Long-lasting intracontinental strike-slip faulting: new evidence from the Karakorum shear zone in the Himalayas
Abstract:
Zircon
crystallization ages for a syntectonic granite and an associated dyke
along the Tangtse strand of the Karakorum fault are 18.5 ± 0.2 and 18.6
± 0.2 Ma, respectively. A dyke cross-cutting the foliation in the
Karakorum shear zone (Ksz) yielded an age of 16.0 ± 0.6 Ma. These data
show that the Ksz was associated with significant granitic magmatism
and was active before 16 Ma, since at least c. 18.5 Ma. Consideration
of other data along the Karakorum fault suggests that the fault has
most likely been active since c. 22.7–25 Ma at a rate of 8–13 mm a-1.
This study conducted in the frontal part of the Himalayan orogen shows
that large continental strike-slip faults can be linked with magmatism
and be stable for more than 20 Ma, even in the hottest part of the
orogen where strain localization is supposed to be at a minimum.
Citation: Leloup, P.H., E., Boutonnet, W.J., Davis and K. Hattori; Long-lasting intracontinental strike-slip faulting: new evidence from the Karakorum shear zone in the Himalayas; Terra Nova, 23, 92–99,2011, doi: 10.1111/j.1365-3121.2011.00988.x
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