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The Ordovician system in the Ida Bay area

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Sharples, C (1979) The Ordovician system in the Ida Bay area. Honours thesis, University of Tasmania.

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Abstract

Ordovician sedimentary rocks in the Ida Bay area occur in
a north-south trending Tabberabberan anticline, and in some further
outcrops having doubtful structural relationships. Early
Ordovician quartzites containing gastropods are overlain on Marble
Hill by 350 metres of limestone ranging in age from Late Chazyan to
Trentonian.
Ten lithofacies are distinguished in the limestones on
Marble Hill, most of which represent sediments deposited in
depositional regression cycles in a prograding tidal flat
environment. While the lower 240 metres of limestones represent
supratidal-intertidal conditions, the upper 110 metres represent
intertidal-subtidal conditions.
Siliceous sediments on Coal Hill, north of the Lune River,
appear to represent Ordovician Limestones which have been completely
silicified, probably by a process related to silcrete horizon
formation.
A primary Ordovician magnetisation is no longer present in
the limestones on Marble Hill; instead a secondary magnetisation
of mid-Cretaceous age has overprinted previous magnetisations in
the limestone, probably as a result of burial and increased heat
flow related to the rifting of the Tasman Sea.

Item Type: Thesis (Honours)
Keywords: Tasmania, Lune River, Ordovician, Limestone, Stratigraphy, Palaeoecology, paleomagnetism
Copyright Holders: The Author
Copyright Information:

Copyright 1979 the author

Date Deposited: 20 Jul 2016 04:30
Last Modified: 20 Jul 2016 04:30
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