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Copper-containing magnesioferrite in vesicular trachyandesite in a lava tube from the 2012–2013 eruption of the Tolbachik Volcano, Kamchatka, Russia

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Sharygin, VV, Kamenetsky, VS ORCID: 0000-0002-2734-8790, Zhitova, LM, Belousov, AB and Abersteiner, A 2018 , 'Copper-containing magnesioferrite in vesicular trachyandesite in a lava tube from the 2012–2013 eruption of the Tolbachik Volcano, Kamchatka, Russia' , Minerals, vol. 8, no. 11 , pp. 1-22 , doi: 10.3390/min8110514.

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Abstract

Cu-rich magnesioferrite was found in vesicular basaltic trachyandesite in one of lava tubes (Duplex) that formed during the 2012–2013 eruption of the Tolbachik volcano, Kamchatka. This mineral is commonly associated with hematite, tenorite, halite, sylvite, and Ca-rich silicates (mainly, esseneite and Na-rich melilite) in high-temperature (800–1000 °C) reactionary zones (up to 100 µm) covering vesicular rocks and lava stalactites in the Duplex tube. The mineral relationships of this assemblage indicate the following crystallization sequence: Ca-rich silicates + hematite → Cu-rich magnesioferrite → tenorite → chlorides. This formed due to the reaction of hot gases containing Cu, alkalis, and Cl with solidified lava rock. The composition of magnesioferrite varies strongly in CuO (5.8–17.3 wt %; cuprospinel end-member—15–47 mol %), whereas the contents of other oxides are minor, indicating the main isomorphic substitution is Mg2+ ↔ Cu2+. Compositions with maximal CuO content nominally belong to Mg-rich cuprospinel: (Cu0.48Mg0.41Mn0.09Zn0.02Ca0.02) (Fe3+1.94Al0.03Ti0.02)O4. Increasing CuO content of the Duplex Cu-rich magnesioferrite is reflected in Raman spectra by moderate right shifting bands at ≈700–710 and 200–210 cm−1 and the appearance of an additional band at 596 cm−1. This supports the main isomorphic scheme and may indicate a degree of inversion in the spinel structure.

Item Type: Article
Authors/Creators:Sharygin, VV and Kamenetsky, VS and Zhitova, LM and Belousov, AB and Abersteiner, A
Keywords: magnesioferrite, cuprospinel, hematite, tenorite, trachyandesite, lava tube, Tolbachik
Journal or Publication Title: Minerals
Publisher: MDPIAG
ISSN: 2075-163X
DOI / ID Number: 10.3390/min8110514
Copyright Information:

Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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