Subsolidus and melting relationships for calcite, magnesite and the join CaCO 3 -MgCO 3 36 kb

Details Subsolidus and melting relationships for calcite, magnesite and the join CaCO 3 -MgCO 3 36 kb Subsolidus and melting relationships for calcite, magnesite and the join CaCO 3 -MgCO 3 36 kb

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39...35i&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 1, pp.35-53

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40

Scientific paper

Subsolidus and melting relations for the CaCO 3 -MgCO 3 join at 30 kb have been determined using piston-cylinder apparatus. Data are also presented for the melting curve of CaCO 3 to 30 kb, the decomposition and melting curves of MgCO 3 to 36 kb, and the calcite-aragonite transition at 800°C, 950°C and 1100°C. At 30kb, the melting loop for the CaCO 3 -MgCO 3 join extends from 1610°C (CaCO 3 ) to 1585°C (MgCO 3 ) through a liquidus minimum at 1290°C (near 42 mole% MgCO 3 ). The dolomite-magnesite solvus barely intersects the 30 kb melting loop to produce a peritectic reaction at 1385°C. Integration of the new experimental data with other published data permits construction of a complete P - T projection and a sequence of isobars for the CaCO 3 -MgCO 3 join for pressures between 5 and 30 kb. The phase relations for this join provide part of the essential framework of the model peridotite system CaO-MgO-SiO 8 -CO 2 -H 2 O, which has particular application to the origin of carbonatitic and kimberlitic magmas. In light of the accumulating evidence for CO 2 in various forms within the upper mantle and of its effect on magmatic processes, analysis of the melting relations in this system is of considerable importance.

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