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dc.contributor.authorMartin, N. H.-
dc.coverage.spatialKanmantoo Trough, Adelaide Fold Belt, eastern Mt Lofty Ranges, South Australia-
dc.descriptionThis item is only available electronically.en
dc.description.abstractPeak metamorphic growth in high temperature - low pressure terrains is commonly associated with crustal thickening strains reflected in syn-tectonic fabrics. Conductive heat transfer through the lithosphere for geologically plausible thermal and mechanical configurations is unable to produce such temperatures and thus an advective thermal perturbation is required, and is commonly in the form of granitic melts. Thermal weakening of the lithosphere as a consequence of this advective heat allows the potential for crustal thickening strain increments. In this thesis a coupled thermo-mechanical model is presented which allows quantification of this thermal weakening effect. Two granite generation models are investigated; firstly, lower crustal melting due to conductive heating of the lithosphere during orogenesis and secondly, segregation or roof rock melting from mafic sills located at the base of the crust. Results from the model indicate that, for granites produced by melting of the lower crust, crustal thickening strains increments are only in the order of 5 -10 %. However, for granites produced by segregation from a mafic sill crustal strain increments of up to 30% may occur during emplacement. Thus, in order to produce peak metamorphic temperatures associated with significant crustal strain a system analogous to the second model is required. Structural and metamorphic studies of the Palmer region in the southern Adelaide Fold Belt reveal the associated development of partial melting and peak metamorphism with the intrusion of the orthogneissic Rathjen Gneiss during the regional D1 folding event. Thermal weakening triggered by the Rathjen Gneiss has produced a local D2 folding event. Areas at some distance from the Rathjen Gneiss exhibit peak metamorphic growth during D2 consistant with the delayed peak temperatures from the cooling body.en
dc.subjectHonours; Geology; metamorphism; tectonics; granite generation; thermo-mechanical model; Adelaide Fold Belt; orogenesisen
dc.titleA coupled thermo-mechanical model for deformation in high temperature-low pressure metamorphic terrains: implications for the Palmer region, southern Adelaide Fold Belten
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:
dc.description.dissertationThesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1990-
Appears in Collections:School of Physical Sciences

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