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A study of the petrology and petrophysics of the Black Swan Komatiite, Eastern Goldfields, Western Australia


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Italiano, P 2003 , 'A study of the petrology and petrophysics of the Black Swan Komatiite, Eastern Goldfields, Western Australia', Research Master thesis, University of Tasmania.

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The Black Swan Project, situated some 43 km south of northeast of Kalgoorlie in
Western Australia, formed a case study for an assessment of the petrophysical
properties of the Black Swan Succession. The Succession hosts a number of discrete
magmatic nickel sulphide bodies and associated disseminated mineralization. The
study was undertaken with the aim of establishing possible vectors to ore within the
project area and potentially elsewhere in the Yilgam Craton.
Komatiite flows that host mineralization were examined using a proprietary downhole
logging system, OMS~LOGG, which recorded magnetic susceptibility, inductive
conductivity, resistivity, natural gamma and gamma-gamma readings on selected
diamond drill core samples sourced from both trough and flanking channel
environments. Hand-held magnetic susceptibility, specific gravity and conductivity
readings were taken from both ore-grade material and host rock lithologies, and a
number of representative drillcore samples described in terms of mineralogy, geology
and geomechanical data. This information was then used to relate the geophysical
properties to individual lithological units.
However, establishing such relationships proved difficult, as the variable
metamorphic influences within the Black Swan Succession have resulted in wide ranging
and inhomogeneous mineralogical assemblages, with complex distribution
and composition of magnetic oxide minerals.
In general, potentially mineralised trough environments were characterized by high
conductivity and a higher density. Carbonate was the most abundant mineral in this
environment. Conversely, the channel flanks had lower conductivities, and lower
density readings, while chlorite was the primary mineral constituent.
Susceptibility readings returned similar ranges in both environments, indicating the
technique could not be used as a discriminator. No correlation was noted between
manual estimations of magnetite content and magnetic susceptibility or between
manual estimates of opaque mineral percentages and magnetic susceptibility. A weak inverse linear relationship was noted between the percentage of opaque material and
the gamma-gamma readings in downhole logs.

Item Type: Thesis - Research Master
Authors/Creators:Italiano, P
Copyright Holders: The Author
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Copyright 2003 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

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