Late Cenozoic tectonic activity and its significance in the Northern Junggar Basin,Northwestern China |
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| Authors: | Zhengle Chen Jian Liu Hongliang Gong Fengbin Han Stephanie Marion Briggs Enjiu Zheng Guo Wang |
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| Institution: | 1. Centre de Recherche Pétrographique et Géochimique, Université de Lorraine - CNRS, UMR 7358, 15 rue Notre Dame des Pauvres, B.P. 20, 54501 Vand?uvre lès Nancy, France;2. University of Montpellier, Géosciences Montpellier, UMR 5243, Place E. Bataillon, case 060, 34095 Montpellier Cedex 5, France;3. California Institute of Technology, Division of Geology and Planetary Sciences, 1200 E California Blvd, Pasadena, CA 91125, United States;4. University of California, Department of Earth, Planetary and Space Sciences, Los Angeles, CA 90095-1567, United States;5. Nanjing University, Department of Earth and Sciences, Nanjing, China;6. Department of Geography, University of Sheffield, Sheffield S10 2TN, UK;1. Subsurface Multi-scale Imaging Key Laboratory (SMIL) of Hubei Province, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, China;2. School of Earth Sciences, Zhejiang University, Hangzhou, China;3. ARC Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Department of Earth and Planetary Sciences, Macquarie University, New South Wales, Australia;4. College of Mathematics and Information Science, North China University of Water Resources and Electric Power, Zhengzhou, China |
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| Abstract: | The Dingshan area located in the northern part of the Junggar Basin of northwestern China is a significant prospect area for sandstone-type uranium deposits in China, where mainly Cenozoic rocks were deposited. The Cenozoic strata can be divided into four units according to the prior data and our own field observation. Sedimentary studies indicate that most Cenozoic strata were deposited under a hot and arid climate in a continental environment. The sedimentary facies are alluvial-fan, meandering-fluvial, and fluvio-lacustrine. Field investigation and interpretation of satellite images suggest that Cenozoic tectonics in the area is characterized by reactivation of early deep-seated thrusts, resulting in extensional fractures and formation of many small depressions in the shallow crustal level. Measurement of joint orientations suggests that regional shortening direction trends in north–south in the middle Pleistocene as indicated by the ESR (Electronic Spin Resonance) age of 0.1–0.4 Ma obtained from fault gouge and gypsum deposits. A four-stage sedimentation-tectonic evolution model of the northern Junggar Basin during the Late Cenozoic can be established based on reconstruction of sedimentary filling processes and Cenozoic tectonic movements. We suggest that landform evolution and groundwater movement are controlled by active tectonics, indicating that Late Cenozoic tectonic activities may also play important roles in the formation of sandstone-type uranium deposits. Therefore, a new metallogenic model for sandstone-type uranium deposits is proposed. |
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