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The geology and mineral deposits of the Moina-Lorinna area

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Gee, CE (1966) The geology and mineral deposits of the Moina-Lorinna area. Honours thesis, University of Tasmania.

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Abstract

The oldest rocks exposed in the area are quartzites and schists
of the Dove Group which underwent considerable deformation during the
Precambrian. Upper (?) Cambrian acid lavas, volcanics, greywackes, cherts,
siltstones and quartzites comprise the Bull Creek Volcanics and the
Lorinna Volcanics. These rocks were formed in an easterly extension of
the Dundas Trough, north of the Tyennan Block. The Dove Granodiorite
intruded these rocks along the southern margin of the Trough in Late
Jukesian (?) times. The petrology of the Cambrian rocks is discussed
in some detail and it is concluded that the acid lavas were derived from
the same magma as the Dove Granodiorite.
Ordovician rocks in this area consist of the Roland Conglomerate
at the base, which is conformably overlain by the Moina Sandstone and the
Gordon Limestone in turn.
During the Tabberabberan Orogeny, these rocks were folded and
faulted into northwesterly trending structures. The Dolcoath Granite
intruded late in the Tabberabberan Orogeny causing some metamorphism of
the country rocks. It is suggested the granite intruded as a northerly
dipping, roughly tabular body. There may be a small cupola in the
Stormont area.
The majority of the mineral deposits in this area are genetically
related to the Dolcoath Granite. A fairly distinct zone of wolframcassiterite
deposits surrounds the northern part of the granite. Around
this, is a zone of auriferous sulphides. The mineralogy of these two zones
is described. Areas most likely to prove of economic importance are indicated
together with suggested sites for a preliminary diamond-drilling
programme.

Item Type: Thesis (Honours)
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Date Deposited: 18 Aug 2011 05:33
Last Modified: 11 Mar 2016 05:56
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