Skip to Main content Skip to Navigation
New interface
Journal articles

The Ikaria high-temperature Metamorphic Core Complex (Cyclades, Greece): Geometry, kinematics and thermal structure

Abstract : This work attempted at clarifying the structure of Ikaria using primarily intensive geological mapping combined with structural analysis and a geothermometry approach of Raman spectrometry of carbonaceous material. Foliation over the whole island defines a structural dome cored by high-grade to partially-molten rocks. Its exhumation was completed by two top-to-the-N ductile extensional shear zones, operating in the ductile and then the brittle fields, through a single extensional event coeval with progressive strain localization. The thermal structure of the dome with regard to position of ductile shear zones was retrieved using the Raman spectroscopy of carbonaceous material. Peak-metamorphic temperatures range from 390 °C in the upper parts of the structure down to 625 °C in the core of the dome in the vicinity of migmatites and S-type granite. Pioneer in situ U-Th-Pb analyses on monazite performed on the leucosome parts of these rock yielded a 15.7 ± 0.2 Ma age. Ikaria Island thus completes the series of Miocene migmatite-cored Metamorphic Core Complex in the central part of the Aegean domain where a genuine high-temperature zone can be defined as the central Aegean HT zone. There, the extreme stretching of the continental crust is associated with dominantly top-to-the-N kinematics.
Complete list of metadata

Cited literature [35 references]  Display  Hide  Download
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, November 6, 2015 - 10:43:09 AM
Last modification on : Wednesday, August 3, 2022 - 4:03:20 AM
Long-term archiving on: : Monday, February 8, 2016 - 12:47:14 PM


Files produced by the author(s)


Distributed under a Creative Commons Attribution - NoDerivatives 4.0 International License



Alexandre Beaudoin, Romain Augier, Valentin Laurent, Laurent Jolivet, Abdeltif Lahfid, et al.. The Ikaria high-temperature Metamorphic Core Complex (Cyclades, Greece): Geometry, kinematics and thermal structure. Journal of Geodynamics, 2015, 92, pp.18-41. ⟨10.1016/j.jog.2015.09.004⟩. ⟨insu-01225362⟩



Record views


Files downloads