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Type: Thesis
Title: Investigating a mantle source for Central Australian high heat producing granites
Author: Hopkinson, J. A.
Issue Date: 2015
School/Discipline: School of Physical Sciences
Abstract: The Arunta Region of Australia is a region of high heat flow, largely attributed to an abundance of heat producing elements. High heat producing Proterozoic granites found in the Anmatjira Range in Central Australia have close spatial relationships with mafic rock units. This paper uses field relations, geochemistry, geochronology and isotopic nature of mafic rocks observed in the Range, as well as the Arunta Region, to investigate a possible mantle source for the generation of a fractionation series including the high heat producing granites. Using U–Pb zircon geochronology the Possum Creek Charnockite and Tyson Creek Granulite were dated at 1795.4 ± 4.9 Ma and 1779.9 ± 4.9 Ma respectively. These data as well as field relationships are used to infer that the mafic rock units were interacting coevally with the granites and were intruded during the same tectonic events, the 1820-1795 Ma Stafford and 1790-1770 Ma Yambah Events. Geochemical results of high Cr and Ni concentrations with low SiO2 contents characterised the rocks as mafic and ratios of LILE and HFSE suggests some form of enrichment of the source. Geochemistry implicates a subduction tectonic setting that produced dehydration metasomatism of the overlying mantle wedge. εNd values of -1.8 to -4.7 infer crustal contamination but coupled with the mafic nature of the units further implies a modified and enriched mantle source. It has been interpreted that a subduction related dehydration metasomatism event occurred to enrich the mantle source region which then interacted with crustally derived melts to form a fractionation series including both mafic rock units sampled in this work as well as the high heat producing granites of interest.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015
Where: Aileron Province, North Australian Craton
Keywords: Honours; Geology; heat production; Central Australia; Anmatjira Range; mantle enrichment; geochemistry; isotope geochemistry
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:
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