Late Cenozoic magnetic polarity stratigraphy in the Jiudong Basin,northern Qilian Mountain |
| |
Authors: | Zhao Zhijun Fang Xiaomin Li Jijun |
| |
Affiliation: | 1.Faculty of Geography, Nanjing Normal University, 210097, Nanjing, China ;2.National Laboratory of Western China’s Environmental Systems & College of Resources and Environment, Lanzhou University, 730000, Lanzhou, China ; |
| |
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: | |
本文献已被 SpringerLink 等数据库收录! |
|