Abstract
Many plutons preserve evidence of magma mixing between hydrous mafic magmas and resident felsic crystal-rich mushes. To investigate water transfer processes in such systems following thermal equilibration, we conducted 24 h experiments to establish the petrological evolution of a water-undersaturated (4 wt% H2O in the interstitial melt) quartz-bearing dacite crystal mush (0.5−0.8 in crystal fraction) intruded by a water-saturated (≥6 wt% H2O), initially crystal-free, andesite magma at 950 °C and 4 kbar (12 km depth). Our results show isothermal undercooling resulting from a change in liquidus temperatures of the interacting magmas due to their changing water content. Specifically, mafic samples dramatically crystallize during water escape into the felsic end-members and consequent increase in liquidus temperature. Conversely, the addition of water to the felsic mush reduces the liquidus temperature, leading to an increase in melt fraction. The experiments provide insights into how volatiles contribute to crystal mush rejuvenation (i.e., increase of melt fraction). However, H2O diffusion alone is not sufficient to promote melt extraction from short- and long-lived mushes in the Earth’s crust.
Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.
Acknowledgments
SNSF Grant EPM-PBEZP2_14922 (to M.P.), and ERC Advanced Grant CRITMAG, NERC SIMS award IMF534/0514 and a Wolfson Research Merit Award (to J.B.) supported this research. We acknowledge the following for their help: S. Kearns and B. Buse for EPMA, FEG-EPMA, and SEM analyses (University of Bristol); R. Hinton for SIMS analyses (EIMF, University of Edinburgh); C. Clapham and D. Hawley for technical support (University of Bristol); J. Riker (University of Bristol) for providing hydrous glass standards for SIMS; Alberto Luisoni AG (Switzerland) and Nabaltec AG (Germany) for supplying quartz and APYRAL 60CD used in the starting materials; M. Petrelli, C. Huber, and an anonymous reviewer for their helpful comments on an earlier version of the manuscript.
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Artikel in diesem Heft
- Review: Minerals in the Human Body
- Mineral precipitation and dissolution in the kidney
- Special Collection: Nanominerals and Mineral Nanoparticles
- Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Barometric constraints based on apatite inclusions in garnet
- Special collection: Olivine
- A comparison of olivine-melt thermometers based on DMg and DNi: The effects of melt composition, temperature, and pressure with applications to MORBs and hydrous arc basalts
- Special collection: Dynamics of magmatic processes
- Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes
- Special collection: Rates and depths of magma ascent on earth
- A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
- The S content of silicate melts at sulfide saturation: New experiments and a model incorporating the effects of sulfide composition
- Bond valence and bond energy
- Fluvial transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the Atlantic coast of South Africa
- Iron partitioning in natural lower-mantle minerals: Toward a chemically heterogeneous lower mantle
- Identifying biogenic silica: Mudrock micro-fabric explored through charge contrast imaging
- Compressibility and high-pressure structural behavior of Mg2Fe2O5
- Thermo-elastic behavior of grossular garnet at high pressures and temperatures
- Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
- Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
- Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
- Ca L2,3-edge near edge X-ray absorption fine structure of tricalcium aluminate, gypsum, and calcium (sulfo)aluminate hydrates
- Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite
- New Mineral Names
- Book Review
- Book Review: Geochemical Rate Models: An Introduction to Geochemical Kinetics
- Book Review
- Book Review: Oxygen: A Four Billion Year History
- Erratum
- Calibration of Fe XANES for high-precision determination of Fe oxidation state in glasses: Comparison of new and existing results obtained at different synchrotron radiation sources
Artikel in diesem Heft
- Review: Minerals in the Human Body
- Mineral precipitation and dissolution in the kidney
- Special Collection: Nanominerals and Mineral Nanoparticles
- Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
- Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
- Barometric constraints based on apatite inclusions in garnet
- Special collection: Olivine
- A comparison of olivine-melt thermometers based on DMg and DNi: The effects of melt composition, temperature, and pressure with applications to MORBs and hydrous arc basalts
- Special collection: Dynamics of magmatic processes
- Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes
- Special collection: Rates and depths of magma ascent on earth
- A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
- The S content of silicate melts at sulfide saturation: New experiments and a model incorporating the effects of sulfide composition
- Bond valence and bond energy
- Fluvial transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the Atlantic coast of South Africa
- Iron partitioning in natural lower-mantle minerals: Toward a chemically heterogeneous lower mantle
- Identifying biogenic silica: Mudrock micro-fabric explored through charge contrast imaging
- Compressibility and high-pressure structural behavior of Mg2Fe2O5
- Thermo-elastic behavior of grossular garnet at high pressures and temperatures
- Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
- Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
- Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
- Ca L2,3-edge near edge X-ray absorption fine structure of tricalcium aluminate, gypsum, and calcium (sulfo)aluminate hydrates
- Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite
- New Mineral Names
- Book Review
- Book Review: Geochemical Rate Models: An Introduction to Geochemical Kinetics
- Book Review
- Book Review: Oxygen: A Four Billion Year History
- Erratum
- Calibration of Fe XANES for high-precision determination of Fe oxidation state in glasses: Comparison of new and existing results obtained at different synchrotron radiation sources