Citation

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Robertson, C.W., 1982. The role of pre-existing sulphides in copper-ore formation at Mount Isa, Queensland. BMR Journal of Australian Geology and Geophysics  7:2:119-124. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

The sulphide deposit at Mount Isa, northwest Queensland, is a siltstone-shale sequence that has been metamorphosed to lower greenschist facies and variously altered by hydrothermal events. Galena and sphalerite, forming the lead- zinc-silver orebodies, and fine-grained pyrite are interbedded with the sediments, but chalcopyrite mineralisation appears to have overprinted these. In the largest copper orebody, the 1100 Ore body, a massive high-grade core of chalcopyrite is developed at the same stratigraphic level as rich pyrite mineralisation; with a reduction in the concentration of pyrite in this core. Cobalt is strongly associated with the copper ores and shows this same relationship. Sulphur isotope values for the chalcopyrite and pyrite are in the same range, indicating a common sulphur source. Sulphur abundances in the pyritic horizons do not increase with increasing copper grade. These factors support the view that sulphur needed for the formation of chalcopyrite and cobalt-rich sulphides was derived from the pre-existing sequence. Those sulphur sources controlled the copper, silica, and cobalt deposition from the mineralising solutions, and provide the link in explaining the spatial relationship of the copper to the lead-zinc-silver ores.
Google map showing geographic bounding box with values North bound -20.0 East bound 139.5 West bound 138.0 South bound -21.0
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nonGeographicDataset - GA Publication - Journal

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Creative Commons Attribution 3.0 Australia Licence

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Commonwealth of Australia (Geoscience Australia)

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Date (publication)

1982

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geoscientificInformation

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GA Publication
Journal
Earth Sciences

Resource Language

English

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utf8

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unclassified

Geographic Extent

North bound
-20.0
East bound
139.5
West bound
138.0
South bound
-21.0

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Unknown

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pdf

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Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2014-06-23

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Geoscience Australia
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Canberra
Administrative Area
ACT
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Country
Australia
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