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<title lang=en>Direct dating of mid-crustal shear zones with synkinematic allanite: new in situ U-Th-Pb geochronological approaches applied to the Mont Blanc massif</title>
<creator>Cenki-Tok, Bénédicte</creator>
<creator>Darling, James R.</creator>
<creator>Rolland, Yann</creator>
<creator>Dhuime, Bruno</creator>
<creator>Storey, Craig D.</creator>
<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>Department of Earth Sciences, University of Western Ontario, London ; Université du Québec</contributor>
<contributor>Géoazur (GEOAZUR) ; Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de la Côte d'Azur - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Department of Earth Sciences, University of Bristol ; Université du Québec</contributor>
<contributor>School of Earth and Environmental Sciences, University of Portsmouth ; Université du Québec</contributor>
<description>International audience</description>
<source>ISSN: 0954-4879</source>
<source>EISSN: 1365-3121</source>
<source>Terra Nova</source>
<publisher>Wiley-Blackwell</publisher>
<identifier>hal-00963545</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00963545</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00963545</source>
<source>Terra Nova, Wiley-Blackwell, 2014, 26 (1), pp.29-37. 〈10.1111/ter.12066〉</source>
<identifier>DOI : 10.1111/ter.12066</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1111/ter.12066</relation>
<language>en</language>
<subject lang=sq>shear zones</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Dating the timing of motion on crustal shear zones is of tremendous importance for understanding the assembly of orogenic terranes. This objective is achieved in this paper by combining petrological and structural observations with novel developments in in situ U-Th-Pb geochronology of allanite. A greenschist facies shear zone within the Mont Blanc Massif is documented. Allanite is synkinematic and belongs to the mylonitic assemblage. LA-ICP-MS U-Th-Pb isotope analyses of allanite reveal high contents and highly radiogenic isotopic compositions of the common-Pb component. The use of measured Pb-isotope compositions of associated minerals (feldspars and chlorite) is critical for accurate common-Pb correction, and provides a powerful mechanism for linking allanite growth to the metamorphic assemblage. A mean 208Pb/232Th age of 29.44 ± 0.95 Ma is accordingly taken for synkinematic allanite crystallisation under greenschist facies conditions. This age reflects the timing of the Mont Blanc underthrusting below the Penninic Front and highlights the potential of directly dating deformation with allanite.</description>
<date>2014-02</date>
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