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The character, origin and significance of the Howards Basalt, within the Cambrian Tyndall Group, Western Tasmania

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Scott, H (2000) The character, origin and significance of the Howards Basalt, within the Cambrian Tyndall Group, Western Tasmania. Honours thesis, University of Tasmania.

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Abstract

The Howards Basalt forms a minor mafic unit in the basal Lynchford Member of the
Cambrian Tyndall Group. The unit is andesitic in character, and occurs most frequently as
a monomictic breccia, strongly altered by chlorite, sericite and haematite.
The unit was formed by the eruption of lava both explosively and effusively, in an
extensional and subaqueous environment, to produce five main facies.
The Howards Basalt can be geochemically correlated with the Suite ill rocks of the Mount
Read Volcanics, which include the high K Que-Hellyer footwall volcanic rocks, and the
shoshonitic Lynch Creek Basalt.
The Howards Basalt occurs on the Comstock - Mt Lyell prospective horizon, on the same
stratigraphic horizon as the Henty deposit. It is also thought to have formed in a similar
fashion to the Spillway Basalt, which occupies another favourable horizon. The mode of
emplacement of the Howards Basalt unit may have been conducive to mineralisation.

Item Type: Thesis (Honours)
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Date Deposited: 26 Aug 2011 01:11
Last Modified: 15 Sep 2017 01:06
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