Cadomian magmatism in the Alps recorded in Late Ordovician sandstones of the Carnic Alps: Preliminary results from zircon Pb/Pb evaporation dating
- Autor(en)
- Franz M. Neubauer, Urs Kloetzli, P. Poscheschnik
- Abstrakt
207Pb/206Pb evaporation age dating of euhedral detrital zircons from the Late Ordovician Uggwa Formation, eastern Carnic Alps, yields two age groups, including (1) a group with a pooled age of 650 ± 24 Ma and (2) a bad constrained age group of 518 ± 76 to 533 ± 106 Ma. The younger age group is similar to acidic orthogneisses of the Austroalpine basement complex. The older ages coincide with 40 Ar/39 Ar ages of detrital white mica from the same stratigraphic level, and suggest together with mica ages, therefore, the presence of a Cadomian metamorphic/magmatic orogenic belt. We interpret the new zircon ages to record two stages of magmatism related to Late Cadomian tectonic events. Ages of inherited zircon cores include apparent minimum ages ranging from c. 2.0 Ga to c. 900 Ma displaying possible close paleogeographic relationships with Gondwanan and/or Baltic tectonic elements
- Organisation(en)
- Department für Lithosphärenforschung
- Externe Organisation(en)
- Paris-Lodron Universität Salzburg
- Journal
- Schweizerische Mineralogische und Petrographische Mitteilungen: eine europäische Zeitschrift für Mineralogie, Geochemie und Petrographie
- Band
- 81
- Seiten
- 175-179
- Anzahl der Seiten
- 5
- ISSN
- 0036-7699
- Publikationsdatum
- 2001
- Peer-reviewed
- Ja
- ÖFOS 2012
- 1051 Geologie, Mineralogie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/4e18ab19-d3dd-41b4-9582-64fabf541d1f