Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 34, Issue 1, Pages 51-60Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2008.04.003
Keywords
Eastern China; Rift-systems; Chlorite and K-feldspar; 40Ar/39Ar dating
Categories
Funding
- Program for New Century Excellent Talents in University [NCET-2005]
- Open Research Program from State Key Laboratories of GPMR [0536]
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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 degrees 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 similar to 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. (C) 2008 Elsevier Ltd. All rights reserved.
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