Publication Date:
2022-03-16
Description:
Solubility experiments were performed on a trachyte and a pantellerite from Pantelleria.
The trachyte has SiO2 Æ 65.2 wt%, Al2O3 Æ 15.2 wt% and a peralkaline index (P.I. Æ molar[(Na2OÅ
K2O)/Al2O3]) » 1 while the pantellerite has SiO2 Æ 72.2 wt%, Al2O3 Æ 11 wt% and a P.I. Æ 1.3.
Solubility experiments were performed in the pressure range of 50–300 MPa at T Æ 950 °C for the
trachyte and 50–200MPa at T Æ 850 °C for the pantellerite. The water content of experimental glasses
was determined by Karl Fischer titration, elemental analyser and FT–IR spectroscopy. Water content
appears similar in both compositions for analogous pressure conditions, varying from »2.5 wt% at
50 MPa to »5.8 at 200 MPa. Comparison of the experimental data with the thermodynamic models
shows that the empirical model of Moore et al. [1998] better matches the experimental data for both
compositions, while the thermodynamicmodels of Papale et al. [2006] and Ghiorso and Gualda [2015]
tend to overestimate melt water content, probably due to the paucity of peralkaline melt compositions
used for calibration. One inference of these new solubility data is on MI-derived depth of felsic
reservoirs at Pantelleria which deepens from2.4 to 3.5 km.
Description:
Published
Description:
315-331
Description:
4V. Processi pre-eruttivi
Description:
JCR Journal
Keywords:
Trachyte,
;
Pantellerite
;
04.08. Volcanology
;
04.04. Geology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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