Natural seismicity and tectonic geomorphology reveal regional transpressive strain in northwestern Australia

Keep, Myra; Hengesh, James; Whitney, Beau

doi:10.1080/08120099.2012.667439

Cited by 14 publications

(15 citation statements)

References 28 publications

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“…Sheppard et al 2010b), including present-day seismic movements (Revets et al 2009;Keep et al 2012). The three principal sutures associated with the assembly of the West Australian Craton, as well as most of the other crustal structures, show evidence for multiple reactivation (Figure 9), in extensional, compressional and oblique-slip settings.…”

Section: Implications For Continental Collision and Subsequent Crustamentioning

confidence: 93%

Crustal architecture of the Capricorn Orogen, Western Australia and associated metallogeny

Johnson

Thorne

Tyler

et al. 2013

Australian Journal of Earth Sciences

123

108

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Section: Implications For Continental Collision and Subsequent Crustamentioning

confidence: 93%

Crustal architecture of the Capricorn Orogen, Western Australia and associated metallogeny

Johnson

Thorne

Tyler

et al. 2013

Australian Journal of Earth Sciences

123

108

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“…Throughout the WASZ, Mesozoic rift-related normal faults have been reactivated to accommodate oblique crustal shortening (Sykes, 1978;Crone et al, 1997;Cathro and Karner, 2006;Revets et al, 2009;Keep et al, 2012;Müller et al, 2012;McPherson et al, 2013). Reverse reactivation has occurred along offshore structures such as the Barrow Island anticline, Rowley Shoals Ridge, and Scott Reef (e.g.…”

Section: Geologic and Tectonic Settingmentioning

confidence: 94%

Geomorphological evidence for late Quaternary tectonic deformation of the Cape Region, coastal west central Australia

Whitney

Hengesh

2015

Geomorphology

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A late Pleistocene (Marine Isotope Stage 5e) emergent marine sequence fringes the coastline of the Cape Region of coastal west central Australia and provides elevation and age control to characterize the locations and rates of crustal deformation. There is a systematic measurable change in relative paleo sea-level elevations across the Cape Region. High-precision leveling of modern and Pleistocene shoreline features indicates the minimum elevation range of MIS 5e shoreline features along the coast is 10.4 m. This compares with the 2.5 m elevation range for observed modern shoreline analogs. The lack of continuity of MIS 5e shoreline elevations along 300 km of coastline demonstrates continuing tectonic deformation along coastal anticlines in the Cape Region. Topographic expression of MIS 5e features indicates tectonic uplift consistent with late Neogene to Quaternary deformation on the Cape Cuvier and Cape Range anticlines. Post-MIS 5e tectonic uplift rates are up to 0.054 ± 0.035 mm/yr at fold axial locations. Estimated subsidence rates are − 0.013 ± 0.034 mm/yr on fold limbs. While the estimated vertical tectonic deformation is small and the rates are low, the geomorphological data also demonstrate tectonic activity, not stability.

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“…Old rift-related normal structures act as zones of weakness and are being preferentially exploited to accommodate crustal shortening (Sykes, 1978;Crone et al, 1997;Cathro and Karner, 2006;Revets et al, 2009;Keep et al, 2012;Müller et al, 2012;McPherson et al, 2013). Former rift-related extensional structures have undergone transform and contractional reactivation leading to structural inversion of basin sequences (Densley et al, 2000;King et al, 2010).…”

Section: Tectonicsmentioning

confidence: 94%

“…An en echelon series of normal fault segments strike approximately north-south along the eastern margin of the southern Carnarvon basin (Hocking et al, 1985a(Hocking et al, ,1985bCrostella, 1995). Fault segments within this system are reactivated with an oblique-reverse (transpressional) sense of motion (Keep et al, 2012). As the reactivated segments grow, the segments lengthen and connect.…”

Section: Regional Neotectonic Significancementioning

confidence: 99%

Geomorphological evidence of neotectonic deformation in the Carnarvon Basin, Western Australia

Whitney

Hengesh

2015

Geomorphology

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This study examines channel-scale morphodynamics of ephemeral streams in the onshore Carnarvon basin in arid west-central Western Australia. The rivers in this region have low gradients, the landscape has low relief, and the rates of climatically and tectonically driven geomorphic processes also are low. As a result, the rivers in the Carnarvon alluvial plain are highly sensitive to minor perturbations in base level, channel slope, and fluvial energy. We use channel planform adjustments, stream gradient changes, and floodplain profiles across multiple ephemeral streams within a variety of catchments and flow regimes to determine if tectonically driven land level changes are affecting channel form and fluvial processes. Growth of individual fold segments is shown to have altered stream and floodplain gradients and triggered repeated avulsions at structurally controlled nodes. Aligned perturbations in channel form across multiple channel-fold intersections provide systematic geomorphic evidence for the location and orientation of neotectonic structures in the region. These features occur as a belt of low relief anticlines in the Carnarvon alluvial plain.

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Natural seismicity and tectonic geomorphology reveal regional transpressive strain in northwestern Australia

Cited by 14 publications

References 28 publications

Crustal architecture of the Capricorn Orogen, Western Australia and associated metallogeny

Crustal architecture of the Capricorn Orogen, Western Australia and associated metallogeny

Geomorphological evidence for late Quaternary tectonic deformation of the Cape Region, coastal west central Australia

Geomorphological evidence of neotectonic deformation in the Carnarvon Basin, Western Australia

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