Buried Inset‐Valleys in the Eastern Yilgarn Craton, Western Australia: Geomorphology, Age, and Allogenic Control

Broekert, Peter de; Sandiford, Mike

doi:10.1086/430244

Cited by 69 publications

(30 citation statements)

References 64 publications

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“…The recent age of endorheism development, limited sediment influxes over the period, and limited aeolian reworking altogether explain the preservation of paleovalleys in the topography of Western Australia (Alley et al, 2009;Beard, 2002;Beard, 1973;Bunting et al, 1973;de Broekert and Sandiford, 2005;Hou et al, 2008;van de Graaf, 1977). Analysis of the drainage pattern indicates that the network of flow lines has remained stable since its formation during the Albian emergence, with only sporadic changes in the connectivity of flow lines due to river diversions.…”

Section: Methodsmentioning

confidence: 99%

“…The goal is to explore the consequences of a diminishing water balance (gains minus losses) on river incision, sediment deposition, and the size of lakes produced over time (Figure 2). This step is constrained 1) by various independent environmental proxies of precipitation and temperature Martin, 2006;McGowran et al, 2004;McLaren et al, 2014), 2) by the erosional response of rivers to post Middle Miocene tectonic deformation (Bunting et al, 1973;Cope, 1974;McGowran et al, 2004;Müller et al, 2012;Whitney et al, 2016) and erosional shoreline formation during the Middle Miocene north of the GAB (Hou et al, 2003;Hou et al, 2008), inferred from the present-day topography (see following section), 3) by the amount of sediment stored within valleys (Alley et al, 2009;Beard, 2002;Clarke, 1994a;de Broekert and Sandiford, 2005;Jones, 1990), and 4) by the evolution of lake salinity (Clarke, 1994b;English et al, 2001;Zheng et al, 1998).…”

Section: Methodsmentioning

confidence: 99%

“…Accordance of elevations along the interfluves indicates that little dissection has taken place on ridgelines, which have therefore experienced areal diffuse erosion which in the Australian interior typically occurs at rates of 2-5 m/My (Fujioka et al, 2014;Kohn et al, 2002;Nott and Roberts, 1996;Struck et al, 2015). The paleovalleys experienced systematic sediment filling in the Middle Eocene (Alley et al, 2009;de Broekert and Sandiford, 2005). Correcting for interfluve erosion and valley alluviation provides an upper estimate of total incision.…”

Section: Geomorphologic Signature Of Aridificationmentioning

confidence: 99%

“…Valleys debouching in the GAB are graded to the base of an Eocene erosional shoreline, and filled by estuarine deposits. It has been suspected that some paleovalleys continue below the former shore platform below the base of the erosional shorelines (de Broekert and Sandiford, 2005;Jones, 1990). Another erosional shoreline formed during a Middle Miocene highstand, set lower than the Eocene erosional shoreline due to 60 m of surface uplift occurring during the interval.…”

Section: Geomorphologic Signature Of Aridificationmentioning

confidence: 99%

“…Before drying out this drainage delivered water, dissolved and particulate sediments to the North West Shelf (NSW) and the Great Australian Bight (GAB). Part of this drainage network predates the Cretaceous, especially on the Yilgarn Craton (de Broekert and Sandiford, 2005). Most of the drainage was laid out during the emergence of the CanningOfficer basin ~ 110 Ma ago (Frakes et al, 1987).…”

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Transcontinental Cainozoic paleovalleys of Western Australia

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Ding

Salles

et al. 2018

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Geomorphologic Signature Of Aridificationmentioning

confidence: 99%

Section: Geomorphologic Signature Of Aridificationmentioning

confidence: 99%

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confidence: 99%

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Transcontinental Cainozoic paleovalleys of Western Australia

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Ding

Salles

et al. 2018

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Geomorphic and cosmogenic nuclide constraints on escarpment evolution in an intraplate setting, Darling Escarpment, Western Australia

Jakica

Quigley

Sandiford

et al. 2011

Earth Surf Processes Landf

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The~900 km long Darling Scarp in Western Australia is one of the most prominent linear topographic features on Earth. Despite the presence of over-steepened reaches in all westerly flowing streams crossing the scarp, and significant seismic activity within 100 km of the scarp, there is no historical seismicity and no reported evidence for Quaternary tectonic displacements on the underlying Darling Fault. Consequently, it is unclear whether the scarp is a rapidly evolving landform responding to recent tectonic and/or climatic forcing or a more slowly evolving landform. In order to quantify late Quaternary rates of erosion and scarp relief processes, we obtained measurements of the cosmic-ray produced nuclide beryllium-10 ( 10 Be) from outcropping bedrock surfaces along the scarp summit and face, in valley floors, and at stream knickpoints. Erosion rates of bedrock outcrops along the scarp summit surface range from 0·5 to 4·0 m Myr -1. These are in the same range as erosion rates of 2·1 to 3·6 m Myr -1 on the scarp face and similar to river incision rates of 2·6 to 11·0 m Myr -1 from valley floor bedrock straths, indicating that the Darling Scarp is a slowly eroding 'steady state' landform, without any significant contemporary relief production over the last several 100 kyr and possibly several million years. Knickpoint retreat rates determined from 10 Be concentrations at the bases of two knickpoints on small streams incised into the scarp are 36 and 46 m Myr . If these erosion rates were sustained over longer timescales, then associated knickpoints may have initiated in the mid-Tertiary to early Neogene, consistent with early-mid Tertiary marginal uplift. Ongoing maintenance of stream disequilibrium longitudinal profiles is consistent with slow, regional base level lowering associated with recently proposed continental-scale tilting, as opposed to differential uplift along discrete faults. Cosmogenic 10 Be analysis provides a useful tool for interpreting the palaeoseismic history of intraplate near-fault landforms over 10 5 to 10 6 years.

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A Fossil Morphology: The Miocene Fluvial Network of the Western Taurus (Turkey)

Monod¹,

Kuzucuoğlu²

2019

World Geomorphological Landscapes

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Lower Miocene conglomerates in the Köprü and Manavgat basins contain pebbles that can be confidently traced back to their source areas, owing to their distinctive lithologies. Among others, are the green Hu¤lu volcanics (Late Trias), known only in allochthonous units from the Beyflehir region, or the Alanya blueschists, restricted to the Sugözü unit in the Alanya Massif. The problem is to find out how this detrital material could have travelled about eighty kilometres through the Taurus calcareous units during the Miocene. Fortunately, the present drainage system is not yet fully reorganised in the Taurus, and large areas of the chain still retain fossil morphologies. These may be seen in the upper karstic areas of the chain, where a large part of a high surface (1500-2200 m) is preserved. On this surface several dry valleys, some of them 400 m deep, with meanders and tributaries, have been recognised. They are disconnected from the present drainage, and represent fragments of a former network directed NE-SW, at right angles to the structures of the Taurus chain. The age of this network may be attributed indirectly to the Early Miocene. On the other hand, the presence of blueschist fragments in conglomerates of the Aksu Basin cannot be explained through a NE-SW-directed drainage system, and implies instead that the Alanya Massif extends to the west below the Miocene cover of the Antalya Gulf. Later, Late Miocene faulting fragmented the high surface and disrupted the drainage system. Uplift of the Taurus chain followed in the Pliocene and Quaternary, and is responsible for the extensive karstic circulation seen today, which left aside remnants of the ancient morphology of the chain.

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Buried Inset‐Valleys in the Eastern Yilgarn Craton, Western Australia: Geomorphology, Age, and Allogenic Control

Cited by 69 publications

References 64 publications

Transcontinental Cainozoic paleovalleys of Western Australia

Transcontinental Cainozoic paleovalleys of Western Australia

Geomorphic and cosmogenic nuclide constraints on escarpment evolution in an intraplate setting, Darling Escarpment, Western Australia

A Fossil Morphology: The Miocene Fluvial Network of the Western Taurus (Turkey)

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