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Journal of the Geological Society; 2007; v. 164; issue.2; p. 425-438;
DOI: 10.1144/0016-76492006-005
© 2007 Geological Society of London

Original Article

Tectonometamorphic evolution of high-pressure rocks from the island of Amorgos (Central Aegean, Greece)

Gideon Rosenbaum1, Uwe Ring2 & Alexander Kühn3

1 1Department of Earth Sciences, University of Queensland, Brisbane, QLD 4072, Australia (e-mail: g.rosenbaum@uq.edu.au)
2 2Department of Geological Sciences, University of Canterbury, Christchurch 8004, New Zealand
3 3Institut für Geowissenschaften, Johannes Gutenberg Universität, Mainz 55099, Germany

Structural and metamorphic data from the island of Amorgos (central Aegean Sea) show evidence for the existence of two distinct high-pressure units, the Metabasite Unit and the Basal Conglomerate Unit. These are exposed at the base of a thick marble sequence and overlying flysch deposits. The Metabasite Unit is characterized by a mineral assemblage of blue amphibole, garnet and clinopyroxene, indicating P–T conditions of 500–600 °C and >13 kbar. It is juxtaposed below carpholite-bearing metaconglomerates and quartz-rich micaschists of the Basal Conglomerate Unit, for which metamorphic conditions of 300–450 °C and 10–14 kbar are estimated. The contact between the two units is interpreted as a low-angle detachment fault that accommodated top-to-the-NW sense of motion. The Amorgos succession above the Basal Conglomerate Unit collectively resembles the stratigraphy of external units in the Hellenides and could possibly be correlated with the so-called ‘Basal Unit’, which crops out in a number of tectonic windows throughout the Aegean Sea. This means that the Metabasite Unit in Amorgos could possibly represent the lowermost structural unit in the central Aegean Sea.




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U. RING and C. KUMERICS
Vertical ductile thinning and its contribution to the exhumation of high-pressure rocks: the Cycladic blueschist unit in the Aegean
Journal of the Geological Society, 2008; 165: 1019 - 1030.
[Abstract] [Full Text] [PDF]