Academic literature on the topic 'Kanmantoo Trough'

This item is only available electronically.
Whilst the geology of the Rapid Bay-Second Valley area is known to be both structurally and stratigraphically complex, previous workers (Daily, 1963; Evans 1987; Drayton, 1963; Campana and Wilson, 1955) have been unable to agree on many aspects of the area. Neoproterozoic and Cambrian aged sediments were first deposited in an extensional basin, which was formed due to lithospheric thinning, and associated subsidence (Jenkins, 1986, 1990). These rocks have then been subjected to at least one phase of deformation, the Cambro-Ordovician Delamerian Orogeny (Offler & Fleming, 1968; Thompson, 1970). Listric extensional faults were formed both before and during sedimentation of the rocks, which has created narrow zones of weakness that the subsequent compressional event has exploited, creating thrust faults (Flottman et al., 1994). Structural mapping of the area has revealed that it is transected by two thrust faults and is intensely folded in places. Structural data has been collected during eight weeks of field work and has been compiled into a 1:10 000-scale geological map which accurately represents the area. A computer-generated three-dimensional model has been created for the area, based on this map, and cross and profile sections constructed from the data collected. The model was constructed using Vulcan™ software. Strain analysis has also been conducted on many of the folds in the area.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1995

This item is only available electronically.
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 base­ metal mineralisation. The Mn content of garnet in coticules reflects proximity to Pb-Zn ore, and may be a useful exploration tool.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1998

This item is only available electronically.
The study area is located within the Yankalilla-Myponga Proterozoic lnlier, approximately 60km south of Adelaide. The basement rocks are comprised of a mixture of metasediments and intrusives. The metasediments predominantly comprise of quartz-biotite gneisses and schists. They are intruded by basic dykes, pegmatites and an aplite/microgranite. The basic dykes have oceanic basalt affinities and could originally have been formed during an 'aborted rifting' event, but the more felsic rocks are more likely to lie within plate granites. The origin of the 'Houghton' granulite is difficult to ascertain, because it has a varied internal composition and is closely comparable to a diorite and a shale. The basement inlier rocks are found within the overlying unconformable upper Proterozoic Adelaidean System. They have undergone at least four phases of deformation and metamorphism. Mineral assemblages found in the rocks indicate metamorphism reached at least upper amphibolite facies. The maximum pressure and temperature conditions were calculated from microprobe data. They range from 8-10 kb at 550 -650 C. U-Pb isochron dating was performed on the aplite/microgranite of the area and was found to be 1578+\-22Ma ,which places a minimum age on the inlier rocks. This date obtained and the deformation processes recognized are comparable to other basement rocks in South Australia; noticeably the Gaw1er Craton and the Olary Province. This may indicate a homogeneous terrain once spanned most of South Australia during the lower Proterozoic.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1988