Abstract
In-situ EXAFS combined with a Paris-Edinburgh press (PEP) is an outstanding tool to investigate the local environment of trace elements in melts at high pressure and temperature. A novel design of the pressure assembly ensures a highly stable experimental setup (reaching temperatures of up to 2000 K at 2.5 GPa) while permitting the necessary level of X- ray transmission. This study focuses on the structural incorporation of the geochemically important trace elements Y and Sr in sodium-rich silicate-carbonate melts. Y and Sr K edge EXAFS were collected in transmission mode of the melt (at ∼2.5 GPa, 1600 K) and its respective quench products. Distinct changes in the XANES region suggest a change in site symmetry during the cooling process.
Highlights
Carbonate-bearing silicate and carbonate melts possess unique physical properties
Y and Sr incorporation in carbonated silicate melts This study focuses on unraveling the influence of carbonate concentration on the structural incorporation of the geochemically important trace elements Y and Sr in silicate and carbonate melts in the system Na2O-CaO-Al2O3-SiO2-CO2 (Figure 3), which resembles a simplified composition of the rocks found at the Oldoinyo Lengai
The quench was accomplished by cutting the power supply to the graphite heater
Summary
Journal of Physics: Conference Series 712 (2016) 012083 doi:10.1088/1742-6596/712/1/012083. J Pohlenz, S Pascarelli, O Mathon, S Belin, A Shiryaev, O Safonov, A Veligzhanin, V Murzin, T Irifune and M Wilke1 1Helmholtz Centre German Research Centre for Geosciences, Potsdam, Germany, 2ESRF European Synchrotron Radiation Facility, Grenoble, France, 3Synchrotron SOLEIL, GIF-sur-YVETTE, France, 4IPCE, Moscow, Russia, 5Institute of Experimental Mineralogy RAS, Chernogolovka, Russia, 6Kurchatov Institute, Moscow, Russia, 7DESY, Hamburg, Germany, 8Ehime University, Matsuyama, Japan
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