The geology of the Royal George area
Beattie, RD (1967) The geology of the Royal George area. Honours thesis, University of Tasmania.
The Silurian (?) to Lower Devonian Mathinna Beds have been
folded during the Tabberabberan Orogeny and later intruded by the Royal
George Granite Complex of probable early Late Devonian age. The Complex
is a high level stock, with sharp margins and a narrow contact metamorphic
aureole. Its major rock types are coarse-grained granites,
porphyries and microgranites, which are alkali-rich and have a low
K/Rb ratio. The latter is suggestive of strong differentiation. Low
grade tin mineralization is associated with the Complex.
A Permian marine and non-marine succession is unconformable
on the Mathinna Beds and granite. It is only 150 feet thick over a
basement high near Royal George, but thickens to 406 feet at St. Pauls
Dome to the west. The basement high may have been above sea level
until the time of deposition of the Grange Mudstone Correlate. Silllike
(?) Jurassic dolerite intrudes both the Permian strata and the
overlying Triassic non-marine, arenaceous sediments.
Fluvial and lacustrine (?) sediments may have been deposited
behind Tertiary basalt which dammed (?) the South Esk River near Avoca.
|Item Type:||Thesis (Honours)|
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|Deposited By:||Ms Sue Li|
|Deposited On:||12 Aug 2011 12:47|
|Last Modified:||17 Sep 2012 12:08|
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