Rosenbaum, G. and Ring, U. 2007.   Structure and metamorphism of Amorgos: a field excursion. In: (Eds.) Gordon S. Lister, M.A. Forster, and Uwe Ring, Inside the Aegean Metamorphic Core Complexes, Journal of the Virtual Explorer, Electronic Edition, ISSN 1441-8142, volume 27, paper 7, doi:10.3809/jvirtex.2007.00181

Structure and metamorphism of Amorgos: a field excursion

Gideon Rosenbaum

Earth Sciences, University of Queensland, Brisbane QLD 4072, Australia. < g.rosenbaum@uq.edu.au>

Uwe Ring

Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand.

Abstract

This field excursion focuses on structural and metamorphic aspects in the island of Amorgos, which is normally considered to represent the stratigraphy of external units in the Hellenides. The excursion includes two itineraries. The first one is in the area northwest of Katapola, where two distinct high-pressure units are exposed. High-pressure mineral assemblages include (1) blue amphibole, garnet and clinopyroxene; and (2) Fe-Mg-carpholite, quartz, phengite and paragonite. The contact between the two units is a low angle detachment fault. The second itinerary starts in the famous monastery of Hozoviotíssas and ends in the northern port of Egiali. The excursion passes through some good examples of folding and provides constraints on the multiple-phase deformation history of the island.

Keywords: Aegean Sea, high-pressure rocks, detachment faulting, Amorgos

Table of Contents

Introduction
Geological setting
Itinerary 1: Blueschists and carpholite-schists northwest of Katapola
Stop 1.1. Flysch (N 36º49’55.1”, E 25º51’41.0”)
Stop 1.2. Conglomerate (N 36º50’14.1”, E 25º51’30.3”)
Stop 1.3. Blueschist-facies rocks (N 36º50’18.7”, E 25º51’21.6”)
Stop 1.4. Carpholite-bearing meta-conglomerate (N 36º50’19.9”, E 25º51’21.2”)
Stop 1.5. The detachment (N 36º50’26.8”, E 25º51’42.1”)
Stop 1.6. Refolded F1 folds in the flysch (N 36º50’33.2”, E 25º51’44.3”)
Stop 1.7 Dolomite (N 36º50’17.8”, E 25º51’05.4”)
Stop 1.8. Albite micaschist (N 36º50’17.2”, E 25º51’00.9”)
Stop 1.9. Large F3 fold (N 36º50’14.6”, E 25º50’26.8”)
Itinerary 2: From Hozoviotíssas Monastery to Egiali
Stop 2.1. Hozoviotíssas Monastery (N 36º49’56.3”, E 25º54’32.9”)
Stop 2.2. F1 folds in the marble (N 36º51’06.8”, E 25º55’25.9”)
Stop 2.3. Interference patterns (N 36º51’44.5”, E 25º56’08.4”)
Stop 2.4. Ronzas Creek (N 36º52’13.6”, E 25º56’12.8”)
Stop 2.5. F1/F2 overprinting relationships (N 36º53’05.1”, E 25º57’47.1”)
Stop 2.6. Potamos
Acknowledgments
References
List of Figures
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