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Medientyp:
E-Artikel
Titel:
Fluvial terrace riser degradation and determination of slip rates on strike‐slip faults: An example from the Kunlun fault, China
Beteiligte:
Harkins, Nathan;
Kirby, Eric
Erschienen:
American Geophysical Union (AGU), 2008
Erschienen in:Geophysical Research Letters
Sprache:
Englisch
DOI:
10.1029/2007gl033073
ISSN:
0094-8276;
1944-8007
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>The use of displaced fluvial terrace risers to determine slip rates along strike‐slip faults depends on knowing when risers become passive markers. Typically, chronologic constraints from terrace deposits only place bounds on this age; consequent slip rates may be highly uncertain. Along the Kunlun fault, in northeastern Tibet, we demonstrate that consideration of riser degradation can augment terrace chronology and improve the precision of slip‐rate estimates. Multiple offset risers and <jats:sup>14</jats:sup>C age determinations from terrace treads yield a narrow range of slip rates of 4.5 ± 0.5 m/kyr at one site, but permit a wide range of allowable rates (3–10 m/kyr) in an adjacent drainage. Using a locally calibrated sediment transport rate of 3.2–5.4 m<jats:sup>2</jats:sup>/ka, we show that riser morphology at this latter site is consistent with degradation since abandonment of the upper terrace tread. Our analysis indicates that slip rates at this site are ∼5 ± 2 m/kyr.</jats:p>