Publication Date:
2017-04-04
Description:
We report new data on water solubility in two melt compositions representative of volcanic units of the Campi Flegrei Caldera
(Italy). The first composition is a primitive shoshonite and the second one is a more evolved latitic composition that have been
chosen because of their less evolved nature compared to the other erupted products of Campi Flegrei. Water solubility was
investigated at pressures from 25 to 200 MPa and 1200 °C following synthesis in an Internal Heated Pressure Vessel (IHPV). The
glasses obtained from water-saturated experiments were analysed using both Fourier Transform Infra Red spectroscopy (FTIR) and
Karl Fischer Titration (KFT). KFT was used as an independent method to obtain water concentration for the calibration of molar
absorptivities of infrared bands at ∼3550 cm−1 (total water), ∼4500 cm−1 (hydroxyl groups) and ∼5200 cm−1 (molecular water).
Water solubility in the shoshonitic melts is similar to that of a basalt while a slightly higher water solubility is observed for the
latitic composition.
As regards the speciation, we have investigated the water speciation for the shoshonitic composition only and we have made a
comparison between the data resulting using different molar absorptivities obtained for basaltic compositions similar to our
shoshonite.
Description:
Published
Description:
113–124
Description:
reserved
Keywords:
Water solubility
;
Shoshonitic melts
;
Latitic melts
;
FTIR
;
Molar absorptivity
;
Water speciation
;
04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks
;
04. Solid Earth::04.01. Earth Interior::04.01.05. Rheology
;
04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
387108 bytes
Format:
application/pdf
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