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

Citation

Pushkarev, EV and Ryazancev, AV and Gottman, IA and Degtyarev, KE and Kamenetsky, VS, Ankaramite: a new type of high-magnesium and high-calcium primitive melt in the Magnitogorsk Island-arc zone (Southern Urals), Doklady Earth Sciences, 479, (2) pp. 463-467. ISSN 1028-334X (2018) [Refereed Article]

Copyright Statement

© Pleiades Publishing, Ltd., 2018.

DOI: doi:10.1134/S1028334X18040062

Abstract

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 Details

Item Type:Refereed Article
Keywords:island arc, ankaramite, mantle, geochemistry, mineralogy
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:126048
Year Published:2018
Funding Support:Australian Research Council (DP130100257)
Deposited By:CODES ARC
Deposited On:2018-05-20
Last Modified:2019-03-08
Downloads:0

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