4/7/2024 0 Comments Office 2013 bagasGeochemical vectors applied to existing stratigraphic interpretations indicate a trend towards more felsic composition with younging, providing an alternative proxy for relative stratigraphy and a tool for exploration and correlation across the GTO. Furthermore, the combination of volcanic structures, including fiamme and hyaloclastites, and a mafic HFSE geochemical signature of the pyroclastic and volcaniclastic-sedimentary turbidite successions suggests a syndepositional volcanic front within an oceanic arc-backarc system during deposition of the Dead Bullock Formation (and equivalents). The data presented here show geochronological, sedimentological, petrographic, and geochemical evidence for the existence of a volcanic arc (‘Tanami Arc’) in the GTO at ~1912 Ma. The Granites-Tanami Orogen (GTO) is a lower-greenschist to amphibolite facies succession of >1840 Ma backarc basalts and volcaniclastic-sedimentary rocks that was metamorphosed (~1850–1840 Ma), and later intruded by granites and granodiorites (~1825–1791 Ma) during assembly of the Kimberley Craton, proto-Northern Australia Craton, and the Arunta Region.
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