Abstract

The Olympic Cu-Au province on the eastern margin of the Gawler Craton includes three major regions of hydrothermal alteration and mineralisation: Stuart Shelf basement (including the Olympic Dam Cu-U-Au deposit), Mount Woods Inlier and Moonta-Wallaroo-Roopena region. Each of these regions contains high-, moderate- and low-temperature Fe-oxide rich alteration, Cu-Au±U mineralisation, and felsic to mafic Mesoproterozoic (~1590 Ma) intrusions of the Hiltaba Suite with or without coeval Gawler Range Volcanics. The three regions are interpreted to represent the ÔfootprintsÕ of separate crustal-scale thermal anomalies. Three key hydrothermal alteration and ore mineral assemblages are recognised in the metallogenic province: (1) CAM: calcsilicate-alkali feldspar ± magnetite ± Fe-Cu sulfides (generally minor); (2) MB: magnetite-biotite ± Fe-Cu sulfides, and (3) HSCC: hematite-sericite-chlorite-carbonate ± Fe-Cu sulfides ± U, REE minerals. Ore grade Cu-U-Au mineralisation is generally associated with the HSCC assemblage, which is paragenetically later than the CAM and MB assemblages in most deposits and prospects. The crustal level of exposure of the hydrothermal systems may vary significantly between and within the three mineralised regions. The CAM, MB and HSCC assemblages and associated Cu-Au mineralisation represent a possible spectrum of settings from deeper, higher temperature, shear-hosted environments to near-surface, low-temperature breccia and fault settings. The Olympic Cu-Au province on the eastern margin of the Gawler Craton includes three major regions of hydrothermal activity: Stuart Shelf basement (including the Olympic Dam Cu-U-Au deposit), Mount Woods Inlier and Moonta-Wallaroo-Roopena region. Each of these regions contains high-, moderate- and low-temperature Fe-oxide rich alteration, Cu-Au±U mineralisation, and felsic to mafic Mesoproterozoic (~1590 Ma) intrusions of the Hiltaba Suite with or without Gawler Range Volcanics. The three regions may represent the 'footprints' of separate crustal-scale thermal anomalies. Hydrothermal alteration and ore mineral assemblages show systematic variations along and within the metallogenic belt. Three key assemblages are recognised: (i) CaAM: calcsilicate - alkali feldspar ± magnetite ± Fe-Cu sulfides (generally minor); (ii) MB: magnetite - biotite ± Fe-Cu sulfides, and (iii) HSCC: hematite - sericite - chlorite - carbonate ± Fe-Cu sulfides ± U, REE minerals. Ore grade Cu-U-Au mineralisation is generally associated with the HSCC assemblage which is paragenetically later than the CaAM and MB assemblages in most deposits and prospects. The crustal level of exposure of the hydrothermal systems may vary significantly between and within the three regions of hydrothermal activity. The CaAM, MB and HSCC assemblages and associated Cu-Au mineralisation represent a possible 'continuum' of settings from deeper, higher temperature, shear-hosted environments to near-surface, low-temperature breccia and fault settings.
Google map showing geographic bounding box with values North bound -29.0 East bound 138.0 West bound 133.0 South bound -34.0
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Product Type/Sub Type

dataset - External Publication - Scientific Journal Paper

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2002

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

External Publication
Scientific Journal Paper
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-29.0
East bound
138.0
West bound
133.0
South bound
-34.0

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Unknown

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onLine

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distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-f9f4-7506-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 Date Stamp

2010-10-18

METADATA SECURITY CLASSIFICATION

unclassified

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pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Related Links
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays