Syn-depositional fault controls on the Hellyer Volcanic-hosted massive sulphide deposit
Downs, RC (1993) Syn-depositional fault controls on the Hellyer Volcanic-hosted massive sulphide deposit. Research Master thesis, University of Tasmania.
Hellyer is a late-Middle Cambrian volcanic-hosted massive
sulphide deposit, situated within the Mount Read Volcanics of
The effects of post-depositional folding and wrench faulting have
been removed from the deposit to produce an interpreted Cambrian
seafloor topographic contour map. This map reveals that the
massive sulphide orebody formed within a north-south striking,
fault controlled basin. Intersections of active, syn-depositional
faults appear to have channelled hydrothermal fluids, and hence,
controlled the location of massive sulphide formation.
The most intense hydrothermal fluid flux was focussed on the
intersection of three major structural elements:-
i) north-south striking basin bounding faults,
ii) a northeast striking fault, and
iii) a northwest striking ridge.
Metal-rich stringer veins within the footwall indicate that the
orebody formed during the period of time when northeast striking
faults were actively dilating due to northwest directed
During the waning stages of the hydrothermal system, basaltic
magma rose up through a similar set of fissures and erupted onto
the seafloor, burying and preserving the deposit.
|Item Type:||Thesis (Research Master)|
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|Last Modified:||29 Sep 2012 16:20|
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