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<title lang=en>Synkinematic magmatism, heterogeneous deformation, and progressive strain localization in a strike-slip shear zone: The case of the right-lateral Karakorum fault</title>
<creator>Boutonnet, Emmanuelle</creator>
<creator>Leloup, P. H.</creator>
<creator>Arnaud, Nicolas</creator>
<creator>Paquette, Jean-Louis</creator>
<creator>Davis, W. J.</creator>
<creator>Hattori, K.</creator>
<contributor>Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE) ; Centre National de la Recherche Scientifique (CNRS) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Claude Bernard Lyon 1 (UCBL) - École normale supérieure - Lyon (ENS Lyon)</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Magmas et Volcans (LMV-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] - Institut Mines-Télécom [Paris] - SPIN - Centre National de la Recherche Scientifique (CNRS) - Laboratoire Magmas et Volcans (LMV) ; Université Jean Monnet [Saint-Étienne] (UJM) - Institut de Recherche pour le Développement et la société - Université Clermont Auvergne (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - Institut de Recherche pour le Développement et la société - Université Clermont Auvergne (UCA)</contributor>
<contributor>Geological Survey of Canada, Ottawa ; Université du Québec</contributor>
<contributor>University of Ottawa [Ottawa]</contributor>
<description>International audience</description>
<source>ISSN: 0278-7407</source>
<source>Tectonics</source>
<publisher>American Geophysical Union (AGU)</publisher>
<identifier>hal-00745066</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00745066</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00745066</source>
<source>Tectonics, American Geophysical Union (AGU), 2012, 31, pp.TC4012. 〈10.1029/2011TC003049〉</source>
<identifier>DOI : 10.1029/2011TC003049</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1029/2011TC003049</relation>
<language>en</language>
<subject lang=en>Karakorum</subject>
<subject lang=en>geochronology</subject>
<subject lang=en>localization</subject>
<subject lang=en>strike slip fault</subject>
<subject lang=en>tectonics</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>New structural observations coupled with 15 U/Pb and 24 Ar/Ar new ages from the Karakorum shear zone (KSZ) constrain the timing and slip rate of the right-lateral Karakorum fault zone (KFZ), one of the great continental Asian strike-slip faults. In the Tangtse-Darbuk area, the Tangtse (SW) and Muglib (NE) mylonitic strands of the KSZ frame the less deformed Pangong Range. Inherited U/Pb ages show that granitic protoliths are mostly from the Karakorum and Ladakh batoliths, with a major Miocene melting event lasting from ≥21.5 to 13.5 Ma. Some of the Miocene granitic bodies show structural evidence for intrusion synkinematic to the KSZ. The oldest of these granitoids is 18.8 ± 0.4 Ma old, implying that deformation started prior to ∼19 Ma. Microstructural data show that right-lateral deformation pursued during cooling. Ar/Ar data show that ductile deformation stopped earlier in the Tangtse (∼11 Ma) than in the Muglib strand (∼7 Ma). Deformation ended at ∼11 Ma in the Tangtse strand while it is still active in the Muglib strand, suggesting a progressive localization of deformation. When merged with published observations along the KFZ, these data suggest that the KFZ nucleated in the North Ayilari range at least ∼22 Ma ago. The long-term fault rate is 0.84 to 1.3 cm/yr, considering a total offset of 200 to 240 km. The KSZ collected magma produced within the shear zone and/or deeper in crust for which the producing mechanism stays unclear but was not the lower crustal channel flow.</description>
<date>2012-08-02</date>
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