PHASE RELATIONS IN CARBONATE SYSTEMS AT PRESSURES AND TEMPERATURES OF LITHOSPHERIC MANTLE: REVIEW OF EXPERIMENTAL DATA
The paper presents a synopsis of experimentally constrained phase relations in carbonate systems. Three sections of the paper consider, respectively, PT diagrams of simple carbonates (MgCO 3, CaCO 3, FeCO 3, BaCO 3, SrCO 3, K 2CO 3, and Na 2CO 3); isobaric T-X diagrams of binary and ternary systems (CaCO 3-MgCO 3, CaCO3-FeCO 3, CaCO 3-FeCO 3-MgCO 3, BaCO 3-CaCO 3, SrCO 3-CaCO 3, BaCO 3-SrCO 3, CaCO 3-MgCO 3-BaCO 3, CaCO 3-MgCO 3-SrCO 3, BaCO 3-CaCO 3-SrCO 3, BaCO 3-MgCO 3-SrCO 3, Na 2CO 3-CaCO 3, and K 2CO 3-CaCO 3), and T-X diagrams of the systems MgCO 3-FeCO 3, MgCO 3-CaCO 3, CaCO 3-FeCO 3, MgCO 3-FeCO 3-CaCO 3, K 2CO 3-MgCO 3, Na 2CO 3-MgCO 3, K 2CO 3-FeCO 3, Na 2CO 3-FeCO 3, K 2CO 3-CaCO 3, Na 2CO 3-CaCO 3, K 2CO 3-FeCO 3-MgCO 3, Na 2CO 3-FeCO 3-MgCO 3, K 2CO 3-CaCO 3-MgCO 3, and Na 2CO 3-CaCO 3-MgCO 3 at 6 GPa. The last section deals with temperatures of carbonate magma generation in the upper mantle and with melt compositions. In conclusion, prospects are outlined for further research of phase relations in carbonate system at high pressures and temperatures.