Syntectonic growth strata and implications for late Cenozoic tectonic uplift in the northern Tian Shan,China |
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| Authors: | Jimin Sun Zhenqing Zhang |
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| Institution: | 1. School of Earth Sciences, Zhejiang University, Hangzhou 310027, China;2. Research Center for Structures in Oil and Gas Bearing Basins, Ministry of Education, Hangzhou 310027, China;3. School of Agriculture and Environment, The University of Western Australia, Crawley, Western Australia 6009, Australia;4. Key Laboratory of Submarine Geoscience, Second Institute of Oceanography, State Ocean Administration, Hangzhou 310012, China;1. Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710075, China;3. Laboratoire Géosciences Rennes, CNRS-UMR6118, Université Rennes 1, Observatoire des Sciences de l''Univers, Rennes 35042, France;4. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;5. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;1. Key Laboratory of Western China''s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. School of Earth Sciences & Key Laboratory of Western China''s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China;3. Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, 35137 Padova, Italy;1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences;3. Department of Geology, The University of Leicester, Leicester LE1 7RH, UK;1. School of Earth Sciences & Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou University, Lanzhou 730000, China;2. Key Laboratory of Petroleum Resources, Gansu Province & Key Laboratory of Petroleum Resources Research, CAS, Lanzhou 730000, China |
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| Abstract: | Propagation of faults and folds in the foreland basins of Tian Shan is an important process accommodating Cenozoic crustal shortening and mountain building, but little is known about the accurate time of the Cenozoic tectonic deformation. Based on growth strata and age determination, we show that syntectonic growth strata began to develop in the middle part of Tian Shan since 6 Ma ago. Geometry analysis indicates that formation of the growth strata is associated with progressive fold-limb rotation. Formation of the growth strata is contemporaneous with the tectonic deformation in the thrusting and folding zones. Together with the remarkable increase of sedimentation rate as well as the accumulation of coarse molasse deposits, we conclude that the late Cenozoic crustal shortening and mountain building in the region initiated since about 6 Ma and lasted to the early Pleistocene, as a consequence of intracontinental deformation within the India–Eurasia convergent system. |
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