Phase relations and melting of nominally ‘dry’ residual eclogites with variable CaO/Na 2 O from 3 to 5 GPa and 1250 to 1500 °C; implications for refertilisation of upwelling heterogeneous mantle

Rosenthal, Anja; Yaxley, Gregory M.; Crichton, Wilson A.; Kovács, István J.; Spandler, Carl; Hermann, Jörg; Sándorné, Judit K.; Rose-Koga, Estelle; Pelleter, Anne-Aziliz (2018). Phase relations and melting of nominally ‘dry’ residual eclogites with variable CaO/Na 2 O from 3 to 5 GPa and 1250 to 1500 °C; implications for refertilisation of upwelling heterogeneous mantle. Lithos, 314-315, pp. 506-519. Elsevier 10.1016/j.lithos.2018.05.025

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This study investigates the phase and melting relations of nominally ‘dry’ residual eclogites (Res2 and Res3), with varying bulk CaO/Na2O ratios (4 and 12, respectively), from ~160 (5 GPa) to ~90 km (3 GPa) depth. Garnet, clinopyroxene and minor quartz/coesite are subsolidus phases in both compositions. In contrast to Res2, in Res3, the proportions of garnet always exceeding those of clinopyroxene. This also leads to higher modal quartz/coesite in Res3 relative to Res2.

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