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- W2063880340 abstract "The Proterozoic sequence in the central part of the Georgetown Inlier has been divided into the Etheridge, Langlovale, Croydon and Inorunie Groups. The Early to Middle Proterozoic Etheridge Group consists of shallow-water, fine-grained, clastic metasedimentary rocks, and minor basaltic lavas and related dolerite intrusions. It was deposited in a uniformly subsiding basin in a continental setting sometime between 2400 and 1570 Ma. It was first deformed at ∼ 1570 Ma (D1) and again at ∼ 1470 Ma (D2) by major folding events accompanied by low- to intermediate-pressure metamorphism, mainly in the greenschist and amphibolite facies, but ranging into the granulite facies in places during D2. The grade of metamorphism increases from west to east. Extensive S-type plutonic magmatism accompanied D2. In the west the Langlovale Group, a fluviatile to marine, pro-deltaic facies, post-dates D1, and was deposited before D2. It is moderately folded but not regionally metamorphosed. Post-orogenic magmatism (also S-type) is represented in the western part of the inlier by the subaerial felsic ignimbrite of the Croydon Volcanic Group and related subvolcanic granitoids. The volcanic rocks are overlaim by the fluviatile Inorunie Group which is of uncertain age. Neither the Croydon Volcanic Group nor the Inorunie Group is appreciably deformed or metamorphosed. In the eastern quarter of the inlier, a largely metavolcanic (andesitic to felsic) sequence may be an allochthonous terrain of Early Palaeozoic age, but it could be Proterozoic. Known Proterozoic rocks, thought to have been thrust over this sequence, crop out on the eastern edge of the inlier. They are the Halls Reward Metamorphics and maficultramafic rocks including the Boiler Gully Complex. Their relationship to the Etheridge Group is uncertain. Convective mantle upwelling could account for the extension of the continental crust which allowed deposition of the Etheridge Group. No rifting is apparent, and only the ‘sag phase’ of the model of Etheridge et al. may be represented. Underplating of the crust could account for the metamorphism and felsic magma generation during the Middle Proterozoic. The Etheridge Group shows characteristics of both tectonostratigraphic cycles recognized elsewhere in nothern Australia, and without better radiometric control, correlation is difficult." @default.
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- W2063880340 date "1988-10-01" @default.
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- W2063880340 title "Proterozoic stratigraphy and tectonic history of the Georgetown Inlier, northeastern Queensland" @default.
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- W2063880340 doi "https://doi.org/10.1016/0301-9268(88)90079-4" @default.
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