Abstract
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Highlights
Felsic volcanic and volcanogenic sedimentary rocks form significant components of Late Archean greenstone belts and comprise 20% of outcropping greenstones in the eastern Yilgarn Craton
On the basis of trace element geochemistry, volcano-sedimentary facies, post 2.72 Ga felsic volcanic rocks in the Eastern Yilgarn have been divided into three associations
(2) Bimodal and intermediate to felsic sub-alkaline volcanic successions, including the high field strength element (HFSE) enriched Melita complex, define a younger age range (2692–2676 Ma), within the Gindalbie domain. This association is interpreted to represent a late rifting phase of the Kurnalpi Terrane arc. Both mafic and felsic lavas have relatively high eNdT values, and rhyolites high zircon saturation temperatures (>800°), with no evidence of zircon inheritance, indicating that parent magmas were derived from subduction-modified mantle with minimal involvement of older crust, with rhyolites produced by ACF processes or melting of older arc crust
Summary
Felsic volcanic and volcanogenic sedimentary rocks form significant components of Late Archean greenstone belts and comprise 20% of outcropping greenstones in the eastern Yilgarn Craton. On the basis of trace element geochemistry, volcano-sedimentary facies, post 2.72 Ga felsic volcanic rocks in the Eastern Yilgarn have been divided into three associations. (1) Calc-alkaline andestite dominated complexes and associated sedimentary rocks characterise the Kurnalpi Terrane, and range in age between 2704 and 2716 Ma. Volcanic facies, and the geochemistry of intermediate lavas are similar to those in modern intra-arc settings, and imply a similar tectonic environment.
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