Hydrogen incorporation into forsterite in Mg2SiO4-K2Mg(CO3)2-H2O and Mg2SiO4-H2O-C at 7.5-14.0 GPa

K. D. Litasov, A. F. Shatskiy, Yu N. Pal'yanov, A. G. Sokol, T. Katsura, E. Ohtani

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Abstract

Experiments on water solubility in forsterite in the systems Mg2SiO4-K2Mg(CO3)2-H2O and Mg2SiO4-H2O-C were conducted at 7.5-14.0 GPa and 1200-1600 °C. The resulting crystals contain 448 to 1480 ppm water, which is 40-70% less than in the forsterite-water system under the same conditions. This can be attributed to lower water activity in the carbonate-bearing melt. The water content of forsterite was found to vary systematically with temperature and pressure. For instance, at 14 GPa in the system forsterite-carbonate-H2O the H2O content of forsterite drops from 1140 ppm at 1200 °C to 450 ppm at 1600 °C, and at 8 GPa it remains constant or increases from 550 to 870 ppm at 1300-1600 °C. Preliminary data for D-H-bearing forsterite are reported. Considerable differences were found between IR spectra of D-H- and H-bearing forsterite. The results suggest that CO2 can significantly affect the width of the olivine-wadsleyite transition, i.e., the 410-km seismic discontinuity, which is a function of the water content of olivine and wadsleyite.

Original languageEnglish
Pages (from-to)1129-1138
Number of pages10
JournalRussian Geology and Geophysics
Volume50
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • carbon
  • carbonate
  • fluid
  • forsterite
  • upper mantle
  • water

ASJC Scopus subject areas

  • Geophysics
  • Geology

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    Litasov, K. D., Shatskiy, A. F., Pal'yanov, Y. N., Sokol, A. G., Katsura, T., & Ohtani, E. (2009). Hydrogen incorporation into forsterite in Mg2SiO4-K2Mg(CO3)2-H2O and Mg2SiO4-H2O-C at 7.5-14.0 GPa. Russian Geology and Geophysics, 50(12), 1129-1138. https://doi.org/10.1016/j.rgg.2009.11.011