Low Quaternary slip rate reconciles geodetic and geologic rates along the Altyn Tagh fault, northwestern Tibet
- 1Department of Geology, University of California–Davis, Davis, California 95616, USA
- 2Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
- 3School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA
- 4Earth Systems Science Department, University of California–Irvine, Irvine, California 92697, USA
Abstract
For more than two decades the slip rate along the active, left-slip Altyn Tagh fault of northwestern Tibet has been disputed, with millennial rates reported to be as much as three times faster than those determined geodetically. This problem is significant because the total offset, plate-boundary length, and age of the Altyn Tagh fault make it the most important single structure accommodating India-Asia convergence north of the Himalayas. Here we show that the central Altyn Tagh fault slipped at only 14–9 mm/a over the past 4–6 ka by tightly bracketing the age of a displaced fluvial terrace riser at Yuemake (88.51°E, 38.19°N). This result contradicts previous latest Quaternary rates and is consistent with those derived from geodetic, paleoseismic, and geologic measurements, and thus resolves the long-standing dispute over the latest Quaternary slip rate along the longest active strike-slip fault in Tibet.
Footnotes
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↵GSA Data Repository item 2009150, analytical details and supplementary observations and discussion, is available online at www.geosociety.org/pubs/ft2009.htm, or on request from editing{at}geosociety.org or Documents Secretary, GSA, P.O. Box 9140, Boulder, CO 80301, USA.
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- Received 28 October 2008.
- Revision received 10 February 2009.
- Accepted 5 March 2009.
- © 2009 Geological Society of America
