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Geochemistry and tectonic significance of augen gneisses from the southern Menderes Massif (West Turkey)

Published online by Cambridge University Press:  01 May 2009

E. Bozkurt ,
J. A. Winchester  and
R. G. Park
E. Bozkurt
Affiliation:
Ankara University, Science Faculty, Geological Engineering Department, 06100 Tandoğan-Ankara, Turkey
J. A. Winchester
Affiliation:
Geology Department, Keele University, Staffordshire ST5 5BG, UK
R. G. Park
Affiliation:
Geology Department, Keele University, Staffordshire ST5 5BG, UK
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Abstract

The protoliths of mylonitized augen gneisses exposed in the southern sector of the Menderes Massif (West Turkey) are calc-alkaline, peraluminous, S-type, late- to post-tectonic tourmaline- and garnet-bearing, two-mica leucogranites. They cut and post-date the fabrics of the ‘main Menderes metamorphism’ which took place between the early Eocene and early Oligocene and intrude metamorphic basement rocks comprising the so-called ‘Palaeozoic schist envelope’ of the massif. They are themselves cut by an extensive network of tourmaline-rich dykes. Chemical, mineralogical, isotopic and field relations suggest that the granitic protolith crystallized from a boron-rich, water-saturated melt, derived from partial melting of metagreywacke in the lower crust during peak Barrovian-type metamorphism. The protolith was probably emplaced during lateorogenic extensional collapse of the thickened crust in west Turkey during late Oligocene time.

Type
Articles
Information
Geological Magazine , Volume 132 , Issue 3 , May 1995 , pp. 287 - 301
Copyright
Copyright © Cambridge University Press 1995

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