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Neogene rotations in the Jiuquan Basin, Hexi Corridor, China

By
Maodu Yan
Maodu Yan
Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
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Xiaomin Fang
Xiaomin Fang
Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, ChinaKey Laboratory of Western China’s Environmental Systems (Ministry of Education of China) and College of Resources and Environment, Lanzhou University, Gansu 730000, China
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Rob Van Der Voo
Rob Van Der Voo
Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA
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Chunhui Song
Chunhui Song
Key Laboratory of Western China’s Environmental Systems (Ministry of Education of China) and College of Resources and Environment, Lanzhou University, Gansu 730000, China
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Jijun Li
Jijun Li
Key Laboratory of Western China’s Environmental Systems (Ministry of Education of China) and College of Resources and Environment, Lanzhou University, Gansu 730000, China
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Published:
January 01, 2013

Abstract

Vertical-axis rotations of blocks in/around the Tibetan Plateau can be attributed to the India–Asia collision. Study of the vertical-axis rotations of these blocks will increase our understanding of the mechanisms and kinematics of continent–continent collisions. We report here a new palaeomagnetic study of rotations using data from four localities (five magnetostratigraphy sections) in the Jiuquan Basin. Our study indicates that the mean declinations of each section are different from each other, similar to what has been observed in the other localities in the NE Tibetan Plateau. However, using the mean directions of every 100 m of section, we observe that the four localities have similar sequential patterns of rotations during the last 13 Ma: significant continuous counterclockwise before c. 8.0 Ma, insignificant rotations between 8.0–4.0 Ma, and slight clockwise rotation after 4.0 Ma. This indicates that, rather than being a record of spatially varying declinations, it is a temporal variation in the occurrence of regional rotations. Combined with other geological evidence, the rotation patterns may suggest two major tectonic activity phases of the northeastern Tibetan Plateau during the last 13 Ma: an eastward extrusion and strike-slip dominant phase before 8.0 Ma, a significant shortening and a rapid uplift dominant phase after 8.0 Ma.

Supplementary material:

Magnetostratigraphic results of the Hongshuiba and Wenshushan sections are available at: http://www.geolsoc.org.uk/SUP18540.

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Contents

Geological Society, London, Special Publications

Magnetic Methods and the Timing of Geological Processes

L. Jovane
L. Jovane
Universidade de Saão Paulo, Brazil
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E. Herrero-Bervera
E. Herrero-Bervera
University of Hawaii at Manoa, USA
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L.A. Hinnov
L.A. Hinnov
Johns Hopkins University, USA
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B. Housen
B. Housen
Western Washington University, USA
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Geological Society of London
Volume
373
ISBN electronic:
9781862396364
Publication date:
January 01, 2013

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