藏北唐古拉山地区沱沱河组孢粉组合及其地层意义

段其发; 张克信; 王建雄; 姚华舟; 卜建军

Volume 32 Issue 5

Sep. 2007

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Article Navigation > Earth Science > 2007 > 32(5): 629-637

DUAN Qi-fa, ZHANG Ke-xin, WANG Jian-xiong, YAO Hua-zhou, BU Jian-jun, 2007. Sporopollen Assemblage from the Totohe Formation and Its Stratigraphic Significance in the Tanggula Mountains,Northern Tibet. Earth Science, 32(5): 629-637.

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Sporopollen Assemblage from the Totohe Formation and Its Stratigraphic Significance in the Tanggula Mountains,Northern Tibet

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Yichang Institute of Geology and Mineral Resources, Yichang 443003, China

Received Date: 2007-06-16
Publish Date: 2007-09-25

Abstract

Abstract

The Cenozoic fluvial redbeds are widely exposed in the Tanggula mountains. Dating these!redbeds can provide very important data for understanding the geological history of the Tibetan plateau. The sporopollen assemblage found from the upper part of the Totohe formation are characterized by the dominace of angiospermous pollen, most of the sporopollens being the common elements of Paleogene. Among the angiospermous pollen, there are plenty of tricolpate and tricolporate pollen grains of various kind, mainly including Quercoidites (especially Q. minutus, Q. microhenrici) , Meliaceoidites, Pokrovskaja, and Tricolporopollenites, etc., and the porate pollen is very low in quantity. There is a small amount of herbaceous pollen, such as Scabiosapollis, Labitricolpites, Randiapollis, and Tubulifloridites, as well as sporadic old pollen in these assemblages, such as Classopollis, Pentapollenites, and Jianghanpollis. The quantity of gymnospermous pollen is not high, and the pteridophyte spore is sporadic in the assemblage. Based on the analysis of the characteristics of the sporopollen assemblages, we conclude that the geological age of the upper part of the Totohe Formation is middle and late Eocene, which can provide new basis for further improvement of the Cenozoic stratigraphic system in the Tanggula mountains, northern Tibet.
- the Totohe formation,
- Palynological assemblage,
- Eocene,
- the Tanggula mountains

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Sporopollen Assemblage from the Totohe Formation and Its Stratigraphic Significance in the Tanggula Mountains,Northern Tibet

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