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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

Citation

Sharygin, VV and Kamenetsky, VS and Zhitova, LM and Belousov, AB and Abersteiner, A, Copper-containing magnesioferrite in vesicular trachyandesite in a lava tube from the 2012-2013 eruption of the Tolbachik Volcano, Kamchatka, Russia, Minerals, 8, (11) Article 514. ISSN 2075-163X (2018) [Refereed Article]


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

DOI: doi:10.3390/min8110514

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 ΅m) 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 Details

Item Type:Refereed Article
Keywords:magnesioferrite, cuprospinel, hematite, tenorite, trachyandesite, lava tube, Tolbachik
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and Crystallography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
Author:Abersteiner, A (Mr Adam Abersteiner)
ID Code:129123
Year Published:2018
Deposited By:CODES ARC
Deposited On:2018-11-10
Last Modified:2018-12-06
Downloads:0

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