Computer Science
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..321b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 3, pp.321-328
Computer Science
9
Scientific paper
Mixtures of pure dry CaCO 3 and MgCO 3 were reacted at 10 kbar in a piston-cylinder apparatus. Solidus and liquidus boundaries were delineated by interpretation of quenched textures. X-ray determined compositions of quenched carbonates are not a reliable guide to the phase relations. The binary melting loop for CaCO 3 -MgCO 3 extends from CaCO 3 at 1460°C through a liquidus minimum near 30 wt% MgCO 3 and 1075°C, and it is terminated at the incongruent melting reaction for dolomite solid solution at 1125° C (liquid with 32 wt% MgCO 3 ) Magnesite solid solution dissociates at 1090°C to produce dolomite + periclase + CO 2 , truncating the dolomite-magnesite solvus. The 10 kb liquidus minimum at 1075°C and 30 wt% MgCO 3 occurs at lower temperature and higher Ca / Mg ratio than the 27 kbar liquidus minimum at 1290°C and 38 wt% MgCO 3 . This relationship suggests that the first liquid produced by melting of a carbonate-bearing peridotite has increasing Mg / Ca ratio with increasing pressure. These phase relations provide part of the framework required to trace paths of crystallization of kimberlite and carbonatite magmas.
Byrnes Alan P.
Wyllie Peter J.
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