40Ar/39Ar dating constraints on the high-angle normal faulting along the southern segment of the Tan-Lu fault system: An implication for the onset of eastern China rift-systems |
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| Authors: | Yu Wang Su Zhou |
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| Institution: | 1. Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany;2. Universidade Guarulhos, CEPPE, Centro do Pós-Graduação, Pequisa e Extensão, Praça Tereza Cristina, 229, Centro, 07011-040, Guarulhos, SP, Brazil;3. Department of Geological Sciences, Jackson School of Geosciences, The University of Texas, 2275 Speedway Stop C9000, Austin, TX 78712-1722, United States;4. Departamento de Petrologia e Metalogenia, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista, Av. 24-A, 1515, Bela Vista, 13506-900 Rio Claro, SP, Brazil;1. Department of Geology and Geography, Auburn University, Auburn, AL 36849, USA;2. Institute of Geology, China Earthquake Administration, Beijing 100029, China;3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4. Department of Earth and Space Sciences, UCLA, Los Angeles, CA 90095, USA |
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| Abstract: | High-angle normal faulting in eastern China was an important tectonic process responsible for the rifting of the eastern Asian continental margin. Along the southern segment of the Tan-Lu fault system, part of the eastern China rift-system, 55–70° east-dipping normal faults are the oldest structures within this rift-system. Chlorite, pseudotachylite, and fault breccia are found in fault zones, which are characterized by microstructures and syn-deformation chlorite minerals aligned parallel to a down-dip stretching lineation. 40Ar/39Ar dating of syn-deformation chlorite and K-feldspar from the fault gouge zone yields cooling ages of ～75–70 Ma, interpreted as the timing of slip along the normal faults. This age is older than that of opening of the Japanese sea and back-arc extension in the west Pacific, but similar to the onset of the Indo-Asian (soft?) collision. |
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