Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/111846
Type: Thesis
Title: A comparative petrological and geochemical study of garnetiferous rocks associated with base metal deposits in the Kanmantoo Trough: meta-exhalites or synmetamorphic alteration zones?
Author: Smith, M. K.
Issue Date: 1998
School/Discipline: School of Physical Sciences
Abstract: Garnetiferous rocks show a spatial association with several base metal deposits in the Early Cambrian Kanmantoo Trough. These rocks include coticules (garnet-quartz rocks) and banded iron formation (BIF) and are hosted by pelitic metasediments of the Tapanappa Formation. Petrological and geochemical investigations have been made of garnetiferous rocks associated with the Scotts Creek Ag-Pb-Zn and Angas Pb-Zn deposits and in the vicinity of the Kanmantoo Cu deposit. Geochemical features indicate variations between coticules from the three localities but general similarities with coticules from Broken Hill, N S. W. BIF from the Kanmantoo area is also comparable to the equivalent lithologies in the Willyama Complex, at Olary and Broken Hill. Geochemical diagrams (Fe-Mn-(Co+Cu+Ni), Al/(Al+Fe+Mn ) vs Fe/Ti, Ti02 vs Al203 and chondrite-normalised rare earth element (REE)) for coticules and iron formations suggest variable contributions of detrital and hydrothermal components. The hydrothermal component, is generally 30 to 50 wt. percent for coticules, and >70 wt percent for BIF. The stratigraphic position, layer parallel banding and unusual geochemistry suggest the coticules associated with Scotts Creek, Kanmantoo and Angas deposits are exhalative in origin, and may be termed "meta-exhalites". The Kanmantoo BIF appears to have formed from high temperature submarine hydrothermal fluids and metalliferous sediments analogous to those of the Red Sea and the East Pacific Rise. Coticules and BIFs are indicators of hydrothermal activity and may be local guides to baseĀ­ metal mineralisation. The Mn content of garnet in coticules reflects proximity to Pb-Zn ore, and may be a useful exploration tool.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1998
Where: Kanmantoo Trough, Mount Lofty Ranges, South Australia
Keywords: Honours; Geology; Kanmantoo Group; Tapanappa Formation; garnet; petrology; geochemistry; base-metal ores; 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
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