyclus动物群。这五个有孔虫动物在晚白垩世相继绝灭，其绝灭与古水深有着十分密切的关系，主要是受海平面变化的影响。
|
| 关 键 词： | 海平面变化 有孔虫动物群 晚白垩世 西藏 生态环境 海侵事件 形态结构 |
| 文章编号： | 1006-7493(2001)01-0106-12 |
| 收稿时间： | 2001-03-20 |
| 修稿时间： | 2000年3月14日 |
Late Cretaceous Foraminiferal Faunas and Eustatic Change in Gamba Area,Southern Tibet |
| |
| ZHAO Wen-jin.Late Cretaceous Foraminiferal Faunas and Eustatic Change in Gamba Area,Southern Tibet[J].Geological Journal of China Universities,2001,7(1):106-117. |
| |
| Authors: | ZHAO Wen-jin |
| |
| Institution: | China University of Geosciences, Beijing 100038, China |
| |
| Abstract: | The Zongshan section in Gamba of southern Tibet has long been considered as the standard section for the Cretaceous of the Tethyan Himalayas.The Late Cretaceous strata are well exposed in this area and containabundant foraminife ral fossils,from which 130 species of 52 genera have been identified.The rocks are mostly marine carbonates.Systematic studies of the microfauna and petrolog y have been conducted to establish anew stratigraphic framework for this area and the relationship between the foraminiferal faunas and the sea-level changes .
The Late Cretaceous strata in this area can be subdivided into three Formations,which are (inascending order) the Lengqingre Formation,Gangbacunkou Formationand Zongshan Formation.They are roughly of the Cenomanian to early Turonian,m iddle Turonian-Santonianand Campanian - Maastrichtianage.
Ten planktonic foraminiferal zones were recognized,which can be correlated with similar zones in Pakistan,Europe and America.Inaddition,5 foraminiferal fau nas,represented by Rotalipora fauna，Whiteinella-Helvetoglobotruncana fauna,Dicarinella-Marginotruncana fauna，Globotruncana-Globotruncanita fauna and Orbitoides-Omphalocyclus fauna,can be recognized.The evolution of the f orami niferal faunas in this area occured mainly in response to the eustatic changes w hich have affected biological niche of the microplankton. |
| |
| Keywords: | eustatic change foraminiferal faunas Late Cretaceous Gamba 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《高校地质学报》浏览原始摘要信息 |
| 点击此处可从《高校地质学报》下载免费的PDF全文 |
