Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/13613
Citations
Scopus Web of Science® Altmetric
?
?
Full metadata record
DC FieldValueLanguage
dc.contributor.authorFoden, J.en
dc.contributor.authorSandiford, M.en
dc.contributor.authorDougherty-Page, J.en
dc.contributor.authorWilliams, I.en
dc.date.issued1999en
dc.identifier.citationAustralian Journal of Earth Sciences, 1999; 46(3):377-389en
dc.identifier.issn0812-0099en
dc.identifier.issn1440-0952en
dc.identifier.urihttp://hdl.handle.net/2440/13613-
dc.description.abstractThe Rathjen Gneiss is the oldest and structurally most complex of the granitic intrusives in the southern Adelaide Fold-Thrust Belt and therefore provides an important constraint on the timing of the Delamerian Orogen. Zircons in the Rathjen Gneiss show a complex growth history, reflecting inheritance, magmatic crystallisation and metamorphism. Both single zircon evaporation ('Kober' technique) and SHRIMP analysis yield best estimates of igneous crystallisation of 514 ± 5 Ma, substantially older than other known felsic intrusive ages in the southern Adelaide Fold-Thrust Belt. This age places an older limit on the start of the Delamerian metamorphism and is compatible with known stratigraphic constraints suggesting the Early Cambrian Kanmantoo Group was deposited, buried and heated in less than 20 million years. High-U overgrowths on zircons were formed during subsequent metamorphism and yield a ²⁰⁶Pb/²³⁸U age of 503 ± 7 Ma. The Delamerian Orogeny lasted no more than 35 million years. The emplacement of the Rathjen Gneiss as a pre- or early syntectonic granite is emphasised by its geochemical characteristics, which show affiliations with within-plate or anorogenic granites. In contrast, younger syntectonic granites in the southern Adelaide Fold-Thrust Belt have geochemical characteristics more typical of granites in convergent orogens. The Early Ordovician post-tectonic granites then mark a return to anorogenic compositions. The sensitivity of granite chemistry to changes in tectonic processes is remarkable and clearly reflects changes in the contribution of crust and mantle sources.en
dc.language.isoenen
dc.publisherTaylor & Francisen
dc.subjectAdelaide Fold-Thrust Belt; Delamerian Orogeny; granite; radiometric dating; Rathjen Gneissen
dc.titleThe Geochemistry and Geochronology of the Rathjen Gneiss: implications for the early tectonic evolution of the Delamerian Orogen.en
dc.typeJournal articleen
dc.identifier.rmid0030003654en
dc.identifier.doi10.1046/j.1440-0952.1999.00712.xen
dc.identifier.pubid67660-
pubs.library.collectionGeology & Geophysics publicationsen
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidFoden, J. [0000-0003-3564-7253]en
Appears in Collections:Geology & Geophysics publications

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.