View abstract for Timing of Mesoproterozoic tectonic activity in the northwestern Gawler Craton constrained by 40Ar/39Ar geochronology

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

Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2006-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

71146 Product http://www.ga.gov.au/metadata-gateway/metadata/record/71146/

Keywords

External Publication
Scientific Journal Paper
AU-SA
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

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-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 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