Other
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..129h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 2, pp.129-132
Other
3
Scientific paper
The melting temperatures of calcite and magnesite in the presence of excess CO 2 have been measured using Ag 2 C 2 O 4 in sealed capsules m a piston-cylinder apparatus. At 27 kbar, 11.5 wt % CO 2 dissolves in molten CaCO 2 , depressing the freezing temperature from 1610 to 1505°C; and 6.5 wt % CO 2 dissolves in molten MgCO 3 , depressing the freezing temperature from 1590 to 1510°C. The eutectic between calcite and lime was located at 1385°C at 27 kbar. These and other new results, combined with previously published data, permit completion of PT diagrams for the systems CaO-CO 2 and MgO-CO 2 from 1 bar to 35 kbar. The dissociation curve for each carbonate terminates at an invariant point where melting begins, at 40 bars and 1230°C for CaO-CO 2 and 23 kbar and 1550°C for MgO-CO 2 The differences between the two systems are explained by the different solubilities of CO 2 in the invariant liquids consequent upon the large pressure difference between the locations of these two invariant points. The results show that the temperatures for the beginning of melting of carbonates in the asthenosphere are lowered by about 100°C in the presence of CO 2 .
Huang Wuu-Liang
Wyllie Peter J.
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