Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/121355
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dc.contributor.authorWeiss, S.-
dc.coverage.spatialArunta Complex, central Australia-
dc.date.issued2016-
dc.identifier.urihttp://hdl.handle.net/2440/121355-
dc.descriptionThis item is only available electronically.en
dc.description.abstractThe Arunta Region of Central Australia contains Paleoproterozoic granites extremely enriched in high heat producing elements, in comparison to a global upper crustal average of 1.69 μWm-3. This study uses geochemistry, geochronology, and zircon saturation thermometry to investigate the source and tectonic environment of emplacement of the ca. 1780 Ma Napperby Gneiss. The Napperby Gneiss is peraluminous, suggesting a metasedimentary source. Samples have negative Eu anomalies ranging from 0.10 to 0.57, and show further evidence of fractionation in negative correlations of Ba and Sr with increasing SiO2. Initial εNd values are similar to surrounding exposed metasedimentary rocks and suggest a strong influence of an evolved crustal source but indicate a necessary juvenile component. Matches of inherited xenocrystic zircons from the gneiss with detrital patterns from the regional metasedimentary Lander Formation indicate that sediments similar to the Lander Formation are the source of the protolith granite. Zircon saturation temperatures suggest the granites were emplaced at 790°C – 872°C. Heat production is less than the slightly older ca 1800 ma suites of the Aileron province, and zircon saturation temperatures are higher. The Napperby was produced by dehydration melting rather than fluid flux melting, possibly in a back arc extensional environment with heat provided by upwelling mantle.en
dc.language.isoenen
dc.subjectHonours; Geology; high heat producing; geochemistry; Central Australia; zircon saturation thermometry; Reynolds Ranges; Arunta Complex; Aileron Province; Napperby Gneissen
dc.titleConstraints on the origin of the ca 1780 Ma high heat producing Napperby Gneiss, Aileron Province, Central Australiaen
dc.typeThesisen
dc.contributor.schoolSchool of Physical Sciencesen
dc.provenanceThis electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the author of this thesis and do not wish it to be made publicly available, or you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legalsen
dc.description.dissertationThesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2016-
Appears in Collections:School of Physical Sciences

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