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New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault

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New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault

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dc.contributor.author Valli, Franck
dc.contributor.author Leloup, Philippe Hervé
dc.contributor.author Paquette, Jean-Louis
dc.contributor.author Arnaud, Nicolas
dc.contributor.author Li, Haibing
dc.contributor.author Tapponnier, Paul
dc.contributor.author Lacassin, Robin
dc.contributor.author Guillot, Stéphane
dc.contributor.author Liu, Dunyi
dc.contributor.author Deloule, Etienne
dc.contributor.author Xu, Zhiqin
dc.contributor.author Mahéo, Gweltaz.
dc.date.accessioned 2012-10-09T03:45:46Z
dc.date.available 2012-10-09T03:45:46Z
dc.date.copyright 2008
dc.date.issued 2012-10-09
dc.identifier.citation Valli, F., Leloup, P. H., Paquette, J. L., Arnaud, N., Li, H., Tapponnier, P., et al. (2008). New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault. Tectonics, 27(5).
dc.identifier.issn 0278-7407
dc.identifier.uri http://hdl.handle.net/10220/8731
dc.description.abstract Zircons and monazites from 6 samples of the North Ayilari dextral shear zone (NAsz), part of the Karakorum fault zone (KFZ), have been dated with the U-Th-Pb method, using both ID-TIMS and SIMS techniques. The ages reveal (1) inheritance from several events spanning a long period between the late Archean and the Jurassic; (2) an Eocene- Oligocene magmatic event ( ~35–32 Ma); (3) an Oligo-Miocene magmatic event ( ~25–22 Ma), at least partly synkinematic to the right-lateral deformation; and (4) a period of metamorphism metasomatism ( ~22–14 Ma) interpreted as thermal and fluid advection in the shear zone. The Labhar Kangri granite located ~375 km farther Southeast along the KFZ is dated at 21.1 ± 0.3 Ma. Such occurrence of several Oligo-Miocene granites along the KFZ, some of which show evidence for synkinematic emplacement, suggests that the fault zone played an important role in the genesis and /or collection of crustal melts. We discuss several scenarios for the onset and propagation of the KFZ, and offset estimates based on the main sutures zones. Our preferred scenario is an Oligo-Miocene initiation of the fault close to the NA range, and propagation along most of its length prior to ~19 Ma. In its southern half, the averaged long-term fault-rate of the KFZ is greater than 8 to 10 mm/a, in good agreement with some shorter-term estimates based on the Indus river course, or Quaternary moraines and geodesy. Our results show the KFZ cannot be considered as a small transient fault but played a major role in the collision history.
dc.language.iso en
dc.relation.ispartofseries Tectonics
dc.rights © 2008 the American Geophysical Union. This paper was published in Tectonics and is made available as an electronic reprint (preprint) with permission of the American Geophysical Union. The paper can be found at the following official DOI: http://dx.doi.org/10.1029/2007TC002184 .  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
dc.subject DRNTU::Science::Geology.
dc.title New U-Th/Pb constraints on timing of shearing and long-term slip-rate on the Karakorum fault
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1029/2007TC002184
dc.description.version Published version

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