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 , V V , Kamenetsky , V S , Zhitova , L M , Belousov , A B & 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 , 514 . https://doi.org/10.3390/min8110514

Title: Copper-Containing Magnesioferrite in Vesicular Trachyandesite in a Lava Tube from the 2012-2013 Eruption of the Tolbachik Volcano, Kamchatka, Russia
Author: Sharygin, Victor V.; Kamenetsky, Vadim S.; Zhitova, Liudmila M.; Belousov, Alexander B.; Abersteiner, Adam
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2018-11
Language: eng
Number of pages: 22
Belongs to series: Minerals
ISSN: 2075-163X
URI: http://hdl.handle.net/10138/326102
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 degrees C) reactionary zones (up to 100 mu 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) (Fe1.943+Al0.03Ti0.02)O-4. Increasing CuO content of the Duplex Cu-rich magnesioferrite is reflected in Raman spectra by moderate right shifting bands at approximate to 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.
Subject: magnesioferrite
cuprospinel
hematite
tenorite
trachyandesite
lava tube
Tolbachik volcano
Kamchatka
FISSURE ERUPTION
MAGNETIC-PROPERTIES
PHASE-TRANSITION
MINERALS
CUFE2O4
CUPROSPINEL
PRECURSORS
FUMAROLES
BEHAVIOR
GOLD
1171 Geosciences
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