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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Kyanite-bearing eclogite xenoliths from the Udachnaya kimberlite, Siberian craton, Russia</title>
<creator>Radu, Ioana-bogdana</creator>
<creator>Moine, Bertrand</creator>
<creator>IONOV, Dmitri</creator>
<creator>Korsakov, Andrey</creator>
<creator>Golovin, Alexander</creator>
<creator>Mikhailenko, Denis</creator>
<creator>Cottin, Jean-Yves</creator>
<contributor>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)</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>Novosibirsk State University</contributor>
<source>ISSN: 0037-9409</source>
<source>SGF Bulletin</source>
<publisher>Société Géologique de France</publisher>
<identifier>hal-01622617</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01622617</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01622617</source>
<source>SGF Bulletin, Société Géologique de France, 2017, 188 (1-2), pp.UNSP 7. 〈10.1051/bsgf/2017008〉</source>
<identifier>DOI : 10.1051/bsgf/2017008</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1051/bsgf/2017008</relation>
<language>en</language>
<subject lang=en>Siberia</subject>
<subject lang=en>Eclogite</subject>
<subject lang=en>Xenolith</subject>
<subject lang=en>Kyanite</subject>
<subject lang=en>Mantle</subject>
<subject lang=en>Craton</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Xenoliths brought up by kimberlite magmas are rare samples of otherwise inaccessible lithospheric mantle. Eclogite xenoliths are found in most cratons and commonly show a range of mineral and chemical compositions that can be used to better understand craton formation. This study focuses on five new kyanite-bearing eclogites from the Udachnaya kimberlite pipe (367±5 Ma). They are fine-to coarse-grained and consist mainly of “cloudy” clinopyroxene (cpx) and garnet (grt). The clinopyroxene is Al,Na-rich omphacite while the garnet is Ca-rich, by contrast to typical bi-mineral (cpx+grt) eclogites that contain Fe- and Mg-rich garnets. The Udachnaya kyanite eclogites are similar in modal and major element composition to those from other cratons (Dharwar, Kaapvaal, Slave, West African). The kyanite eclogites have lower REE concentrations than bi-mineral eclogites and typically contain omphacites with positive Eu and Sr anomalies, i.e. a “ghost plagioclase signature”. Because such a signature can only be preserved in nonmetasomatised samples, we infer that they were present in the protoliths of the eclogites. It follows that subducted oceanic crust is present at the base of the Siberian craton. Similar compositions and textures are also seen in kyanite eclogites from other cratons, which we view as evidence for an Archean, subduction-like formation mechanism related to craton accretion. Thus, contrary to previous work that classifies all kyanite eclogites as type I (IK), metasomatized by carbonatite/kimberlitic fluids, we argue that some of them, both from this work and those from other cratons, belong to the non-metasomatized type II (IIB). The pristine type IIB is the nearest in composition to protoliths of mantle eclogites because it contains no metasomatic enrichments.</description>
<date>2017</date>
</dc>
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