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Science in China Series D: Earth Sciences

, Volume 44, Supplement 1, pp 243–250 | Cite as

Late Cenozoic magnetic polarity stratigraphy in the Jiudong Basin, northern Qilian Mountain

  • Zhao Zhijun Email author
  • Fang Xiaomin 
  • Li Jijun 
Article

Abstract

Late Cenozoic sediments in the Hexi Corridor, foreland depression of the Qilian Mountain preserved reliable records on the evolution of the Northern Tibetan Plateau. Detailed magnetic polarity dating on a 1150 m section at Wenshushan anticline in the Jiudong Basin, west of Hexi Corridor finds that the ages of the Getanggou Formation, Niugetao Formation and Yumen Conglomerate are >11-8.6 Ma, 8.6-4.5 Ma and 4.5-0.9 Ma respectively. Accompanying sedimentary analysis on the same section suggests that the northern Tibetan Plateau might begin gradual uplift since 8.6-7.6 Ma, earlier than the northeastern Tibetan Plateau but does not suppose that the plateau has reached its maximum elevation at that time. The commencement of the Yumen Conglomerate indicates the intensive tectonic uplift since about 4.5 Ma.

Keywords

Hexi Corridor paleomagnetic stratigraphy Tibetan Plateau uplift 

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Copyright information

© Science in China Press 2001

Authors and Affiliations

  1. 1.Faculty of GeographyNanjing Normal UniversityNanjingChina
  2. 2.National Laboratory of Western China’s Environmental Systems & College of Resources and EnvironmentLanzhou UniversityLanzhouChina

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