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<datestamp>2018-01-11</datestamp>
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<title lang=en>A mantle origin for sulfates in the unusual "salty" Udachnaya-East kimberlite from sulfur abundances, speciation and their relationship with groundmass carbonates</title>
<creator>D'eyrames, Elisabeth</creator>
<creator>Thomassot, Emilie</creator>
<creator>Kitayama, Yumi</creator>
<creator>Golovin, Alexander</creator>
<creator>Korsakov, Andrey</creator>
<creator>IONOV, Dmitri</creator>
<contributor>Centre de Recherches Pétrographiques et Géochimiques (CRPG) ; Université de Lorraine (UL) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Novosibirsk State University</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>
<source>ISSN: 0037-9409</source>
<source>SGF Bulletin</source>
<publisher>Société Géologique de France</publisher>
<identifier>hal-01622633</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01622633</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01622633</source>
<source>SGF Bulletin, Société Géologique de France, 2017, 188 (1-2), pp.UNSP 6. 〈10.1051/bsgf/2017007〉</source>
<identifier>DOI : 10.1051/bsgf/2017007</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1051/bsgf/2017007</relation>
<language>en</language>
<subject lang=en>Kimberlite</subject>
<subject lang=en>Udachnaya</subject>
<subject lang=en>Siberia</subject>
<subject lang=en>Mantle</subject>
<subject lang=en>Sulfates</subject>
<subject lang=en>Sulfides</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</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>The Udachnaya-East pipe in Yakutia in Siberia hosts a unique dry (serpentine-free) body of hypabyssal kimberlite (<0.64wt% H2O), associated with a less dry type of kimberlite and a serpentinized kimberlitic breccia. The dry kimberlite is anomalously rich in salts (Na2O and Cl both up to 6wt%) whereas the slightly less dry and the breccia kimberlite are salt free. Yet the Udachnaya kimberlite is a group-I kimberlite, as is the archetypical kimberlite from Kimberley, South Africa. Samples were studied from the three different types of kimberlite (dry-salty, n=8, non-salty, n=5 and breccia, n=3) regarding their mineralogy, geochemistry, and more specifically their sulfur content. Our results show the salty kimberlite is unprecedentedly rich in sulfur (0.13-0.57wt%) compared to the non-salty kimberlite (0.04-0.12wt%) and the breccia (0.29-0.33wt%). In the salty kimberlite, most of the sulfur is present as sulfates (up to 97% of Stotal) and is disseminated throughout the groundmass in close association with Na-K-bearing carbonates. Sulfates occur within the crystal structure of these Na-K-bearing carbonates as the replacement of (CO3) by (SO3) groups, or as Na- and K-rich sulfates (e.g. aphtitalite, (K,Na)3Na(SO4)2). The associated sulfides are djerfisherite; also Na- and K-rich species. The close association of sulfates and carbonates in these S-rich alkaline rocks suggests that the sulfates crystallized from a mantle-derived magma, a case that has strong implication for the oxygen fugacity of kimberlite magmatism and more generally for the global S budget of the mantle.</description>
<date>2017</date>
</dc>
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