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<title lang=en>The South Tibet detachment shear zone in the Dinggye area Time constraints on extrusion models of the Himalayas</title>
<creator>Leloup, P. H.</creator>
<creator>Maheo, G.</creator>
<creator>Arnaud, Nicolas</creator>
<creator>Kali, E.</creator>
<creator>Boutonnet, E.</creator>
<creator>Liu, Dunyi</creator>
<creator>Liu Xiaohan, </creator>
<creator>Li Haibing, </creator>
<contributor>Laboratoire de Sciences de la Terre (LST) ; École normale supérieure - Lyon (ENS Lyon) - Université Claude Bernard Lyon 1 (UCBL) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>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)</contributor>
<contributor>Institut de physique du globe de Strasbourg (IPGS) ; Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of Geology, CAGS, Beijing ; Université du Québec</contributor>
<contributor>Chinese Academy of Sciences [Beijing] (CAS)</contributor>
<description>International audience</description>
<source>ISSN: 0012-821X</source>
<source>Earth and Planetary Science Letters</source>
<publisher>Elsevier</publisher>
<identifier>hal-00475652</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00475652</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00475652</source>
<source>Earth and Planetary Science Letters, Elsevier, 2010, 292 (1-2), pp.1-16. 〈10.1016/j.epsl.2009.12.035〉</source>
<identifier>DOI : 10.1016/j.epsl.2009.12.035</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2009.12.035</relation>
<language>en</language>
<subject lang=en>Himalaya</subject>
<subject lang=en>South Tibet Detachment System</subject>
<subject lang=en>chronology</subject>
<subject lang=en>extrusion</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>We investigate the timing of end of motion along the South Tibet Detachment System (STDS), a major normal fault system that runs parallel to the Himalayan range for more than 1500 km. Near Dinggye (similar to 28 degrees 10'N, 87 degrees 40'E), the STD dips similar to 10 +/- 5 degrees to the North and separates Paleozoic Tethyan series from Upper Himalayan Crystalline Series (UHCS). Immediately below the STD, the UHCS is highly deformed in the STD shear zone, lineations trend NNE and the shear senses are top to the NE. In micaschist, the P-T path constrained by pseudosection and garnet chemistry, shows successive metamorphic conditions of similar to 0.6 GPa and similar to 550 degrees C and 0.5 GPa and 625 degrees C. U/Pb dating of monazites and zircons in deformed and undeformed leucogranites suggests that ductile deformation lasted until at least similar to 16 Ma but ended prior to similar to 15 Ma in the STD shear zone similar to 100 m below the detachment. Ar/Ar micas ages in the footwall span between similar to 14.6 and 13.6 Ma, indicating rapid cooling down to similar to 320 degrees C, and suggesting persistence of normal faulting, at that time. The STDS is cut and offset by the N-S trending Dinggye active normal fault which initiated prior to 11 Ma thus providing a minimum bound for the end of STDS motion. These data are interpreted as reflecting 0.3 GPa (11 km) to 0.6 GPa (22 km) of exhumation along the STDS starting prior to similar to 16 Ma, ending between 13.6 and 11 Ma. The 1000 km long stretch of the STDS east of the Gurla Mandata probably stopped almost synchronously between 13 and 11 Ma ago, coevally with a sudden switch from NNE-SSW to E-W extension at the top of the accretionary prism, with a jump of the major thrust from the lower Main Central Thrust (MCTI) to the Main Boundary Thrust (MBT), and with a change in the India and Asia convergence direction. This synchronism is probably better explained in the frame of a thrust wedge or thrust system model than a lower channel flow model. West of the Gurla Mandata the STDS appears to stop 5 to 3 Ma earlier, possibly related to local interactions with the Karakorum fault in a way that needs to be understood.</description>
<date>2010</date>
</dc>
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