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Type: Thesis
Title: The structural evolution of the Bull Creek area, southern Adelaide fold belt, South Australia; through the integration of geological mapping and geophysical interpretation
Author: Saunders, P. J.
Issue Date: 1993
School/Discipline: School of Earth and Environmental Sciences
Abstract: Integration of a high resolution aeromagnetic survey with detailed structural field data has been achieved in the Bull Creek area of the southern Adelaide Fold Belt, resulting in a comprehensive model for the structural evolution of this area. Aeromagnetic data has placed constraints upon structures mapped at the surface and has also revealed information concerning the nature of structures at depth. The successful interpretation of data is due to the good lithomagnetic marker horizons within the area. These horizons include the magnetic Barossa Complex basement and lithomagnetic units of the Adelaide Supergroup and Kanmantoo Group metasediments. The Brachina Formation, an important magnetic marker horizon of the Adelaide Supergroup, lies at depth (due to thrust related tear-faulting) beneath a magnetic cover of Backstairs Passage Formation of the Kanmantoo Group sediments. Geophysical images and contour maps reveal the location and intensity of important magnetic and radiometric anomalies which constrain the interpretation of mapped structures. Modelling of individual magnetic profiles places constraints on the depth to the top, the width, dip and susceptibility of magnetic bodies. Vertical gradient filtering enhances the edges of two dimensional sources and Automated Gains Control filtering amplifies the effects of small anomalies. A model suggesting multiple sequential thrusting has been devised for the Bull Creek area. This model incorporates a basal decollement located within the basement (4-5 km beneath the present erosion level) which has transported a sliver of basement complex to the surface where it forms a hanging wall anticline. An upper detachment has formed near the basement - cover contact within the basal unit of the Adelaidean sequence. High angle histric thrusts of an imbricate fan (or sigmoidal faults of a duplex system?) stem from this detachment fault.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1993
Where: Adelaide Geosyncline, Kanmantoo Province, southern Adelaide fold belt, South Australia
Keywords: Honours; Geology; geophysics; structural geology; structural model
Description: This item is only available electronically.
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Appears in Collections:School of Physical Sciences

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02wholeGeoHon.pdfWhole thesis (as available)11.34 MBAdobe PDFView/Open

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