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Quartz-bearing C-O-H fluid inclusions diamond: Retracing the pressure-temperature path in the mantle using calibrated high temperature IR spectroscopy |
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| Authors: | Emma L Tomlinson Paul F McMillan Ming Zhang Simon AT Redfern |
| Institution: | a Department of Geology, Royal Holloway University of London, Egham Hill, Egham, Surrey TW20 0EX, UK b Department of Chemistry and Materials Chemistry Centre, University College London, 20 Gordon Street, London WC1H 0AJ, UK c Davy-Faraday Research Laboratory, Royal Institution, 21 Albemarle Street, London W1S 4BX, UK d Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK e Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK |
| Abstract: | Infrared spectra of C-O-H micro-inclusions were collected from a micro-inclusion bearing diamond during step-heating and freezing experiments to examine fluid speciation as a function of pressure and temperature. The inclusions contain H2O, CO2, carbonate, apatite, quartz and mica, which together represent the oxidising remnant mantle fluid composition after diamond crystallisation. The internal pressure of the inclusions, measured from calibrated shifts of the quartz peaks, increases from 1.3 GPa at ambient temperature, to approximately 4-5 GPa at 737 °C, close to the conditions of crystallisation of the host diamond in the mantle. |
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