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• W2102100058 endingPage "2799" @default.
• W2102100058 startingPage "2771" @default.
• W2102100058 abstract "A re-evaluation of existing onshore and offshore gravity, magnetic, seismic reflection, and well data from the Australo-Antarctic margins suggests that magmatism and along-strike lithospheric heterogeneities have influenced the localization of initial rifting. The 3D crustal architecture of the Australian and Antarctic margins, which formed during multiple rifting episodes spanning ~80 My, reveal local asymmetries along strike. Rift structures from the broad, late Jurassic (165-145 Ma) rift zone are partially overprinted by a narrower, mid-to-late Cretaceous rift zone ~100 Ma, which evolved in highly extended crust. This late-stage rift zone is located within a region of heterogeneous crust with faults that cut late syn-rift strata, interpreted as a continent ocean transition zone. This late stage transitional rift is populated by seismically identified rift-parallel basement highs and intra-crustal bodies with corresponding positive Bouguer gravity and magnetic anomalies. These undrilled features can be interpreted as exposures of exhumed mantle rocks, lower crustal rocks and/or as discrete magmatic bodies. Our results suggest that strain across an initially broad Australo-Antarctic rift system (165-145 Ma) migrated to a narrow rift zone with some magmatism at 100-83 Ma. Breakup did not occur until ~53 Ma within the eastern Bight-Wilkes and Otway-Adelie margin sectors, suggesting a west to east propagation of seafloor spreading. The prolonged eastwards propagation of seafloor spreading processes and the increased asymmetry of the Australian-Antarctic margins coincides with a change from rift-perpendicular to oblique rifting processes, which in turn coincide with along- strike variations in cratonic to Palaeozoic lithosphere." @default.
• W2102100058 created "2016-06-24" @default.
• W2102100058 creator A5008365801 @default.
• W2102100058 creator A5042658053 @default.
• W2102100058 creator A5074621972 @default.
• W2102100058 creator A5084234210 @default.
• W2102100058 creator A5085722785 @default.
• W2102100058 date "2013-08-01" @default.
• W2102100058 modified "2023-10-09" @default.
• W2102100058 title "The spatial and temporal evolution of strain during the separation of Australia and Antarctica" @default.
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