Metasomatic/depletion events affecting Cratons and “cratons”

Tom Wise*,Geological Survey of South Australia, Department for Energy and Mining, 11 Waymouth Street, Adelaide, SA5001;[email protected]

Stephan ThielGeological Survey of South Australia, Department for Energy and Mining, 11 Waymouth Street, Adelaide, SA5001;School of Physical Sciences, University of Adelaide, Adelaide, SA5005;[email protected]

Rian DutchGeological Survey of South Australia, Department for Energy and Mining, 11 Waymouth Street, Adelaide, SA5001;School of Physical Sciences, University of Adelaide, Adelaide, SA5005;[email protected]

Mark PawleyGeological Survey of South Australia, Department for Energy and Mining, 11 Waymouth Street, Adelaide, SA5001;[email protected]

Kate RobertsonGeological Survey of South Australia, Department for Energy and Mining, 11 Waymouth Street, Adelaide, SA5001;School of Physical Sciences, University of Adelaide, Adelaide, SA5005;[email protected]

Summary

We integrate seismic tomographic models and filtered gravity anomaly maps to investigate the compositional variations in the SCLM of Australia. We find zones of relative enrichment and depletion coinciding with the spatial extent of major thermal events. Anomalous regions of enrichment may represent subduction metasomatism of the lithospheric mantle, or refertilisation due to asthenospheric upwelling. Regions of apparent depletion signify high-degree melt extraction from a previously more enriched lithosphere.

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Metasomatic/depletion events affecting Cratons and “cratons”

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Metasomatic/depletion events affecting Cratons and “cratons”

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