Copper-containing magnesioferrite in vesicular trachyandesite from Tolbachik Volcano, Kamchatka, Russia

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Marco E. Ciriotti
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Copper-containing magnesioferrite in vesicular trachyandesite from Tolbachik Volcano, Kamchatka, Russia

Messaggio da Marco E. Ciriotti » gio 08 nov, 2018 9:58

Referenza:
▪ 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, 8, 514; https://doi.org/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 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.
Marco E. Ciriotti

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Massimo Russo
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Re: Copper-containing magnesioferrite in vesicular trachyandesite from Tolbachik Volcano, Kamchatka, Russia

Messaggio da Massimo Russo » gio 08 nov, 2018 12:35

Il link non funziona.
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Massimo Russo
INGV - Osservatorio Vesuviano

"Un minerale senza nome è solo un inutile pezzo di pietra" (Massimo Russo)

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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Re: Copper-containing magnesioferrite in vesicular trachyandesite from Tolbachik Volcano, Kamchatka, Russia

Messaggio da Marco E. Ciriotti » gio 08 nov, 2018 14:21

Il link non funziona.
Ufficialmente quello è.
Marco E. Ciriotti

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Massimo Russo
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Re: Copper-containing magnesioferrite in vesicular trachyandesite from Tolbachik Volcano, Kamchatka, Russia

Messaggio da Massimo Russo » gio 08 nov, 2018 15:28

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Massimo Russo
INGV - Osservatorio Vesuviano

"Un minerale senza nome è solo un inutile pezzo di pietra" (Massimo Russo)

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Marco E. Ciriotti
Messaggi: 24842
Iscritto il: ven 25 giu, 2004 11:31
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Re: Copper-containing magnesioferrite in vesicular trachyandesite from Tolbachik Volcano, Kamchatka, Russia

Messaggio da Marco E. Ciriotti » gio 08 nov, 2018 16:45

Perfetto. Grazie.
Marco E. Ciriotti

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