University of Tasmania
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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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posted on 2023-05-27, 14:38 authored by van Eck, M
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.


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

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