期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 170, 期 1, 页码 3-6出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/jgs2012-093
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资金
- Australian Research Council (ARC) [DP0878258, DP0897612]
- University of Adelaide
- Australian Research Council [DP0878258] Funding Source: Australian Research Council
The Late Cretaceous Ceduna Delta is the largest deltaic system on the Australian continent, yet its source is unknown. Apatite fission-track data reveal widespread Late Cretaceous exhumation across the southern Australian margin. New detrital zircon analysis of 786 grains from the Gnarlyknots-1 well, which penetrated the offshore delta top, show that the upper part of the delta (Santonian-Maastrichtian) was sourced largely from recycled Permian to Early Cretaceous cover and underlying basement eroded from the margin, proximal to the basin. This challenges the widely accepted model involving distal provenance of >2000 km from the eastern margin of Australia.
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