Cambro-Ordovician age of a metagabbro from the Wildschonau ophiolite complex, Greywacke Supergroup (Eastern Alps, Austria): A U-Pb SHRIMP study
2001; Elsevier BV; Volume: 13; Issue: 1 Linguagem: Inglês
10.1127/0935-1221/01/0013-0057
ISSN1617-4011
AutoresGeorg Loth, Roland Eichhorn, R.M. van der Zee Holl, Allen Kennedy, P. Schauder, Frank Söllner,
Tópico(s)Geochemistry and Elemental Analysis
ResumoThe Wildschonau 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 (2σ), 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.
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