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Magma properties at deep Earth’s conditions from electronic structure of silica

S. Petitgirard1,

1Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, D-95490, Germany

C.J. Sahle2,

2European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France

C. Weis3,

3Fakultät Physik / DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany

K. Gilmore2,

2European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France

G. Spiekermann4,

4Institut für Geowissenschaften, Universität Potsdam, Potsdam, Germany

J.S. Tse5,

5Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada

M. Wilke4,

4Institut für Geowissenschaften, Universität Potsdam, Potsdam, Germany

C. Cavallari2,

2European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France

V. Cerantola2,

2European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France

C. Sternemann3

3Fakultät Physik / DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Petitgirard, S., Sahle, C.J., Weis, K., Gilmore, K, Spiekermann, G., Tse, J.S., Wilke, M., Cavallari, C., Cerantola, V., Sternemann, C. (2019) Magma properties at deep Earth’s conditions from electronic structure of silica. Geochem. Persp. Let. 9, 32–37.

Research funded by DFG grant no. PE 2334/1-1, DFG grant no. INST 91/315-1 FUGG, and the BMBF (05K13PE2 and 05K16PE1).

Geochemical Perspectives Letters v9  |  doi: 10.7185/geochemlet.1902
Received 08 October 2018  |  Accepted 21 December 2018  |  Published 6 February 2019
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 XRS spectra of Si L2,3 and O K-edge up to 110 GPa from experiment and calculations. (a,b) Si L2,3 spectra. (c,d) O K-edge spectra. Grey spectra in a and c show measurements at the starting pressure indicated on the right, the coloured spectra correspond to the final pressure. (e) Atomic structure of SiO2 from MD.
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Figure 2 (a) Silicon L2,3- and (b) Oxygen K-edge onset position versus pressure (GPa). Arrows show the evolution of the edge during the measurement at ~20 GPa and ~60 GPa.
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Figure 3 Coordination evolution of SiO2 from MD. (a) Coordination of Si as a function of pressure. (b) Percentage of species [4]Si, [5]Si, [6]Si and [7]Si.
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