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dc.contributor.authorMadigan, T. L. A.-
dc.coverage.spatialKanmantoo Trough, Adelaide Fold Belt, eastern Mt Lofty Ranges, South Australia-
dc.descriptionThis item is only available electronically.en
dc.description.abstractThe Rathjen gneiss in the vicinity of Springton in the Mount Lofty Ranges is shown to be fundamentally important to our understanding of the metamorphic and deformational history of the Southern Adelaide Foldbelt. Field and geochemical criteria are used to prove conclusively that the Rathjen gneiss is a metamorphosed intrusive. A prominent N-S trending stretching lineation particularly well developed in the Rathjen Gneiss indicates previously unrecognized N-S tectonic transport early in the history of the Delamerian Orogeny. Amphibole-plagioclase equilibria in the mapped area indicate metamorphic conditions (- 700°C, < 5 kbars) consistent with the results of studies in nearby areas (e.g. Sandiford et al., in press), although the errors associated with these constraints are large and therefore the comparison tenuous. These temperatures are clearly in excess of those expected to be reached by crustal thickening and erosion and require some other heat source. Evidence of magmatic activity is abundant in the area with the Rathjen Gneiss; a previously unidentified gabbronorite and leucogabbro, and amphibolite dykes all being capable of supplying additional heat to the area through various stages of the metamorphic history.en
dc.subjectHonours; Geology; Rathjen Gneiss; metamorphism; deformation; magmatism; Delamerian Orogeny; Adelaide Fold Belt; orogenesisen
dc.titleThe Rathjen Gneiss: constraints on the tectonic history of the Kanmantoo Group around Springton, South Australiaen
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, 1988-
Appears in Collections:School of Physical Sciences

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