Computer Science
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92..347h&link_type=abstract
Earth and Planetary Science Letters, Volume 92, Issue 3-4, p. 347-356.
Computer Science
39
Scientific paper
A melting experiment was carried out at 3 GPa to determine the equilibrium dihedral angle for a dolomitic melt (approximate composition: 35% CO2, 20% CaO, 20% MgO, 6% FeO, 12% SiO2, 4% Al2O3) in an olivine matrix. The value obtained was 28°, and is less than the value of 60° required to form an interconnected network. Therefore, because of their low viscosity, carbonate-rich melts can separate from their residue at melt fractions as small as 0.02% in 10 Ma. Any movement of such melts will dominate the incompatible trace element distributions in the mantle and hence the isotopic systematics of the crust and mantle. Upwelling carbonate melts react with the olivine matrix at pressures of about 1.8 GPa to form CO2 gas. The dihedral angle of free CO2 is greater than 60°, and the gas will therefore be unable to separate until the porosity reaches 8%. It is then likely to do so explosively. Where the reaction with the matrix occurs, the matrix will be metasomatised by the metal oxides carried by the carbonate melt.
Hunter Robert H.
McKenzie Dan
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