New Constraints on the Tectonics of the Archaean-Palaeoproterozoic transition from the Gawler Craton, South Australia  

Authors / CoAuthors

Reid, A.J. | Jagodzinski, E.A. | Fraser, G.L.

Abstract

The Gawler Craton, South Australia, preserves extensive sedimentary sequences and associated magmatic rocks that span the interval covering the Archaean-Palaeoproterozoic transition, with bimodal calc-alkaline volcanism and associated sedimentation occurring over the interval ~2560-2480 Ma. The pervasive high geothermal gradient metamorphism in the earliest Palaeoproterozoic, ~2470-2420 Ma (Fanning et al., 2007; Jagodzinski et al., 2009) within the Gawler Craton suggests the Gawler Craton is potentially more likely a correlative of the Dhawaar Craton, Sask Craton and other similar terranes, in terms of timing of magmatic and orogenic events (Payne et al., 2009). We report new zircon U-Pb ion probe data collected from Neoarchaean to Earliest Palaeoproterozoic metasedimentary and meta-igneous rocks of the Gawler Craton, South Australia, an important time interval for the development of the Gawler Craton itself that has been investigated by relatively few geochronological studies. The new data show that the interval ~2560-2480 Ma was characterised by deposition and associated magmatism. This was terminated by contractional deformation and high geothermal gradient metamorphism over the interval ~2470-2410 Ma.

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70134

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• dating

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• geology

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• Earth Sciences

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2010-01-01T00:00:00

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