Syn-eruptive desulfidation of pyrrhotite in the pumice of the Sakurajima 1914-15 eruption: Implication for potential magma ascent rate meter

Syn-eruptive desulfidation of pyrrhotite in the pumice of the Sakurajima 1914-15 eruption: Implication for potential magma ascent rate meter

Pyrrhotite (Po) occurs as inclusions and as isolated crystals in pumice from the 1914-15 eruption of the Sakurajima volcano, Kyushu, Japan. The Po crystals have partly reacted to form spongy Fe oxides. A similar texture has been reported in some previous studies (Hattori, 1993), but the mineral phas...

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Veröffentlicht in:Journal of Mineralogical and Petrological Sciences 2012, Vol.107(5), pp.206-211
Hauptverfasser: MATSUMOTO, Keiko, NAKAMURA, Michihiko
Format: Artikel
Sprache:eng
Schlagworte:
Desulfidation
Iron
Magma
Magma ascent rate
Mathematical analysis
Oxidation
Oxides
Pumice
Pyrrhotite
Sakurajima volcano
Spongy magnetite
Surface layer
Texture
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Zusammenfassung:Pyrrhotite (Po) occurs as inclusions and as isolated crystals in pumice from the 1914-15 eruption of the Sakurajima volcano, Kyushu, Japan. The Po crystals have partly reacted to form spongy Fe oxides. A similar texture has been reported in some previous studies (Hattori, 1993), but the mineral phases and formation processes of the spongy Fe oxides have not been clarified. Our quantitative and compositional map analyses with electron probe microanalysis (EPMA) reveal that the spongy Fe oxides are mostly magnetite (Mt), with a thin rim (
ISSN:1345-6296
1349-3825
DOI:10.2465/jmps.120621b