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The geology and lithogeochemistry of the Palaeozoic Seventy Mile Range Group at Mt. Farrenden, Charters Towers, North Queensland, Australia

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van Eck, M (1994) The geology and lithogeochemistry of the Palaeozoic Seventy Mile Range Group at Mt. Farrenden, Charters Towers, North Queensland, Australia. Coursework Master thesis, University of Tasmania.

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Abstract

The Cambra-Ordovician Seventy Mile Range Group
occurs as an east-west trending volcano-sedimentary
sequence which is host to several significant volcanichosted
massive sulphide (VHMS) deposits. In the Mt
Farrenden area the base of the Group is comprised of
the fine sedimentary units of the Puddler Creek
Formation. These continent-derived units were
deposited into a back-arc environment. This Formation
is- overlain conformably by the rhyoli te-dominated Mt
Windsor Volcanics, and by the Trooper Creek Formatioh
with mixed andesitic, volcaniclastic sedimentary and
daci tic units. Whole rock geochemistry of a limited
sample suite supports a subduction-related relatively
low-K calc-alkaline volcanic arc environment for the
latter two Formations. The recognised volcanic
textures are not unequivocal in their support for a
subaerial to subaqueous environment for the Mt Windsor
Volcanics, although there is better evidence for a
deeper water (submarine?) environment for the T,rooper
Creek Formation. The uppermost part of the Group, the
Rollston Range Formation, is not represented here.
In the Mt Farrenden area the Sevent:y Mile Range
Group is exposed in a prominent south plunging syncline
which is a major deviation from the otherwise general
east-west trend of the Group. The fold axis contains
the thinnest development of the Mt Windsor Volcanics,
and a part of the largest outcrop area of andesi te
within the Group in the Trooper Creek Formation.
Intrusion of the Black Jack Granodiorite in the
northeast and Policeman Creek Granodiorite in the west
occurred during the Late Silurian-Early Devonian.
Massive, coarsely crystalline bari te occurs in a
small ( 30m by 7m) outcrop at the contact between the
Puddler Creek Formation and the overlying Mt Wirtdsor
Volcanics. The barite may represent the remnants of a
submarine hydrothermal vent of the type associated with
volcanic-hosted massive sulphide deposits. However,
hydrothermal alteration, in general, is very poorly
developed within the study area.

Item Type: Thesis (Coursework Master)
Keywords: Sulfide minerals, Geology, Stratigraphic, Geology
Copyright Information:

Copyright 1993 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 (M.Ec.Geol.)--University of Tasmania, 1994. Includes bibliographical references

Date Deposited: 04 Feb 2015 23:19
Last Modified: 08 Jan 2017 23:22
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