| 对西藏岗巴上白垩统的新认识 |
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| 引用本文： | 万晓樵,赵文金,李国彪.对西藏岗巴上白垩统的新认识[J].现代地质,2000,14(3):281-285. |
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| 作者姓名： | 万晓樵 赵文金 李国彪 |
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| 作者单位： | 中国地质大学地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家重点基础研究发展规划项目!(编号 :G1998
0 40 80 0 )，国家自然科学基金! (编号 :49872 0 0 3 ) |
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| 摘 要： | 在前人研究的基础上对岗巴地区上白垩统的划分做了厘定 ,进一步建立了晚白垩世的 1 2个浮游有孔虫化石带。根据岩性特征及化石带的研究 ,上白垩统被划分为赛诺曼期至土仑早期的冷青热组 ;土仑中期至三冬期的岗巴村口组和康潘期至马斯特里赫特期的宗山组。该区赛诺曼期与土仑期的界线位于冷青热组上部 ,以 H elvetoglobotruncana praehelvetica的初现为标志。
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| 关 键 词： | 岗巴 上白垩统 地层划分 |
| 修稿时间： | 2000-05-08 |
Restudy of the Upper Cretaceous in Gamba, Tibet |
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| Wan Xiaoqiao,Zhao Wenjin,Li Guobiao.Restudy of the Upper Cretaceous in Gamba, Tibet[J].Geoscience——Journal of Graduate School,China University of Geosciences,2000,14(3):281-285. |
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| Authors: | Wan Xiaoqiao Zhao Wenjin Li Guobiao |
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| Abstract: | The marine Cretaceous in Gamba was further subdivided by Wen Shixuan,Wang Yigang and Wan Xiaoqiao. After more detailed study in recent years, the Upper Cretaceous sequence has been revised and 12 planktonic foraminiferal zones have been recognized by the present authors. According to the lithology and the bio zones, the Upper Cretaceous is subdivided into the Cenomanian to early Turonian Lengqingre, middle Turonian to Coniacian Gambacunkou and Campanian to Maastrichtian Zongshan formations. The Cenomanian and Turonian boundary is placed at the upper part of the Lengqingre Formation and characterized by the first appearance of Helvetoglobotruncana praehelvetica. |
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| Keywords: | Gamba Upper Cretaceous stratigraphic division |
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