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Journal of Petrology Advance Access originally published online on April 25, 2007
Journal of Petrology 2007 48(5):1001-1019; doi:10.1093/petrology/egm008
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

High-Pressure Melting of Eclogite and the P–T–X History of Tonalitic to Trondhjemitic Zoisite-Pegmatites, Münchberg Massif, Germany

Axel Liebscher1,2,*, Gerhard Franz2, Dirk Frei3 and Peter Dulski4

1Geoforschungszentrum Potsdam, Section 4.1 Experimental Geochemistry and Mineral Physics, Telegrafenberg, D-14473 Potsdam, Germany
2Technische Universität Berlin, Fachgebiet Petrologie, Ackerstrasse 71–79, D-13355 Berlin, Germany
3Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 København K, Denmark
4Geoforschungszentrum Potsdam, Section 3.3 Climate Dynamics and Sediments, Telegrafenberg, D-14473 Potsdam, Germany

RECEIVED DECEMBER 5, 2005; ACCEPTED FEBRUARY 19, 2007


  Abstract

Zoisite-bearing high-pressure pegmatites from the Münchberg Massif, Germany, provide an excellent example of the characteristics of the onset of metabasite melting at eclogite-facies conditions. The pegmatites were derived by partial melting of a mid-ocean ridge basalt (MORB)-like eclogite at T ≥680°C/2·3 GPa to 750°C/3·1 GPa, which produced small amounts of tonalitic to trondhjemitic melt. The melt concentrated locally in isolated, small melt pockets and crystallized primary zoisite as liquidus phase at P ≥2·3 GPa/680°C to 2·1 GPa/750°C. Compositional zoning of pegmatite zoisite records an ensuing multi-stage uplift history with successive, discrete crystallization events at 1·4 ± 0·2 GPa/650–700°C and 1·0 ± 0·1 GPa/620–650°C. Resorption textures indicate reheating and thermal perturbation of the whole system prior to each successive crystallization event. Final solidification of zoisite-pegmatites occurred at 0·9 ± 0·1 GPa/620–650°C. The data suggest that isolated melt + zoisite crystal mush pockets formed an integral part of the eclogite throughout uplift from melt formation at T ≥680°C/2·3 GPa to 750°C/3·1 GPa to final solidification at ~0·9 GPa/620–630°C; that is, over a depth range of 45–60 km. The entire pegmatite-forming process was probably fluid conserving: fluid present during melt formation was trapped by fully or nearly water-saturated siliceous melts, whereas fluid liberated during pegmatite crystallization interacted with dehydrated eclogite-facies assemblages to form amphibolite-facies hydrous minerals. A set of empirical Dmelt/eclogite values based on mean zoisite-pegmatite and eclogite composition were used to model the onset of partial high-pressure melting of metabasites.

KEY WORDS: adakite; high-pressure melting; pegmatite; trondhjemite; zoisite

*Corresponding author. Present address: Technische Universität Berlin, Fachgebeit Petrologie Ackerstrasse 71–79, D-13355 Berlin, Germany. Telephone: +49-(0)30-314 72091. Fax: +49-(0)30-314 72218. E-mail: axel.liebscher{at}tu-berlin.de


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