I and S-type Plutonism on Serifos (W-Cyclades, Greece)

Autor(en)

Christoph Iglseder, Bernhard Grasemann, David A. Schneider, Konstantin Petrakakis, Christine Miller, Urs Kloetzli, Martin Thöni, Andras Zamolyi, Christian Rambousek

Abstrakt

Tertiary I- and S-type plutonism are widespread in the Aegean region and frequently associated with extensional tectonic structures. This investigation presents the first evidence of protracted magmatism on the island of Serifos in the western Cyclades and at least two discrete generations of plutonism and coeval dyke generations can be distinguished: (1) An older granitoid with S-type characteristics intruded the Attic-Cycladic crystalline rocks. The granitoid and its host rocks were mylonitized by an earlier phase of deformation at temperature conditions > ~450°C and WSW directed shear. This crustal scale ductile shear zone has been reactivated during the initial stage of a metamorphic core complex formation recording top-SSW sense of shear. Rb-Sr muscovite data from the orthogneiss yield cooling, respectively deformation ages of 15-11.3 Ma. (2) An I-type hornblende-biotite-granodiorite pluton with dacitic to andesitic dyke generations intruded syn- to post-kinematically during ongoing extensional deformation at shallow crustal levels. Single grain zircon TIMS U-Pb ages of the main granodiorite body and its associated dykes are 11.6-9.5 Ma. Cooling ages of these samples scatter between 8.5-7.7 Ma (Rb-Sr on biotite).

Organisation(en)

Institut für Geologie, Department für Lithosphärenforschung

Externe Organisation(en)

University of Ottawa, Leopold-Franzens-Universität Innsbruck

Journal

Tectonophysics

Band

473

Seiten

69-83

Anzahl der Seiten

15

ISSN

0040-1951

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

105119 Petrographie, 105105 Geochemie, 105106 Geodynamik, 105101 Allgemeine Geologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/37baa257-15a5-42e1-829a-c6c56f494428