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American Mineralogist; February 2006; v. 91; no. 2-3; p. 435-440; DOI: 10.2138/am.2006.1910
© 2006 Mineralogical Society of America
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Experiments on CaCO3-MgCO3 solid solutions at high pressure and temperature

Alessandra Buob1, Robert W. Luth2, Max W. Schmidt1 and Peter Ulmer1,*

1 Department of Earth Sciences, ETH-Zentrum, Zurich, Switzerland
2 C.M. Scarfe Laboratory for Experimental Petrology; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada

Correspondence: * E-mail: peter.ulmer{at}erdw.ethz.ch

Multi-anvil experiments have been performed in the system CaCO3-MgCO3 at pressures of 5.0–7.0 GPa and temperatures of 800–1600 °C. The reaction dolomite = aragonite + magnesite has been reversed and located near 750 °C at 5.0 GPa, 900 °C at 6.0 GPa, and 1000 °C at 7.0 GPa. Between 5 and 6 GPa, the reaction boundary is strongly curved and its dP/dT slope increases from 2 to 12 MPa/°C, expanding the stability field of dolomite. This increase is attributed to increasing Ca-Mg disorder in the dolomite. In addition to the reaction boundary, an isobaric section of CaCO3-MgCO3 has been determined at 6.0 GPa. There is a two-phase field of aragonite + dolomite on the Ca-rich side, which closes before minimum melting temperatures of 1350 °C are reached. The two-phase field on the Mg-rich side, where dolomite + magnesite coexist, intersects with the solidus. Inferred minimum melts are close to dolomite composition suggesting congruent melting of dolomite at 6 GPa. The melt compositions and temperatures in the pure carbonate system are surprisingly similar to solidus phase relations in the CMAS-CO2 system, implying that minimum melting conditions in carbonated peridotite at high pressures are dominated and controlled by the carbonate component.

Key Words: experimental petrology • high-pressure studies • phase equilibria • metamorphic petrology




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