Inversion of topographic evolution using low-T thermal history: A case study from coastal mountain system in Southeastern China |
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| Institution: | 1. Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China;2. Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA;3. Low-T Lab, Shanghai 201101, China;1. Department of Earth and Planetary Sciences, Nehru Science Centre, University of Allahabad, Allahabad 211 002, India;2. National Center of Experimental Mineralogy and Petrology, 14 Chatham Lines, University of Allahabad, Allahabad 211 002, India;3. Geochronology Laboratory, Darcy Ribeiro Campus, University of Brasilia, Brasilia, Brazil;4. Museum für Naturkunde - Leibniz-Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany;1. University of Vienna, Department of Geodynamics and Sedimentology, Althanstr. 14, 1090 Wien, Austria;2. Nanjing University, Department of Earth Sciences, Xianlin Ave. 168, 21000 Qixia District, Nanjing, PR China;3. Jacobs University Bremen, Department of Physics and Earth Sciences, Campus Ring 1, 28759 Bremen, Germany;4. Universidade de Brasília, Instituto de Geociências, Campus Universitário Darcy Ribeiro, CEP 70910-900 Brasília, DF, Brazil;5. Max Planck Institute for Chemistry, Climate Geochemistry Department, Hahn-Meitner-Weg 1, 55128 Mainz, Germany;6. China University of Geosciences, State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, Wuhan, PR China |
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| Abstract: | The topographic evolution of a mountain system provides key information for understanding surface processes. We present a new and relatively simple method to reconstruct two-dimensional paleotopography composed of two steps: (1) construction of thermal history using low-temperature thermochronological data and (2) conversion of the thermal history into topographic evolution. A new computer program “Low-T Topo” was developed to perform the suggested conversion of thermal history to paleotopography. This approach, when applied to the coastal mountain system (CMS) in Southeastern China, suggests an uneven topographic evolution along the Changting-Zhangzhou section since the Late Cretaceous. According to our modeling, the SE segment of the section was higher (maximum peak elevation = ~3.8 km) than the NW segment (~3.4 km) during ~80–50 Ma. The modeling also suggests that both the SE and NW segments experienced an initially higher exhumation rate of ~0.14 km/Myr at 80–70 Ma, which steadily decreased to about 0.03 km/Myr at 40 Ma. Since then, exhumation rates stayed relatively low (≤~0.05 km/Myr). The elevation reduction in the CMS since the Late Cretaceous played an important role introducing the warm and humid Pacific air to the inland. |
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