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Metamorphism and diachronous cooling in a contractional orogen: the Strandja Massif, NW Turkey

Published online by Cambridge University Press:  19 January 2011

G. SUNAL ,
M. SATIR ,
B. A. NATAL'IN ,
G. TOPUZ  and
O. VONDERSCHMIDT
G. SUNAL*
Affiliation:
Universität Tübingen, Institut für Geowissenschaften, Wilhelmstrasse 56, D-72074 Tübingen, Germany İstanbul Teknik Üniversitesi, Jeoloji Mühendisliği Bölümü, TR-34469 Maslak, Istanbul, Turkey
M. SATIR
Affiliation:
Universität Tübingen, Institut für Geowissenschaften, Wilhelmstrasse 56, D-72074 Tübingen, Germany
B. A. NATAL'IN
Affiliation:
İstanbul Teknik Üniversitesi, Jeoloji Mühendisliği Bölümü, TR-34469 Maslak, Istanbul, Turkey
G. TOPUZ
Affiliation:
İstanbul Teknik Üniversitesi, Avrasya Yerbilimleri Enstitüsü, TR-34469 Maslak, Istanbul, Turkey
O. VONDERSCHMIDT
Affiliation:
Universität Tübingen, Institut für Geowissenschaften, Wilhelmstrasse 56, D-72074 Tübingen, Germany
*
†Author for correspondence: [email protected]
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Abstract

The southern part of the Strandja Massif, northern Thrace, Turkey, comprises a basement of various gneisses, micaschists and rare amphibolite, and a cover of metaconglomerate and metasandstone, separated from each other by a pre-metamorphic unconformity. Metamorphic grade decreases from the epidote–amphibolite facies in the south to the albite–epidote–amphibolite/greenschist-facies transition in the north. Estimated P–T conditions are 485–530°C and 0.60–0.80 GPa in the epidote–amphibolite facies domain, and decrease towards the transitional domain between greenschist- and epidote–amphibolite facies. Rb–Sr muscovite ages range from 162.9 ± 1.6 Ma to 149.1 ± 2.1 Ma, and are significantly older (279–296 Ma) in the northernmost part of the study area. The Rb–Sr biotite ages decrease from 153.9 ± 1.5 Ma in the south to 134.4 ± 1.3 Ma in the north. These age values in conjunction with the attained temperatures suggest that the peak metamorphism occurred at around 160 Ma and cooling happened diachronously, and Rb–Sr muscovite ages were not reset during the metamorphism in the northernmost part. Structural features such as (i) consistent S-dipping foliation and SW to SE-plunging stretching lineation, (ii) top-to-the-N shear sense, and (iii) N-vergent ductile shear zones and brittle thrusts suggest a N-vergent compressional deformation coupled with exhumation. We tentatively ascribe this metamorphism and subsequent diachronous cooling to the northward propagation of a thrust slice. The compressional events in the Strandja Massif were most probably related to the coeval N-vergent subduction/collision system in the southerly lying Rhodope Massif.

Keywords

P–T estimatesRb–Sr datingmetamorphism and diachronous coolingcompressional exhumationStrandja MassifTurkey
Type
Original Article
Information
Geological Magazine , Volume 148 , Issue 4 , July 2011 , pp. 580 - 596
Copyright
Copyright © Cambridge University Press 2011

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