New paleomagnetic constraints on rift basin evolution in the northern Himalaya mountains |
| |
| Institution: | 1. CAS Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100010, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences (CAS), Beijing 100101, China;3. College of Tourism and Resource Environment, Zaozhuang University, Zaozhuang 277160, China;1. Geowissenschaftliches Zentrum, Universität Göttingen, 37077 Göttingen, Germany;2. Department of Earth Sciences, Dalhousie University, Halifax, NS B3H 4R2, Canada;3. NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;4. Department of Geology, University of Leicester, LE1 7RH, UK;5. Department of Geological and Environmental Science, Stanford University, CA 94305, USA;6. University of Kashmir, Hazratbal, Srinagar, 190 006 Jammu and Kashmir, India;1. Department of Geosciences, Eberhard Karls University Tübingen, Wilhelmstrasse 56, D-72074 Tübingen, Germany;2. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;3. State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, CAGS, Beijing 100037, China;1. Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources, Institute of Geomechanics, CAGS, Beijing 100081, China;2. China University of Geosciences, Beijing 100083, China;3. Institute of Geology, CAGS, Beijing 100037, China;4. Xi''an Center of Geological Survey, CGS, Xi''an 710054, China;5. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;6. Jiangsu Team of Geological Survey Center of China Building Material Industry, Nanjing 211135, China;1. Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;3. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;2. Key Laboratory of Paleomagnetism and Tectonic Reconstruction, The Ministry of Land and Resources, Beijing 100081, China;3. College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China;4. Institute of Geology, China Earthquake Administration, Beijing 100029, China |
| |
| Abstract: | The late Cenozoic sediments in the rift basins in the northern Himalaya Mountains document important information about the uplift and deformation of the most active tectonic region in the Tibetan Plateau. However, these sediments have not been precisely dated, hindering our ability to address the basin development and termination associated with a series of uplifts in the southern Tibetan Plateau. Here, we report a detailed magnetostratigraphic study on the fluvio - lacustrine sedimentary sequence of the Dati Formation bearing abundant Hipparion forstenae fossils in the Dati Basin in the northern frontal region of the Himalaya Mountains. The 195 m – thick section yielded six normal and seven reversed polarity zones that correlate well with Chrons C3An.1r to C4r.2r of the geomagnetic polarity time scale, constraining the section age to ~8.6 – ~6.2 Ma. Together with the magnetostratigraphic results from other rift basins in the region, these results indicate that the horizons bearing the Hipparion fossils were deposited during the age interval of 7.1–6.5 Ma in the northern Himalaya Mountains. The regional tectonic activity and comprehensive magnetostratigraphic and sedimentologic comparisons suggest that the evolution of the rift basins in the northern Himalaya Mountains has involved three major stages since the late Cenozoic, i.e., (1) ~10.0–8.0 Ma, onset of the basins with fan delta facies; (2) ~8.0–3.0 Ma, expansion of the basins with mainly lacustrine facies; (3) ~3.0–1.7 Ma, shrinking and termination of the basins with alluvial fans. The basin evolutionary history indicates an accelerated tectonic uplift of the Himalaya Mountains at ~10.0 Ma, and two deformational events at ~3.0 Ma and at ~1.7 Ma. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
