Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/114328
Type: Thesis
Title: Isotopic and geochemical characteristics of the British Empire Granite as indicators of magma provenance and processes of melt generation in the Mount Painter Inlier, South Australia
Author: Neumann, N. L.
Issue Date: 1996
School/Discipline: School of Physical Sciences
Abstract: The production of granitic magmas at shallow to midcrustal depths by anatexis of crustal material requires a significant thermal perturbation of the normal crustal geothermal regime. Thermal perturbations leading to anatexis may be initiated by crustal thickening associated with deformation, intrusion and/or upwelling of heat sources from lower crust or mantle regions or by anomalous concentrations of heat-producing elements, U, Th and K. This thesis explores the origin of shallow to mid-crustal peraluminous granites within the Mount Painter Inlier, together with their relationship to older granite suites, as indicators of magmatic processes during crustal deformation of the Delamerian Orogeny. The geochemical and isotopic characteristics of granites and gneisses of the Mount Painter Inlier indicate two distinct periods of granitic evolution involving different source regions and magmatic processes. Proterozoic granites and gneisses reflect magmatic sources and processes similar to those involved in the evolution of other Australian anorogenic Proterozoic terrains, although extreme concentrations of U, Th and K suggest an important role for element concentration within accessory minerals during granite genesis. Field relationships, together with geochemical and isotopic characteristics of the Palaeozoic(?) British Empire Granite indicate evolution from a complex mixture of surrounding metasediments and granites in a number of possible scenarios. The additional thermal energy required to produce the British Empire Granite from partial melting of this package at depths of approximately 12 to 15 km is consistent with perturbed thermal regimes resulting from anomalous internal heat production due to the extreme concentration of U, Th and K within the Proterozoic units.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1996
Where: Mount Painter Inlier, Curnamona Province, South Australia
Keywords: Honours; Geology; geochronology; isotope geochemistry; granites; Mount Painter Inlier; provenance
Description: This item is only available electronically.
Provenance: This 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/legals
Appears in Collections:School of Physical Sciences

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