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Towards a tectonic framework for the Gawler Craton

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Created 13/01/2025

Updated 13/01/2025

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The tectonic evolution of the Gawler Craton is defined by two periods of tectonism both of which lead to apparent cratonisation. Megacycle 1 developed during the period 2550 Ma to 2400 Ma, and megacycle 2 tectonic events occurred from 1900 Ma to 1550 Ma. Recent research has lead to recognition of major basin(s) in the eastern and northern Gawler Craton, that formed around 1760-1720 Ma. Detritus in part was derived from a source region that has affinities with lower Willyama Supergroup sources. The role of plate margin processes in the evolution of the Gawler Craton is discussed. The St Peter Suite resembles an arc system, however sutures and even the polarity of possible subduction remain unclear. It is suggested that fertile mineralised regions are characterised by tectonic processes that lead to hydration of lower crust and upper mantle, and a tectonic regime that lead to large-scale deeply-derived fluid systems. We need to understand which structures were active during dehydration events and where major boundaries exist in terrains. We need to image those systems geophysically, and look for crust-mantle connections where rehydration processes are likely to have occurred

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Title Towards a tectonic framework for the Gawler Craton
Language eng
Licence Not Specified
Landing Page https://devweb.dga.links.com.au/data/dataset/ca59a7a8-2e44-4587-a19f-046f21e295fe
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
Data Portal Data.gov.au