U-Pb and Ar-Ar geochronological data from the Pelagonian basement in Evia (Greece): geodynamic implications for the evolution of Paleotethys

Details

Serval ID
serval:BIB_360F1F10B61D
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
U-Pb and Ar-Ar geochronological data from the Pelagonian basement in Evia (Greece): geodynamic implications for the evolution of Paleotethys
Journal
Schweizerische Mineralogische und Petrographische Mitteilungen
Author(s)
Vavassis I., De Bono A., Stampfli G.M., Giorgis D., Valloton A., Amelin Y.
ISSN-L
0036-7699
Publication state
Published
Issued date
2000
Peer-reviewed
Oui
Volume
80
Pages
21-43
Language
english
Abstract
High precision U-Pb zircon and Ar-40/Ar-39 mica geochronological data on
metagranodiorites, metagranites and mica schists from north and central
Evia island (Greece) are presented in this study. U-Pb zircon ages range
from 308 to 1912 Ma, and indicate a prolonged magmatic activity in Late
Carboniferous. Proterozoic ages represent inherited cores within younger
crystals. Muscovite Ar-40/Ar-39 plateau ages of 288 to 297 Ma are
interpreted as cooling ages of the magmatic bodies and metamorphic host
rocks in upper greenschist to epidote-amphibolite metamorphic
conditions. The multistage magmatism had a duration between 308 and 319
hla but some older intrusions, as well as metamorphic events, cannot be
excluded. Geochemical analyses and zircon typology indicate
calc-alkaline affinities for the granites of central Evia and alkaline
to calc-alkaline characteristics for the metagranodiorites from the
northern part of the island. The new data point towards the SE
continuation, in Evia and the Cyclades, of a Variscan continental crust
already recognised in northern Greece (Pelagonian basement). The Late
Carboniferous magmatism is viewed as a result of northward subduction of
the Paleotethys under the Eurasian margin.
Create date
20/10/2012 18:11
Last modification date
20/08/2019 13:23
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