Journal
PHYSICS AND CHEMISTRY OF MINERALS
Volume 42, Issue 1, Pages 73-81Publisher
SPRINGER
DOI: 10.1007/s00269-014-0701-1
Keywords
Mg-carbonate melting; High-temperature decomposition boundary; Phase relations; High-pressure experiment; Laser heating; Raman spectroscopy
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Funding
- German Research Foundation (DFG)
- Russian Foundation for Basic Research [13-05-00835, 14-05-31142, 11-05-00401]
- DFG [DU 954-8/1]
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Magnesium carbonate MgCO3 (magnesite) was experimentally studied at pressures of 12-84 GPa and temperatures between 1,600 and 3,300 K. We applied the high-pressure technique using a multianvil press and a diamond anvil cell with laser heating. The phase relations and melting of magnesite were investigated by means of Raman and time-resolved multi-wavelength spectroscopy. Magnesite is found to melt congruently within the entire studied pressure range at temperatures of 2,100-2,650 K. At temperatures above 2,700 K, we observed decomposition of magnesite with formation of MgO and a carbon phase (diamond). Our results demonstrate that at high pressures, the magnesium carbonate melt can exist at a wide range of thermodynamic conditions.
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