期刊
JOURNAL OF STRUCTURAL GEOLOGY
卷 26, 期 8, 页码 1433-1445出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2003.11.027
关键词
Cyclades; Syros Island; high-pressure metamorphism; tectonic history; ductile deformation; brittle deformation
New data obtained during re-mapping of the northern part of Syros (Cyclades, Greece) allow the refinement of existing concepts about the structural evolution of this island. A metabasite belt and its metasedimentary envelope near Kampos and San Michali were mapped at a 1:5000 scale, with special emphasis on the structural inventory. The HP/LT rocks (P similar to 1.5 GPa; T similar to 500 degreesC at similar to50 Ma) exposed are intensely deformed by at least two isoclinal folding events. Relative age relations between deformation and peak metamorphism indicate that isoclinal folding took place before or during peak metamorphism. Later deformation stages include Miocene non-penetrative upright kink folding and crenulation, transpressional strike-slip faulting, and open upright cylindrical folding, followed by the development of steep normal faults. Taking into account recent zircon U-Pb geochronological constraints, lithostratigraphic observations, and published data on the Neogene structural evolution of the Aegean, we present a history for the rocks of Syros, beginning with the formation of the oceanic crust (represented by the metabasites) to the present. (C) 2004 Elsevier Ltd. All rights reserved.
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