Lyell Collection
Journal of the Geological Society
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by DALLMEYER, R. D.
Right arrow Articles by NEUBAUER, F.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 1994; v. 151; issue.4; p. 591-598;
DOI: 10.1144/gsjgs.151.4.0591
© 1994 Geological Society of London

Article

Cadomian 40Ar/39Ar apparent age spectra of detrital muscovites from the Eastern Alps

R. D. DALLMEYER1 & F. NEUBAUER2

1 Department of Geology, The University of Georgia, Athens, CA 30602, USA
2 Znstitut für Geologie und Paläontologie, Paris-Lodron-Universität, Hellbrunnerstr. 34, A-5020 Salzburg, Austria

Concentrates of detrital muscovite were prepared from the Bischofalm Quartzite (late Ordovician) exposed in the Southalpine Carnic Alps, Austria. Two size fractions (150–175 pm and 85-100 µm) from two samples display similarly discordant 40Ar/39Ar age spectra in which apparent ages systematically increase from c. 300 Ma to c. 600 Ma in low-temperature portions of each analysis. Intermediate- and high-temperature increments are characterized by apparent ages of c. 620–645 Ma. Characteristics of the age spectra suggest minor late Palaeozoic, Variscan or combined Variscan/Alpine rejuvenations of argon isotopic systems within detrital grains which originally crystallized within a late Precambrian source terrain. The detrital muscovite ages provide evidence for a Cadomian-age source region for some basement sequences within the Austroalpine/Southalpine sectors of the Eastern Alps. The occurrence of Cadomian-age detritus in the Eastern Alps suggests links with Armorica and other, similarly aged tectonic elements within Alpine chains initiating along northern margins of Gondwana.




This article has been cited by other articles:


Home page
 Reviews in Mineralogy and GeochemistryHome page
K.V. Hodges, K.W. Ruhl, C.W. Wobus, and M.S. Pringle
40Ar/39Ar Thermochronology of Detrital Minerals
Reviews in Mineralogy and Geochemistry, 2005; 58: 239 - 257.
[Full Text] [PDF]

Home page
 GeologyHome page
Fingerprinting polyorogenic detritus using the 40Ar/39Ar ultraviolet laser microprobe
Geology, 2002; 30: 515 - 518.


Home page
 Geological Society, London, Special PublicationsHome page
J. Tait, M. Schatz, V. Bachtadse, and H. Soffel
Palaeomagnetism and Palaeozoic palaeogeography of Gondwana and European terranes
Geological Society, London, Special Publications, 2000; 179: 21 - 34.
[Abstract] [PDF]