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Bounty Gold Mine : deformation history and the development of ore fluid pathways within an iron formation host, Western Australia

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Rutherford, Robert A(Robert Alexander) (1992) Bounty Gold Mine : deformation history and the development of ore fluid pathways within an iron formation host, Western Australia. Research Master thesis, University of Tasmania.

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Abstract

The Bounty orebody has a steep plunge and is bound within strata parallel shear zones
which are developed in an iron formation horizon. A footwall ultramafic volcanic
sequence and a hanging wall gabbro bound the mineralized iron formation which dips
steeply west. Shearing occurred during deformation event Dn and a peak contact
metamorphic grade of lower amphibolite fades.
Deformation in pre-Dn times was dominated by strong east-west directed
compression which resulted in complex, upright folding and thrusting of the
supracrustal sequence. With cessation or relaxation of the compression batholiths,
plutons and porphyritic stocks, dykes and sills of granite to granodiorite composition
intruded the folded greenstone sequence and broad contact metamorphic aureoles
were formed. A period of vertically oriented, maximum compressive stress (Dn)
succeeded the intrusive event. Resulting strain was focused along the footwall and
hanging wall boundaries of the iron formation and shear zones with a normal
movement sense developed. The hanging wall boundary of the iron formation, which
was locally rotated west of north during intrusion of a pre-Dn pluton, underwent down
dip or steep oblique shear movement with a normal sense. Sheared lithological
boundaries striking about 4° to 8° west of north were dilated, developing ore fluid
pathways with a steep plunge.
The ore fluid pathways are controlled by the rheological contrast and original shape of
the iron formations hanging wall boundary during Dn. The original shape was
influenced by intrusion of a pre-Dn pluton proximal to the deposit.

Item Type: Thesis (Research Master)
Keywords: Rock deformation, Gold ores
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:

Maps in pocket at back of vol. Includes bibliographical references (p. 77-79). Thesis (M.Econ.Geol.)--University of Tasmania, 1993

Date Deposited: 03 Feb 2015 03:19
Last Modified: 11 Mar 2016 05:55
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