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- W3193732241 abstract "Understanding the patterns and characteristics of sedimentary deposits on the conjugateAustralian‐Antarctic margins is critical to reveal the Cretaceous‐Cenozoic tectonic, oceanographic, andclimatic conditions in the basin. However, unraveling its evolution has remained difficult due to thedifferent seismic stratigraphic interpretations on each margin and sparse drill sites. Here, for the firsttime, we collate all available seismic reflection profiles on both margins and use newly available offshoredrilling data to develop a consistent seismic stratigraphic framework across the Australian‐Antarctic basins.We find sedimentation patterns similar in structure and thickness, prior to the onset of Antarctic glaciation,enabling the basinwide correlation of four major sedimentary units and their depositional history. Weinterpret that during the warm and humid Late Cretaceous (~83–65 Ma), large onshore river systems on bothAustralia and Antarctica resulted in deltaic sediment deposition offshore. We interpret that the onset ofclockwise bottom currents during the early Paleogene (~58–48 Ma) formed prominent sediment driftdeposits along both continental rises. We suggest that these currents strengthened and progressed farthereast through the Eocene. Coevally, global cooling (<48 Ma) and progressive aridification led to a large‐scaledecrease in sediment input from both continents. Two major Eocene hiatuses recovered by the IntegratedOcean Discovery Program site U1356A at the Antarctic continental slope likely formed during thispreglacial phase of low sedimentation and strong bottom currents. Our results can be used to constrainfuture paleo‐oceanographic modeling of this region and aid the understanding of the oceanographic changesaccompanying the transition from a greenhouse to icehouse world." @default.
- W3193732241 created "2021-08-30" @default.
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- W3193732241 date "2019-12-01" @default.
- W3193732241 modified "2023-10-07" @default.
- W3193732241 title "Tectonic, Oceanographic, and Climatic Controls on the Cretaceous-Cenozoic Sedimentary Record of the Australian-Antarctic Basin" @default.
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