Authors / CoAuthors
Lambeck, A. | Hand, M. | Barovich, B. | Huston, D. | Gibson, G.
Abstract
The break-up of the supercontinent Columbia is refined by late Paleoproterozoic sedimentary basins in eastern Australia which record a significant change in the neodymium isotopic composition and age of clastic input at ~1650 Ma. Basin fill accumulated in the interval ~1690-1650 Ma and was derived from comparatively evolved sources that generated bulk -Nd(1650 Ma) values of -8 to -6. Subsequent sequences that accumulated between ~1650-1640 Ma are characterised by ~1650 Ma detrital grains, contain volcaniclastic intervals around 1650 Ma in age and have bulk -Nd (1650 Ma) values of -2 to -1. Significant sources with the combination of appropriate juvenile compositions and age are not known in Proterozoic Australia, nor known currently in the Siberian Craton or the South China Block. Both the Mazatzal Province Laurentia and the south-western Baltic Shield Idefjord terrane record juvenile volcanism and basin development at 1650 - 1600 Ma, paleomagnetic data and later geological histories suggest a closer match between the eastern part of Proterozoic Australia with the Idefjord terrane. We suggest that felsic volcanic rocks and derived sediments in this province provided a major source of juvenile detritus present in late Paleoproterozoic eastern Australian sedimentary basins, implying paleogeographic links of the Columbian supercontinent between Australia and the south-western Baltic shield, during extensional tectonics at ~1650 Ma.
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nonGeographicDataset
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70301
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- External Publication
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2010-04-09T00:00:00
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