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In the Ranmal migmatite complex, non-anatectic foliated granite protoliths can be traced to polyphase migmatites. Structural–microtextural relations and thermobarometry indicate that syn-deformational segregation–crystallization of  in situ  stromatic and diatexite leucosomes occurred at 800°C and 8 kbar. The protolith, the neosome, and the mesosome comprise quartz, K-feldspar, plagioclase, hornblende, biotite, sphene, apatite, zircon, and ilmenite, but the modal mineralogy differs widely. The protolith composition is straddled by element abundances in the leucosome and the mesosome. The leucosomes are characterized by lower CaO, FeO+MgO, mg-number, TiO 2  , P 2 O 5  , Rb, Zr and total rare earth elements (REE), and higher SiO 2  , K 2 O, Ba and Sr than the protolith and the mesosome, whereas Na 2 O and Al 2 O 3  abundances are similar. The protolith and the mesosome have negative Eu anomalies, but protolith-normalized abundances of REE-depleted leucosomes show positive Eu anomalies. The congruent melting reaction for leucosome production is inferred to be 0·325 quartz+0·288 K-feldspar+0·32 plagioclase+0·05 biotite+0·014 hornblende+0·001 apatite+0·001 zircon+0·002 sphene=melt. Based on the reaction, large ion lithophile element, REE and Zr abundances in model melts computed using dynamic melting approached the measured element abundances in leucosomes for &gt;0·5 mass fraction of unsegregated melts within the mesosome. Disequilibrium-accommodated dynamic melting and equilibrium crystallization of melts led to uniform plagioclase composition in migmatites and REE depletion in leucosome.

journal of petrology

Shear Zone-hosted Migmatites (Eastern India): the Role of Dynamic Melting in the Generation of REE-depleted Felsic Melts, and Implications for Disequilibrium Melting