--> --> Normal Fault Growth Analysis of Australia's Southern Margin: Evidence From 3-D Seismic Reflection Data in the Ceduna Sub-Basin, Great Australian Bight and Deep-Water Otway Basin
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Normal Previous HitFaultNext Hit Growth Analysis of Australia's Southern Margin: Evidence From 3-D Seismic Reflection Data in the Ceduna Sub-Basin, Great Australian Bight and Deep-Water Otway Basin

Abstract

We use three-dimensional (3D) seismic reflection data to analyse the structural evolution of normal Previous HitfaultNext Hit arrays in the Ceduna Sub-basin and deepwater Otway Basin, along Australia's southern margin. Implementing the use of displacement-distance, displacement-depth and expansion index analysis identifies synkinematic stratal geometries and the timing and style of normal Previous HitfaultNext Hit growth. The Ceduna Sub-basin displays an array of strike-linked listric faults, decoupled at a marine mud of late Albian age. Differing structural style during the deposition of two independent delta systems of Cenomanian and Campanian-Maastrichtian age has consequently created vertically segmented normal Previous HitfaultNext Hit growth and structural evolution in accordance with both the segmented coherent Previous HitfaultNext Hit model and the isolated Previous HitfaultNext Hit model. This implies that these Previous HitfaultNext Hit growth models need not be mutually exclusive in their applicability to the structural evolution of a single Previous HitfaultNext Hit system. Upper Cretaceous basement reactivation at the shelfal hinge zone of the deepwater Otway Basin has nucleated gravitationally driven normal Previous HitfaultNext Hit segments with growth trends in accordance with the isolated Previous HitfaultNext Hit model. Previous HitFaultNext Hit segments directly above major basement faults display Turonian-Maastrichtian growth and Previous HitfaultNext Hit segments over basement plateaus only displaying Campanian-Maastrichtian growth. This implies that while the Previous HitfaultNext Hit growth is driven by gravitational forces in both the Ceduna Sub-basin and deepwater Otway Basin, basement interaction in the deepwater Otway Basin has contributed significantly more control over normal Previous HitfaultTop growth timing and location.