6533b82efe1ef96bd129287e
RESEARCH PRODUCT
Comment on "Displacement along the Karakoram fault, NW Himalaya, estimated from LA-ICP-MS U Pb dating of offset geologic markers" published by Shifeng Wang et al. in EPSL, 2012
Marie-luce ChevalierPhilippe Hervé LeloupBarun K. MukherjeeRoberto F. WeinbergNicolas ArnaudJean-louis PaquetteEmmanuelle BoutonnetEmmanuelle BoutonnetFranck ValliHongbo LiPaul TapponnierRobin Lacassinsubject
Offset (computer science)010504 meteorology & atmospheric sciencesGeochemistry[SDU.STU]Sciences of the Universe [physics]/Earth SciencesKarakorum strike-slip faultdating deformationsynkinematic meltingengineering.materialFault (geology)010502 geochemistry & geophysics01 natural sciencesDisplacement (vector)offsetGeochemistry and PetrologyLa icp msEarth and Planetary Sciences (miscellaneous)Geomorphology0105 earth and related environmental sciencesgeographygeography.geographical_feature_categoryMuscoviterateGeophysicsSinistral and dextralSpace and Planetary ScienceengineeringGeologydescription
International audience; Field evidence for syn-deformation migmatization and crystallization along the Karakorum fault contradicts the study of Wang et al. (2012). The ages of such magmatic rocks provide minimum ages for the onset of deformation at similar to 23 Ma in North Ayilari and similar to 19 Ma in Tangtse. The onset of deformation at 12 Ma in the Ayilari range inferred by Wang et al. (2012) from a muscovite Ar/Ar age is a cooling age, thus only a minimum age. The similar to 60 Ma granodiorite bodies, the ophiolitic rocks and the south Kailash thrust that are correlated across the fault to provide a 52 +/- 2 km finite offset do not define reliable piercing points. Such observations as well as our previous work concur to show that the Karakorum fault initiated in the Oligo-Miocene, and has a long-term dextral slip-rate between 7.5 and 13 mm/yr, approximately twice that proposed by Wang et al. (2012).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-02-01 |