Abstract

An array of northeast-trending shear zones in the north-west Gawler Craton of South Australia has been implicated in widely disparate Proterozoic continental reconstructions. These shear zones are interpreted to have formed in response to sinistral transpression, and dissect the north-west Gawler Craton into several geological domains, each with contrasting metamorphic histories. New 40Ar/39Ar data provide age constraints for movement along these shear zones, and are interpreted to indicate that the Karari, Tallacootra and Coorabie Shear Zones were last active at not, vert, similar1450 Ma. Despite distinct differences in metamorphic grade, the various geological domains bounded by shear zones exhibit evidence for commonality in event histories prior to deformation at not, vert, similar1450 Ma, albeit at different crustal levels. This is interpreted to indicate that deformation at not, vert, similar1450 Ma was responsible for reshuffling of crustal blocks that were already adjacent, rather than amalgamation of exotic terranes. The new data also provide additional evidence for a widespread metamorphic and deformational event at not, vert, similar1530-1550 Ma across the north-western Gawler Craton. The timing of deformation at not, vert, similar1450 is not, vert, similar100 Ma younger than suggested in several published tectonic reconstructions and, importantly, is also significantly older than Grenvillian-age tectonism in adjacent provinces to the west and north.
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)

2006

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

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

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

Metadata File Identifier

a05f7892-f9eb-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

2010-10-13

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
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