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Geology and mineralisation at the Cleveland Mine, western Tasmania

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Collins, PLF (1983) Geology and mineralisation at the Cleveland Mine, western Tasmania. PhD thesis, University of Tasmania.

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Abstract

The Cleveland tin-copper deposit lies within a sequence of
mafic volcanics and clastic sediments with minor limestone, of
probable Eocambrian-Early Cambrian age. The north-east trending
sequence is near vertical to north-west dipping, and faces north-west.
The probable shallow marine volcano-sedimentary succession consists of
an older mafic volcanic sequence (the Deep Creek Volcanics) and a
predominantly clastic sequence (the Crescent Spur Sandstone) which are
separated by a transitional sequence of clastic sediments, mafic
volcanics and limestone (the Hall Formation). The Deep Creek Volcanics
is dominated by spilitic, tholeiitic basalt with intercalated and
interbedded lapilli, litho-vitric and lithic tuff, argillite and
volcaniclastic greywacke. The Hall Formation consists of interbedded
argillite, limestone and turbiditic greywacke and minor chert, lithic
and litho-vitric tuff and spilitic, tholeiitic basalt. It is conformably
overlain by the Crescent Spur Sandstone which consists of
turbiditic greywacke and interbedded mudstone with argillite, chert,
volcaniclastic greywacke and minor spilitic basalt. High-titania,
spilitic basalt in the Deep Creek Volcanics and the Hall Formation
exhibits geochemical affinities to ocean floor basalt, and has whole
rock δ18O compositions similar to marine, hydrothermally metamorphosed
basaltic rock. The volcano-sedimentary sequence is cut by regionally
concordant, tectonically emplaced, older(?) low-titania, mafic-ultramafic
ophiolitic complexes (e.g. the Whyte River complex), and is intruded
by pre-mineralisation, high-titania basalt-dolerite dykes which are
probably associated with the Deep Creek volcanism.

Item Type: Thesis (PhD)
Copyright Holders: The Author
Copyright Information:

Copyright 1983 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).

Additional Information:

Thesis (Ph.D) - University of Tasmania, 1984. Bibliography: leaves 285-302

Date Deposited: 25 Nov 2014 01:00
Last Modified: 17 Jul 2016 23:22
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