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|Title:||The geology of Ewarara Intrusion, Giles Complex, Central Australia.|
|Author:||Goode, A. D. T.|
Krieg, G. W.
|School/Discipline:||School of Earth and Environmental Sciences, Geology & Geophysics|
|Abstract:||Ewarara Intrusion is a layered ultramafic body which shows the initial stages of a differentiation trend similar to the Mt. Davies Intrusion. It is essentially a flat lopolithic sheet with usually a steep southern contact where the fissures and/or pipes of intrusion are possibly located. It consists of an olivine pyroxenite (Lower Layer) and a thicker pyroxenite (Upper Layer), together giving a visible stratigraphic thickness of about 500 to 600 feet. There appears to be a marked hiatus between deposition of the layers, possibly due to convectional overturn or, less likely, a fresh influx of magma. Both vertical and horizontal bandings are observed, and are not structurally related. They were possibly formed by viscous flow in vertical planes and by gravitational settling respectively. Current action is indicated in some cases by lineated textures. Both chilled and hybrid contacts are observed, the latter being more common. Contamination near the contacts is usual. Smaller intrusions near the main body can be represented usually as plagioclase-rich variations of the two main rock types. The first reported occurrence of Giles Complex dykes is noted. An anorthosite body occurs discontinuously along a large shear to the north-west. This shear continues as crush zone through the main body, dividing it into two lobes. The metamorphic country rock consists predominantly of gneisses which maintain a reasonably constant attitude. They belong to the pyroxene granulite facies, both orthopyroxene-plagioclase and clnopyroxene-almandine subfacies assemblages being represented. Post intrusive dolerite dyke-shear swarms crosscut the whole area.|
|Dissertation Note:||Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1965|
|Where:||Giles Complex, Musgrave Ranges, Central Australia|
|Keywords:||Honours; Geology; Giles Complex; ultramafic intrusions; granulite facies metamorphism|
|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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|01frontGeoHon.pdf||Title page, Abstract & Contents||111.14 kB||Adobe PDF||View/Open|
|02wholeGeoHon.pdf||Whole thesis (as available)||8.7 MB||Adobe PDF||View/Open|
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