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Ankaramite: a new type of high-magnesium and high-calcium primitive melt in the Magnitogorsk Island-arc zone (Southern Urals)

Pushkarev, EV, Ryazancev, AV, Gottman, IA, Degtyarev, KE and Kamenetsky, VS ORCID: 0000-0002-2734-8790 2018 , 'Ankaramite: a new type of high-magnesium and high-calcium primitive melt in the Magnitogorsk Island-arc zone (Southern Urals)' , Doklady Earth Sciences, vol. 479, no. 2 , pp. 463-467 , doi: 10.1134/S1028334X18040062.

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This work describes the geological position, mineral and chemical composition of high-Mg effusive ankaramites occurring as dykes and lava flows. They were found in the mélange zone of the western margin of the Magnitogorsk island arc zone in the Southern Urals. Data on the liquidus association of phenocrysts and on the composition of the matrix of effusives are given. According to the data obtained, the conclusion was drawn that the ankaramites studied can be attributed to the primary island arc melts, which were not subject to essential differentiation. This type of effusives has not been distinguished previously among island arc volcanogenic formations of the Urals. It is shown that ankaramites can be considered to be primary melts parental for dunite–clinopyroxenites–gabbro complexes of Ural–Alaskan type. The occurrence of ankaramites in the Paleozoic island arc formations of the Urals indicates the wehrlite composition of the mantle as the reason for the extremely wide development of wehrlites and clinopyroxenites in different mafic–ultramafic complexes of the Urals.

Item Type: Article
Authors/Creators:Pushkarev, EV and Ryazancev, AV and Gottman, IA and Degtyarev, KE and Kamenetsky, VS
Keywords: island arc, ankaramite, mantle, geochemistry, mineralogy
Journal or Publication Title: Doklady Earth Sciences
Publisher: Interperiodica
ISSN: 1028-334X
DOI / ID Number: 10.1134/S1028334X18040062
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© Pleiades Publishing, Ltd., 2018.

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