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European Journal of Mineralogy; January, February 2001; v. 13; no. 1; p. 57-66; DOI: 10.1127/0935-1221/01/0013-0057
© 2001 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Cambro-Ordovician age of a metagabbro from the Wildschönau ophiolite complex, Greywacke Supergroup (Eastern Alps, Austria)

: A U-Pb SHRIMP study Georg LOTH*,1, Roland EICHHORN**, Rudolf HÖLL*, Allen KENNEDY***, Peter SCHAUDER* and Frank SÖLLNER*

* Institut für Allgemeine und Angewandte Geologie, Ludwig-Maximilians-Universität München, Luisenstr. 37, D-80333 München, Germany
** Bayerisches Geologisches Landesamt, Heßstr. 128, D-80797 München, Germany
*** Curtin University of Technology, GPO Box U 1987, Perth 6001, Western Australia

1 e-mail: Georg.Loth{at}iaag.geo.uni-muenchen.de

The Wildschönau ophiolite complex represents the lowermost and probably oldest rock unit of the western part of the Greywacke Supergroup. Within this ophiolite complex, zircon grains from a metamorphosec gabbro yield a U-Pb SHRIMP age of 477±9 Ma (2{sigma}), interpreted as age of crystallization. This age reflects the magmatic activity in Cambro-Ordovician times and is probably related to a continental rift environment during breakup of Gondwana. The 477±9 Ma age is a few m.y. younger than oldest ages estimated from biostratigraphy; reasons for this difference are evaluated.

Key-words: zircon, SHRIMP, U-Pb dating, Austroalpine, ophiolite, Austria.






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