Search Results - "Brooker, R. A"

An experimental study of amphibole stability in low-pressure granitic magmas and a revised Al-in-hornblende geobarometer by Mutch, E. J. F., Blundy, J. D., Tattitch, B. C., Cooper, F. J., Brooker, R. A.

“…We report new experimental data on the composition of magmatic amphiboles synthesised from a variety of granite (sensu lato) bulk compositions at near-solidus…”
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Deep pre-eruptive storage of silicic magmas feeding Plinian and dome-forming eruptions of central and northern Dominica (Lesser Antilles) inferred from volatile contents of melt inclusions by Balcone-Boissard, H., Boudon, G., Blundy, J. D., Martel, C., Brooker, R. A., Deloule, E., Solaro, C., Matjuschkin, V.

“…Volatiles contribute to magma ascent through the sub-volcanic plumbing system. Here, we investigate melt inclusion compositions in terms of major and trace…”
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Coupled Interactions between Volatile Activity and Fe Oxidation State during Arc Crustal Processes by Humphreys, M C S, Brooker, R A, Fraser, D G, Burgisser, A, Mangan, M T, McCammon, C

“…Arc magmas erupted at the Earth's surface are commonly more oxidized than those produced at mid-ocean ridges. Possible explanations for this high oxidation…”
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Magma storage conditions beneath Dabbahu Volcano (Ethiopia) constrained by petrology, seismicity and satellite geodesy by Field, L., Blundy, J., Brooker, R. A., Wright, T., Yirgu, G.

“…A variety of methods exist to constrain sub-volcanic storage conditions of magmas. Petrological, seismological and satellite geodetic methods are integrated to…”
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The effect of silica activity on the incorporation mechanisms of water in synthetic forsterite: a polarised infrared spectroscopic study by Kohn, S. C., Brooker, R. A., Lemaire, C.

“…Pure forsterite crystals were grown from hydrous melts using controlled cooling experiments at 2.0 GPa and varying the bulk Mg/Si ratio from 2.0 to 1.5…”
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The 'zero charge' partitioning behaviour of noble gases during mantle melting by Brooker, R. A, Du, Z, Blundy, J. D, Kelley, S. P, Allan, N. L, Wood, B. J, Chamorro, E. M, Wartho, J.-A, Purton, J. A

“…Noble-gas geochemistry is an important tool for understanding planetary processes from accretion to mantle dynamics and atmospheric formation. Central to much…”
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Trace elements and Li isotope systematics in Zabargad peridotites: evidence of ancient subduction processes in the Red Sea mantle by Brooker, R.A., James, R.H., Blundy, J.D.

“…Mantle peridotites exposed on Zabargad Island in the Red Sea (Egypt) record a range of features, most of which have been attributed to recent rifting events…”
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Oxidised phase relations of a primitive basalt from Grenada, Lesser Antilles by Stamper, C. C., Melekhova, E., Blundy, J. D., Arculus, R. J., Humphreys, M. C. S., Brooker, R. A.

“…A series of liquidus determinations is reported for a primitive arc basalt (15.4 wt % MgO, 45.5 wt % SiO 2 ) from Grenada, Lesser Antilles, at anhydrous, H 2…”
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Ar and K partitioning between clinopyroxene and silicate melt to 8 GPa by Chamorro, E.M., Brooker, R.A., Wartho, J.-A., Wood, B.J., Kelley, S.P., Blundy, J.D.

“…The relative incompatibility of Ar and K are fundamental parameters in understanding the degassing history of the mantle. Clinopyroxene is the main host for K…”
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Three-liquid immiscibility and the origin of carbonatites by Brooker, R. A, Hamilton, D. L

“…THE relationship of rock types involved in carbonatite complexes has provoked much debate1-4. One favoured theory of origin involves the immiscible separation…”
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An explosive–intrusive subglacial rhyolite eruption at Dalakvísl, Torfajökull, Iceland by Tuffen, H., McGarvie, D. W., Pinkerton, H., Gilbert, J. S., Brooker, R. A.

“…This paper describes unusual rhyolitic deposits at Dalakvísl, Torfajökull, Iceland that were emplaced during a Quaternary subglacial eruption. Despite its…”
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Water solubility in trachytic melts by Di Matteo, V., Carroll, M.R., Behrens, H., Vetere, F., Brooker, R.A.

“…New data on water solubility in trachytic melts at pressures from 20 to 200 MPa and 850 °C are reported. Three trachytes, which differ mainly in Na/K ratio,…”
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Silicate-Carbonate Liquid Immiscibility and Phase Relations in the System SiO2-Na2O-Al2O3-CaO-CO2 at 0·1-2·5 GPa with Applications to Carbonatite Genesis by Brooker, R. A., Kjarsgaard, B. A.

“…We present new experiments, combined with a re-evaluation of published data, to characterize the topology of the silicate-carbonate two-liquid solvus in the…”
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Volatile diffusion in silicate melts and its effects on melt inclusions by D. R. Baker, C. Freda, R. A. Brooker, P. Scarlato

“…A compendium of diffusion measurements and their Arrhenius equations for water, carbon dioxide, sulfur, fluorine, and chlorine in silicate melts similar in…”
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Solubility, speciation and dissolution mechanisms for CO2 in melts on the NaAlO2–SiO2 join by Brooker, R.A., Kohn, S.C., Holloway, J.R., McMillan, P.F., Carroll, M.R.

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Rapid pre-eruptive mush reorganisation and atmospheric volatile emissions from the 12.9 ka Laacher See eruption, determined using apatite by Humphreys, M.C.S., Smith, V.C., Coumans, J.P., Riker, J.M., Stock, M.J., de Hoog, J.C.M., Brooker, R.A.

“…Magma is commonly thought to be stored as a crystal-rich mush within vertically extensive, crustal storage regions. A key unknown is how to remobilise and…”
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Hydrogen incorporation and charge balance in natural zircon by De Hoog, J.C.M., Lissenberg, C.J., Brooker, R.A., Hinton, R., Trail, D., Hellebrand, E.

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An experimentally-validated numerical model of diffusion and speciation of water in rhyolitic silicate melt by Coumans, J.P., Llewellin, E.W., Humphreys, M.C.S, Nowak, M., Brooker, R.A., Mathias, S.A., McIntosh, I.M.

“…The diffusion of water through silicate melts is a key process in volcanic systems. Diffusion controls the growth of the bubbles that drive volcanic eruptions…”
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The nature of erupting kimberlite melts by Sparks, R.S.J., Brooker, R.A., Field, M., Kavanagh, J., Schumacher, J.C., Walter, M.J., White, J.

“…The compositions of kimberlite magma and associated melts during eruption and hypabyssal intrusion are elusive due to contamination by xenolithic material and…”
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Rheological controls on the eruption potential and style of an andesite volcano: A case study from Mt. Ruapehu, New Zealand by Kilgour, G.N., Mader, H.M., Blundy, J.D., Brooker, R.A.

“…The evolving magma rheology of three recent Ruapehu eruptions (1969, 1977, and 1995) is estimated using a combination of thermodynamic models and rheological…”
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