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Coupled phengite 40Ar–39Ar geochronology and thermobarometry: P-T-t evolution of Andros Island (Cyclades, Greece)

Published online by Cambridge University Press:  21 November 2014

BENJAMIN HUET ,
LOÏC LABROUSSE ,
PATRICK MONIÉ ,
BENJAMIN MALVOISIN  and
LAURENT JOLIVET
BENJAMIN HUET*
Affiliation:
Department of Geodynamics and Sedimentology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
LOÏC LABROUSSE
Affiliation:
UPMC Université Paris 06, UMR 7193, ISTeP, 4 place Jussieu, 75252 Paris cedex 05, France CNRS, UMR 7193, ISTeP, 4 place Jussieu, 75252 Paris cedex 05, France
PATRICK MONIÉ
Affiliation:
Géosciences Montpellier, UMR 5573, Université Montpellier 2, France
BENJAMIN MALVOISIN
Affiliation:
Faculté des Géosciences et de l’Environnement, Université de Lausanne, Switzerland
LAURENT JOLIVET
Affiliation:
Université d’Orléans, ISTO, UMR 7327, 42071, Orléans, France CNRS/INSU, ISTO, UMR 7327, 42071, Orléans, France BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France
*
†Author for correspondence: [email protected]
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Abstract

Andros is a key island for understanding both the timing of high-pressure–low-temperature (HP-LT) metamorphism and the dynamics of crustal-scale detachment systems exhuming high-grade units in the Cyclades (Greece). Using phengite 40Ar–39Ar geochronology coupled with thermobarometry, as well as data from literature, we constrain the pressure–temperature–time (P-T-t) paths of the Makrotantalon and Attic–Cycladic Blueschist units on Andros. Peak conditions of the HP-LT episode in the Makrotantalon unit are 550°C and 18.5 kbar, dated at 116 Ma. We correlate this episode with Early Cretaceous blueschist facies metamorphism recognized in the Pelagonian zone of continental Greece. This is a new argument favouring a Pelagonian origin for the Makrotantalon unit. In the Attic–Cycladic Blueschist unit, the P-T-t path is characterized by: (1) exhumation after peak conditions in HP-LT conditions between 55 and 35 Ma; (2) isobaric heating at 7 kbar until 30 Ma; and (3) isothermal decompression until 21 Ma. This thermal evolution and timing are similar to those of the neighbouring Tinos Island, emphasizing major thermal re-equilibration at the transition between stable and retreating subduction. Modifications of the crustal thermal state played a major role in the evolution of the North Cycladic Detachment System, below which Andros HP-LT units were exhumed.

Keywords

P-T-t pathblueschistHP-LT metamorphismAegeandetachmentssubduction
Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 4 , July 2015 , pp. 711 - 727
Copyright
Copyright © Cambridge University Press 2014 

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