Инд. авторы:	D'Eyrames E., Thomassot E., Kitayama Y., Golovin A.V., Korsakov A.V., Ionov D.
Заглавие:	A mantle origin for sulfates in the unusual 'salty' Udachnaya-East kimberlite from sulfur abundances, speciation and their relationship with groundmass carbonates
Библ. ссылка:	D'Eyrames E., Thomassot E., Kitayama Y., Golovin A.V., Korsakov A.V., Ionov D. A mantle origin for sulfates in the unusual 'salty' Udachnaya-East kimberlite from sulfur abundances, speciation and their relationship with groundmass carbonates // Bulletin de la Societe Geologique de France. - 2017. - Vol.188. - Iss. 1-2. - ISSN 0037-9409.
Внешние системы:	DOI: 10.1051/bsgf/2017007; РИНЦ: 31117244; SCOPUS: 2-s2.0-85026663687; WoS: 000406259700007;
Реферат:	eng: 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-1 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. © SGF, Published by EDP Sciences 2017.
Ключевые слова:	Siberia; Sakha; Russian Federation; sulfur; sulfide; sulfate; speciation (chemistry); mantle source; magmatism; kimberlite; carbonate rock; breccia; Udachnaya; Sulfides; Sulfates; Siberia; Mantle; Kimberlite; Udachnaya Pipe;
Издано:	2017