Marginal fault systems of the Northern Carnarvon Basin: Evidence for multiple Palaeozoic extension events, North-West Shelf, Australia

I’Anson, Amy; Elders, Chris; McHarg, Sam

doi:10.1016/j.marpetgeo.2018.11.040

Cited by 23 publications

(9 citation statements)

References 9 publications

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“…This could indicate some degree of Mesozoic transtension influenced by an underlying Palaeozoic fabric. Similar observations on the influence of inherited fabrics on basin architecture have also been made by I'Anson et al (2019).…”

Section: Whitetail Grabensupporting

confidence: 80%

See 1 more Smart Citation

The structural architecture of the central North West Shelf – insights from regional scale mapping of the Triassic succession

Orlov

Nicholson

Bernardel

et al. 2019

ASEG Extended Abstracts

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Section: Whitetail Grabensupporting

confidence: 80%

“…Along this shelf, a prominent escarpment is also mapped under the TR10.0_SB which extends into the Bedout and Beagle sub-basins (Figures 2 and 4d). The general understanding is that this feature is a Permian carbonate buildup (Paschke et al, 2018;I'Anson et al, 2019).…”

Section: Base Triassic Observationsmentioning

confidence: 99%

The structural architecture of the central North West Shelf – insights from regional scale mapping of the Triassic succession

Orlov

Nicholson

Bernardel

et al. 2019

ASEG Extended Abstracts

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“…The break‐up of Gondwanaland resulted in multiple episodes of rifting on the NW Shelf during the Paleozoic and Mesozoic (Figure 3). The Late Carboniferous to Late Permian was characterized by the break‐away of the Sibamasu block, and resulted in the development of the Westralian Superbasin and the formation of the NE‐trending structural grain that dominates the NW Shelf (Bradshaw et al, 1994; Deng & McClay, 2019; Etheridge & O’Brien, 1994; L’Anson, Elders, & McHarg, 2019; Yeates et al, 1987). Following extension, a post‐rift thermal sag basin developed during the Triassic, which some authors argue was punctuated by shorter periods of compression (e.g.…”

Section: Geological Contextmentioning

confidence: 99%

Quantitative analysis of a footwall‐scarp degradation complex and syn‐rift stratigraphic architecture, Exmouth Plateau, NW Shelf, offshore Australia

et al. 2020

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Interactions between footwall-, hangingwall-and axial-derived depositional systems make syn-rift stratigraphic architecture difficult to predict, and preservation of neterosional source landscapes is limited. Distinguishing between deposits derived from fault-scarp degradation (consequent systems) and those derived from long-lived catchments beyond the fault block crest (antecedent systems) is also challenging, but important for hydrocarbon reservoir prospecting. We undertake geometric and volumetric analysis of a fault-scarp degradation complex and adjacent hangingwall-fill associated with the Thebe-2 fault block on the Exmouth Plateau, NW Shelf, offshore Australia, using high resolution 3D seismic data. Vertical and headward erosion of the complex and fault throw are measured. Seismic-stratigraphic and seismic facies mapping allow us to constrain the spatial and architectural variability of depositional systems in the hangingwall. Footwall-derived systems interacted with hangingwalland axial-derived systems, through diversion around topography, interfingering or successive onlap. We calculate the volume of footwall-sourced hangingwall fans (V HW) for nine quadrants along the fault block, and compare this to the volume of material eroded from the immediately up-dip fault-scarp (V FW). This analysis highlights areas of sediment bypass (V FW > V HW) and areas fed by sediment sources beyond the degraded fault scarp (V HW > V FW). Exposure of the border fault footwall and adjacent fault terraces produced small catchments located beyond the fault block crest that fed the hangingwall basin. One source persisted throughout the main synrift episode, and its location coincided with: (a) an intra-basin topographic high; (b) a local fault throw minimum; (c) increased vertical and headward erosion within the fault-scarp degradation complex; and (d) sustained clinoform development in the immediate hangingwall. Our novel quantitative volumetric approach to identify through-going sediment input points could be applied to other rift basin-fills. We highlight implications for hydrocarbon exploration and emphasize the need to incorporate interaction of multiple sediment sources and their resultant architecture in tectono-stratigraphic models for rift basins.

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“…The break-up of Gondwanaland resulted in multiple episodes of rifting on the NW Shelf during the Paleozoic and Mesozoic (Figure 3). The Late Carboniferous to Late Permian was characterized by the break-away of the Sibamasu block, and resulted in the development of the Westralian Superbasin and the formation of the NE-trending structural grain that dominates the NW Shelf (Bradshaw et al, 1994;Deng & McClay, 2019;Etheridge & O'Brien, 1994;L'Anson, Elders, & McHarg, 2019;Yeates et al, 1987). Following extension, a post-rift thermal sag basin developed during the Triassic, which some authors argue was punctuated by shorter periods of compression (e.g.…”

Section: Geological Contextmentioning

confidence: 99%

Quantitative analysis of a footwall-scarp degradation complex and syn-rift stratigraphic architecture, Exmouth Plateau, NW Shelf, offshore Australia

Barrett¹,

Hodgson²,

Jackson³

et al. 2020

Preprint

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Interactions between footwall-, hangingwall- and axial-derived depositional systems make syn-rift stratigraphic architecture difficult to predict, and preservation of net-erosional source landscapes is limited. Distinguishing between deposits derived from fault-scarp degradation (consequent systems) and those derived from long-lived catchments beyond the fault crest (antecedent systems) is also challenging but important for hydrocarbon reservoir prospecting. We undertake geometric and volumetric analysis of a fault-scarp degradation complex and adjacent hangingwall-fill associated with an individual fault block in the northern Carnarvon Basin, NW Shelf, Australia. Fault throw, and vertical and headward erosion of the complex are measured. Seismic-stratigraphic and seismic facies analyses allow us to constrain the along-strike architectural variability of the footwall-derived fans in the hangingwall. Footwall-derived systems interacted with hangingwall- and axial-derived systems, through diversion around topography, interfingering, or successive onlap. We calculate the volume of footwall-sourced hangingwall fans for nine quadrants along the fault block, and compare this to the volume of material eroded from the immediately up-dip fault-scarp. This analysis highlights areas of sediment bypass (excess erosion) and areas fed by sediment sources beyond the degraded fault scarp (excess hangingwall-fill). Exposure of the border fault footwall and adjacent fault terraces produced small catchments located beyond the fault crest that fed the hangingwall basin. One source persisted nearly throughout the syn-rift episode, and its location coincided with: (i) an intra-basin topographic high; (ii) a local fault throw minimum, possibly representing a breached relay ramp; (iii) increased vertical and headward erosion within the fault-scarp degradation complex; and (iv) sustained clinoform development in the immediate hangingwall. Our novel quantitative volumetric approach to identify through-going sediment input points and areas dominated by sediment bypass could be applied to other rift basin-fills. We also emphasise the need to incorporate interaction of multiple sediment sources and their resultant architecture in tectono-stratigraphic models for rift basins.

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Marginal fault systems of the Northern Carnarvon Basin: Evidence for multiple Palaeozoic extension events, North-West Shelf, Australia

Cited by 23 publications

References 9 publications

The structural architecture of the central North West Shelf – insights from regional scale mapping of the Triassic succession

The structural architecture of the central North West Shelf – insights from regional scale mapping of the Triassic succession

Quantitative analysis of a footwall‐scarp degradation complex and syn‐rift stratigraphic architecture, Exmouth Plateau, NW Shelf, offshore Australia

Quantitative analysis of a footwall-scarp degradation complex and syn-rift stratigraphic architecture, Exmouth Plateau, NW Shelf, offshore Australia

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