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New experimental data on biotite + magnetite + sanidine saturated phonolitic melts and application to the estimation of magmatic water fugacity
-
Essandro Fabbrizio
,
Paul J. Rouse
Published/Copyright:
March 31, 2015
Abstract
New experimental data are presented that allows the biotite-magnetite-sanidine equilibrium to be used for estimating water fugacity (fH₂O) in hydrous phonolitic magmas. It is also demonstrated that the partly ionic model gives the best estimate for the annite activity (aannite). Crystallization experiments were carried out on a representative sample of peralkaline, phonolitic obsidian of Montaña Blanca (MB) pumice deposit, Tenerife, Canary Islands. Experiments were performed from 720.810 °C and 50.250 MPa. Redox conditions were varied between NNO (nickel + nickel oxide) + 1 (±0.2) and FMQ (fayalite + magnetite + quartz). The majority of the experiments were done under H₂O saturation conditions (Pwater = Ptotal). Several experiments were done using a mixed H2O-CO2 fluid phase whereas in other experiments 10 or 20 wt% powdered alkali feldspar was added to the starting material. The pre-eruptive fH₂O of the Montaña Blanca magma is estimated at 676 ± 200 bars. The pre-eruptive fH₂O for the Fish Canyon tuff (753.2978 bars) and Bishop tuff rhyolite (1065.2440 bars) were also calculated, as well as fH₂O for metamorphic biotite from Au Sable Forks (≈ 130 bars). The results of this study suggest that this geohygrometer can be used in any magmatic system in which biotite-magnetite-sanidine is a stable assemblage.
Received: 2005-8-5
Accepted: 2006-5-9
Published Online: 2015-3-31
Published in Print: 2006-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Crystallization experiments;
geohygrometer;
phonolitic magmas;
water fugacity
Articles in the same Issue
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- A new approach to determine and quantify structural units in silicate glasses using micro-reflectance Fourier-Transform infrared spectroscopy
- Titanium incorporation and VITi3+ -IVTi4+ charge transfer in synthetic diopside
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