Abstract

The Gawler Craton is a complex Archaean to Mesoproterozoic terrane. Defining the age-range of the geology in different areas of the craton is vital to understanding its geological history and aiding mineral exploration. Recent SHRIMP U-Pb results from the Mount Woods Inlier and the Central Gawler Au province clarify the age of magmatic events, and gives an insight into the extent, and significance of the ~1590 Ma Hiltaba Suite. Further to this, the U-Pb dating has helped constrain the age of mineralisation in several areas. Data from felsic and mafic igneous rocks from the Mount Woods Inlier show a predominant age-range of ~1590 Ma to ~1580 Ma. However, ~1708 Ma granite has also been identified. Along with inherited zircon spectra, the older granite may have important implications for unravelling the pre-Hiltaba history of the Mount Woods Inlier and its relationship to other Australian Proterozoic cratons. As high-grade metamorphic rocks are common in the Mount Woods Inlier, the significance and timing of their metamorphism have also been examined. The age of magmatism in the Central Gawler is similar to the Mount Woods Inlier, with ~1590 Ma to ~1580 Ma igneous activity dominating. However, felsic igneous rocks of the Barns prospect (Adelaide Resources) are significantly older at ~1690 Ma. Mafic dykes from this area have also been dated, and although a similar age was returned, the zircons analysed may represent the age of the host rock into which the dyke has intruded. Granites and sedimentary rocks from the Tarcoola goldfield returned ages around 1590-1580 Ma and 1730-1715 Ma. Granitoid from the Weednanna prospect (Aquila Resources) has a Hiltaba age of ~1590 Ma.
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 - PowerPoint

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2004

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

PowerPoint
geochemistry
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

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

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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-db52-7506-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

2008-11-27

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

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pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
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fax:
+61 2 6249 9960; or
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1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

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