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40Ar/39Ar age constraints for an early Alpine metamorphism of the Sakar unit, Sakar–Strandzha zone, Bulgaria

Published online by Cambridge University Press:  14 September 2020

Nikolay Bonev Open the ORCID record for Nikolay Bonev [Opens in a new window] ,
Richard Spikings  and
Robert Moritz
Nikolay Bonev*
Affiliation:
Department of Geology, Paleontology and Fossil Fuels, Sofia University “St Kliment Ohridski”, 1504Sofia, Bulgaria
Richard Spikings
Affiliation:
Department of Earth Sciences, University of Geneva, CH-1205Geneva, Switzerland
Robert Moritz
Affiliation:
Department of Earth Sciences, University of Geneva, CH-1205Geneva, Switzerland
*
Author for correspondence: Nikolay Bonev, E-mail: niki@gea.uni-sofia.bg
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Abstract

We investigated the Sakar unit metamorphic rocks of the Sakar–Strandzha zone in Bulgaria, using 40Ar/39Ar dating of amphibole from the polymetamorphic basement and white mica in the overlying upper Permian metasedimentary rocks of the Paleokastro Formation. The amphibole and white mica revealed plateau ages of 140.50 ± 1.75 Ma and 126.19 ± 1.29 Ma, respectively, indicating an Early Cretaceous cooling history of the regional amphibolite-facies metamorphism to greenschist-facies conditions. Similar metamorphic grades and cooling histories of the Sakar unit share evidence with the nearby Rhodope Massif for the northern Aegean region-wide early Alpine tectonometamorphic event.

Keywords

40Ar/39Ar geochronologySakar–Strandzha zoneBulgaria
Type
Rapid Communication
Information
Geological Magazine , Volume 157 , Issue 12 , December 2020 , pp. 2106 - 2112
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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