Water solubility in trachytic and pantelleritic melts: an experimental study - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Comptes Rendus. Géoscience Année : 2021

Water solubility in trachytic and pantelleritic melts: an experimental study

Résumé

Solubility experiments were performed on a trachyte and a pantellerite from Pantelleria. The trachyte has SiO 2 = 65.2 wt%, Al 2 O 3 = 15.2 wt% and a peralkaline index (P.I. = molar[(Na 2 O + K 2 O)/Al 2 O 3 ]) ∼ 1 while the pantellerite has SiO 2 = 72.2 wt%, Al 2 O 3 = 11 wt% and a P.I. = 1.3. Solubility experiments were performed in the pressure range of 50-300 MPa at T = 950°C for the trachyte and 50-200 MPa at T = 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 thermodynamic models 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 from 2.4 to 3.5 km.
Fichier principal
Vignette du fichier
CRGEOS_2021__353_S2_A8_0.pdf (1017.24 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03429252 , version 1 (15-11-2021)

Licence

Paternité

Identifiants

Citer

Pierangelo Romano, Ida Di Carlo, Joan Andújar, Silvio G Rotolo. Water solubility in trachytic and pantelleritic melts: an experimental study. Comptes Rendus. Géoscience, 2021, 353 (S2), pp.1-17. ⟨10.5802/crgeos.75⟩. ⟨insu-03429252⟩
34 Consultations
25 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More