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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Metamorphic P–T–t–d evolution of (U)HP metabasites from the South Tianshan accretionary complex (NW China) — Implications for rock deformation during exhumation in a subduction channel</title>
<creator>Soldner, Jérémie</creator>
<creator>Oliot, Emilien</creator>
<creator>Schulmann, Karel</creator>
<creator>Štípská, Pavla</creator>
<creator>Kusbach, Vladimír</creator>
<creator>Anczkiewicz, Robert</creator>
<contributor>Czech Geological Survey, Prague</contributor>
<contributor>Dylbas ; Institut de physique du globe de Strasbourg (IPGS) ; Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - 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>Polish Academy of Sciences, Kraków Research Centre, Senacka ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 1342-937X</source>
<source>Gondwana Research</source>
<publisher>Elsevier</publisher>
<identifier>hal-01481263</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01481263</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01481263</source>
<source>Gondwana Research, Elsevier, 2016, 〈10.1016/j.gr.2016.07.007〉</source>
<identifier>DOI : 10.1016/j.gr.2016.07.007</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2016.07.007</relation>
<language>en</language>
<subject lang=en> Eclogite</subject>
<subject lang=en> Tianshan massif</subject>
<subject lang=en> (U)HP metamorphic belt</subject>
<subject lang=en> Electron backscatter diffraction</subject>
<subject lang=en> Thermodynamic modelling</subject>
<subject lang=en> Garnet geochronology</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<subject>[SDU.STU.MI] Sciences of the Universe [physics]/Earth Sciences/Mineralogy</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The late Carboniferous accretionary system of the South Tianshan orogen (North-Western China) underwent complex structural and polymetamorphic evolution. Combined petrological, geochronological and microstructural analysis of (ultra)high-pressure (UHP) metabasites (eclogites and blueschists) enclosed in metapelites show a relict coarse-grained eclogitic fabric S2 surrounded by a dominant fine-grained eclogite and blueschist facies retrograde fabric S2. The S2 fabric is reworked by upright folds F3 that are responsible for a major shortening of the whole accretionary system. For both the eclogite and blueschist, peak and retrograde P–T conditions have been thermodynamically constrained at 25–26 kbar and 425–500 °C and 10–13 kbar and 500−550 °C respectively, suggesting a shared exhumation history. The garnet-whole rock-amphibole isochron in the blueschist yielded Lu–Hf and Sm–Nd ages of 326.0 ± 2.9 Ma and 318.4 ± 3.9 Ma respectively, interpreted to date the prograde to peak metamorphic assemblage. The retrograde path of the eclogite is characterized by heterogeneous omphacite recrystallization into a mylonitic fine-grained matrix and crystallization of blue amphibole. Microstructures in both pristine porphyroclastic and recrystallized fine-grained domains in the eclogite indicate a gradual evolution from constriction-dominated (L>S-type) to flattening-dominated (S>L-type) type of deformation, increase of fabric intensity reflected by gradually growing M-indexes and the development of lattice preferred orientation (LPO) typical for dislocation creep under slightly hydrated conditions. Recrystallization of the matrix in the blueschist is homogeneous, which indicates a matrix dominated channel flow during exhumation. These LPOs evolutions suggest a significant mechanical coupling with the upper plate concomitant with oroclinal bending of the Kazakh orocline. Lock up of Kazakh orocline is responsible for further stress increase resulting in horizontal shortening of South Tianshan accretionary wedge and development of D3 upright folding and steepening of the whole sequence.</description>
<date>2016-09-07</date>
</dc>
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