Abstract

Copper-gold mineralisation in the Moonta-Wallaroo district of the south-eastern Gawler Craton is associated with regionally extensive magmatism and Na-Fe-K metasomatism, typical of Fe-oxide Cu-Au mineral provinces worldwide. In the Moonta-Wallaroo district, early widespread albite+/-actinolite+/-magnetite alteration is closely associated with magmatic fluids from granites of the Hiltaba Suite (ca. 1600 Ma) infiltrating the metasedimentary Wallaroo Group host rocks. Zones of biotite-magnetite alteration, often in highly foliated structural zones, also formed at this time and are associated with minor Cu mineralisation. Dating of monazite and titanite associated with magnetite-bearing alteration shows a strong temporal link with Hiltaba magmatism. Copper mineralisation is most closely associated with later chlorite-quartz-hematite-kfeldspar veining and alteration which overprints, replaces and demagnetises the early magnetite-bearing alteration. Latest stage alteration occurs as kaolinite-quartz and quartz-carbonate-hematite epithermal style alteration and veining, most notably along the Alford Shear Zone on the southern margin of the Tickera Granite. This late argillic alteration is also seen as a late overprint in the Wheal Hughes mine at Moonta. Drill targeting has historically often been of magnetic anomalies, but alteration paragenesis suggests that magnetic lows due to de-magnetising copper-bearing fluids may be better drill targets.
Google map showing geographic bounding box with values North bound -32.573 East bound 138.339 West bound 136.57 South bound -35.459
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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)

2002-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

68373 Product http://www.ga.gov.au/metadata-gateway/metadata/record/68373/

Keywords

PowerPoint
geochemistry
AU-SA
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-32.573
East bound
138.339
West bound
136.57
South bound
-35.459

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

a05f7892-db51-7506-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 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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