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Oligocene slow and Miocene–Quaternary rapid deformation and uplift of the Yumu Shan and North Qilian Shan: evidence from high-resolution magnetostratigraphy and tectonosedimentology

By
Xiaomin Fang
Xiaomin Fang
Key Laboratory of Continental Collision and Plateau Uplift & Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Shuangqing Road 18, 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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Dongliang Liu
Dongliang Liu
Key Laboratory of Continental Collision and Plateau Uplift & Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Shuangqing Road 18, Beijing 100085, ChinaKey Laboratory of Continental Dynamics of the Ministry of Land and Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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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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Shuang Dai
Shuang Dai
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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Qingquan Meng
Qingquan Meng
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

Most existing tectonic models suggest Pliocene–Quaternary deformation and uplift of the NE Tibetan Plateau in response to the collision of India with Asia. Within the NE Tibetan Plateau, growth of the terranes was suggested to progress northeastward with the Yumu Shan (mountain) at the northeasternmost corner of the Qilian Shan (mountains) being uplifted only since about 1 Ma ago. Here we present a detailed palaeomagnetic dating and tectonosedimentological measurement of Cenozoic sediments in the eastern Jiuquan Basin related to the deformation and uplift of the North Qilian Shan and Yumu Shan. The results show that the eastern Jiuquan Basin is a Cenozoic foreland basin and received sediments at about 27.8 Ma at the latest. Eight subsequent tectonic events at about 27.8, 24.6, 13.7–13, 9.8–9.6, 5.1–3.6, 2.8–2.6, 0.8 and 0.1 Ma demonstrate the development of the foreland basin in response to Oligocene–Quaternary uplift of the North Qilian Shan and subsequent propagation of thrust–fold system owing to collision of India with Asia. The Yumu Shan is the late phase of deformation front in the thrust–fold system and commenced rapid uplift at about 9.8–9.6 Ma at the latest. A rigid block-floating model is proposed to interpret the mechanism of this deformation and uplift history.

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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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