Crystallization Kinetics of Alkali Feldspar in Peralkaline Rhyolitic Melts: Implications for Pantelleria Volcano
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چکیده
منابع مشابه
H2O diffusion in peralkaline to peraluminous rhyolitic melts
The diffusion of water in a peralkaline and a peraluminous rhyolitic melt was investigated at temperatures of 714–1,493 K and pressures of 100 and 500 MPa. At temperatures below 923 K dehydration experiments were performed on glasses containing about 2 wt% H2Ot in cold seal pressure vessels. At high temperatures diffusion couples of water-poor (\0.5 wt% H2Ot) and water-rich (*2 wt% H2Ot) melts ...
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The formation of peralkaline melts is generally recognized to be related to enrichment of the mantle in sodium or potassium during a metasomatic event that predated magma generation. The wide range in mineral assemblages, mineral compositions, and fluid compositions in peralkaline melts are, to a large extent, a function of the sodium/potassium content of these mantle-metasomatizing fluids, whi...
متن کاملWater diffusion in Mount Changbai peralkaline rhyolitic melt
Diffusion couple experiments with wet half (up to 4.6 wt%) and dry half were carried out at 789–1,516 K and 0.47–1.42 GPa to investigate water diffusion in a peralkaline rhyolitic melt with major oxide concentrations matching Mount Changbai rhyolite. Combining data from this work and a related study, total water diffusivity in peralkaline rhyolitic melt can be expressed as:
متن کاملCrystallization kinetics and rigidity percolation in glassforming melts
Crystallization kinetics and rigidity percolation in glassforming melts I. Avramov, R. Keding, C. Rüssel Otto-Schott-Institut, Universität Jena, Fraunhoferstrasse 6, D-07743, Germany * On leave from the Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria e-mail: [email protected] Corresponding author. Tel +49-3641 948501; fax +49-3641 948502 e-mail: cai@r...
متن کاملH O diffusion in rhyolitic melts and glasses
H O diffusion plays a major role in bubble growth and volcanic eruption. We report a comprehensive study of H O 2 2 diffusion in rhyolitic melts and glasses. This new study and previous investigations together cover a wide range of Ž . conditions: 400–12008C, 0.1–810 MPa, and 0.1–7.7 wt.% total H O content H O . In order to constrain how the 2 2 t diffusivity depends on H O , both the diffusion...
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2020
ISSN: 2296-6463
DOI: 10.3389/feart.2020.00177