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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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1982-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81109 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81109/

Keywords

GA Publication
Journal
QLD
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

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

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

fae9173a-7032-71e4-e044-00144fdd4fa6

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 SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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