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Journal of Petrology | Volume 44 | Number 10 | Pages 1727-1757 | 2003
© Oxford University Press 2003; all rights reserved

Synthesis of Staurolite in Melting Experiments of a Natural Metapelite: Consequences for the Phase Relations in Low-Temperature Pelitic Migmatites

ANTONIO GARCÍA-CASCO1,*, FAOUZIYIA HAISSEN2, ANTONIO CASTRO3, HASSAN EL-HMIDI3, RAFAEL LUÍS TORRES-ROLDÁN1 and GUILLERMO MILLÁN4

1 DEPARTAMENTO DE MINERALOGÍA Y PETROLOGÍA, UNIVERSIDAD DE GRANADA, 18002 GRANADA, SPAIN
2 DÉPARTEMENT DE GÉOLOGIE, UNIVERSITÉ CHOUAIB DOUKKALI, B.P. 20 EL JADIDA, MOROCCO
3 DEPARTAMENTO DE GEOLOGÍA, UNIVERSIDAD DE HUELVA, 21819 HUELVA, SPAIN
4 INSTITUTO DE GEOLOGÍA Y PALEONTOLOGÍA, VIA BLANCA Y CARRETERA CENTRAL, HAVANA, CUBA

* Corresponding author. Telephone: +34 958 246613. Fax: +34 958 243368. E-mail: agcasco{at}ugr.es

We document experiments on a natural metapelite in the range 650–775°C, 6–14 kbar, 10 wt % of added water, and 700–850°C, 4–10 kbar, no added water. Staurolite systematically formed in the fluid-present melting experiments above 675°C, but formed only sporadically in the fluid-absent melting experiments. The analysis of textures, phase assemblages, and variation of phase composition and Fe–Mg partitioning with P and T suggests that supersolidus staurolite formed at (near-) equilibrium during fluid-present melting reactions. The experimental results are used to work out the phase relations in the system K2O–Na2O–FeO–MgO–Al2O3–SiO2–H2O appropriate for initial melting of metapelites at the upper amphibolite facies. The P–T grid developed predicts the existence of a stable P–T field for supersolidus staurolite that should be encountered by aluminous Fe-rich metapelites during fluid-present melting at relatively low temperature and intermediate pressures (675–700°C, 6–10 kbar for XH2O = 1, in the KNFMASH system), but not during fluid-absent melting. The implications of these findings for the scarcity of staurolite in migmatites are discussed.

KEY WORDS: metapelites; migmatites; partial melting; P–T grid; staurolite


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