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Geology and mineralisation of the White Devil deposit, Tennant Creek, Northern Territory, Australia

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Cozens, Gregory J (1992) Geology and mineralisation of the White Devil deposit, Tennant Creek, Northern Territory, Australia. Coursework Master thesis, University of Tasmania.

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Abstract

Investigations into the textures in the ironstones, relationships between Au-Bi-Cu
mineralisation and associated chlorite, metal zonation and distribution and
paragenesis have been made on the White Devil Deposit in the Proterozoic Tennant
Creek district of the Northern Territory. The textures within the ironstone revealed that
they consist of intergrown and interlocking masses of magnetite laths pseudomorphed
after hematite. The consistent textures and overgrowth of primary magnetite on the
laths and in fractures indicates the ironstones existed in entirety and were deformed
prior to magnetite alteration. The open porous lath texture of the ironstones has
implications for ore deposition.
The mineralising stage was accompanied by the deposition of chlorite. The
gold, bismuth sulphosalts and chalcopyrite are intergrown with coarse grained chlorite
in the spaces between the magnetite laths and around magnetite stringers.
The chlorite associated with ore and altered sediments ranges from low
temperature green Mg-rich pycnochlorite to high temperature blue Fe-rich ripidolite.
Geothermometry has shown that the chlorite has a temperature range from 230 to
330°C. Talc alteration of Mg chlorite occurred during the waning stage of the
hydrothermal event.
The metal zonation within the deposit is not clear, even within the orebodies
studied.
The initial hematite ironstone formed in chloride sediments within the shear.
The fluids became more reduced and interacted with the hematite, altering it to
magnetite. The mineralising stage saw the introduction of higher temperature fluids
which interacted with the magnetite causing the deposition of gold and chlorite
followed by bismuth and copper with associated chlorite at higher temperatures. As
the fluids cooled, alteration of Mg chlorite to talc, martitisation and quartz flooding of
the Pinter Ironstone occurred.

Item Type: Thesis (Coursework Master)
Keywords: Ore deposits, Gold ores, Tiger's eye
Copyright Holders: The Author
Copyright Information:

Copyright 1992 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:

Includes bibliographical references (p. 54-55). Thesis (M.Econ.Geol.)--University of Tasmania, 1993

Date Deposited: 08 Dec 2014 23:59
Last Modified: 19 Jul 2016 02:45
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