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Geological and geochemical aspects of the Liontown VHMS deposit North Eastern Queensland

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Miller, CR (1996) Geological and geochemical aspects of the Liontown VHMS deposit North Eastern Queensland. Research Master thesis, University of Tasmania.

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Abstract

The Liontown VHMS deposit lies in the central portion of the 165km long, E-W trending, narrow
belt of deformed Cambro-Ordovician marine sediments and volcanics known as the Mount
Windsor subprovince of northeastern Queensland.
Liontown is shown to be a volcanic-associated massive sulphide deposit comprising both seafloor
exhalative and subhalative mineralisation. Metal zonation studies suggest the exhalative
mineralisation was vented onto the seafloor on the edge of a paleo ridge and migrated down slope
to the west and southeast. Sulphur, lead, oxygen and carbon isotope data is consistent with a VHMS
parentage.
The Liontown deposit is temporally associated with the change from dacitic to rhyolitic volcanism
and may have a more shallow water setting than previously considered. The Carrington Lode at
Liontown is a sub-seafloor replacement body interpreted to have formed by the eastward lateral
migrat"i on of hydrothermal fluids preferentially through an ashy and feldspar bearing volcaniclastic
horizon. The associated black Mg-chlorite alteration is infered to mark a zone of seawaterhydrothermal
fluid mixing.
The application of stable isotope and rare earth element (REE) analyses to provide "vectors" to
mineralisation is invesigated in the thesis. The whole rock oxygen isotope data collected along the
footwall alteration system indicates that this technique has good vectoring potential to zones of
elevated hydrothermal temperature. Refinement of the raw data through the calculation of relative
temperature estimates is demonstrated as an important data manipulation procedure, particularly for
data sets where the sample mineralogy is highly variable.
The Liontown carbonate exhalative facies and the sericitic siltstones of the 'favourable horizon'
each have positive europium anomalies (Eu/Eu*>l). In the immediate Liontown deposit area a
proximal to distal trend was observed in the carbonate europium data set suggesting there is some
scope to develop the intensity ofEu/Eu* as a vectoring tooL

Item Type: Thesis (Research Master)
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Date Deposited: 01 Jun 2012 05:38
Last Modified: 11 Mar 2016 05:55
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