Particle-size analyses of Widgelli Parna in South-east Australia

Blackburn, G

doi:10.1071/sr9810355

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…(2005)). Any mineral and organic material that had become weakly aggregated in the dust traps following deposition would be dispersed, but this regime is not expected to be capable of disrupting more strongly aggregated material such as parna (Blackburn, 1981), which may have been transported and deposited in a pelletal form.…”

Section: Methodsmentioning

confidence: 99%

Æolian dust deposition rates, particle‐sizes and contributions to soils along a transect in semi‐arid New South Wales, Australia

Cattle¹,

McTainsh

Elias³

2009

Sedimentology

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The entrainment, transport and deposition of æolian dust are important processes affecting soil development at the margins of deserts. To assess accurately the impact of deposited æolian dust on soil development, it is important not only to measure total dust deposition rates, but to distinguish additions of remotely and regionally sourced dust from locally derived material as well (which should not be viewed as new soil material as it is derived from æolian re‐mobilization of an existing soil). Because of the well‐established relationship between dust particle‐size and distance travelled from source, the particle‐size distribution of deposited dusts can be used to identify the distance to probable source regions, in addition to identifying matching topsoil particle populations. Three dust traps were located along a transect of semi‐arid south‐eastern Australia, to measure æolian dust deposition rates between late 2000 and late 2001. The particle‐size distributions of selected dust deposits were measured and, with the aid of meteorological data, probable dust source regions determined. Particle‐size distributions of the topsoils at each dust trap location were also measured to determine if any dust and soil particle populations matched. Although the sampling period was relatively short, and there was relatively little dust storm activity in this part of Australia during this time, a clear pattern of diminishing total dust deposition was measured downwind along the south‐east dust path. Dust deposition rates were also moderate to low by global standards. Source regions of deposited dust were interpreted as being: (i) a combination of south‐western and local sources; (ii) a combination of north‐western and local sources; and (iii) a mixed source where dust was rained‐out. The relative importance of these sources was correlated strongly with seasonal weather conditions, although the proportion of local dust in each deposit was greater at the arid (western) end of the transect. The effects of deposited dust on soil profile development are greatest at the western and central transect locations. At the western location, a fine‐grained particle population distinctive of the south‐western and north‐western regional dusts and a coarse silt‐sized particle population characteristic of local dusts, are also present in the topsoil, altering the texture of this Arenosol derived from dune sand. At the central location, where a Calcisol has formed in lacustrine lunette sediment, local dust of the same size as the dominant silt population of the topsoil continues to be deposited, while minor topsoil populations of very fine‐grained silt match regional and long‐distance dusts deposited at the site. Deposited dust appears to have been a less important soil development factor at the more humid eastern site because of the much smaller rates of dust deposition there. Nevertheless, a minor population of very fine silt particles in the Vertisol topsoil matches long‐distance dusts deposited at the site, suggesting a small input ...

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Section: Methodsmentioning

confidence: 99%

Æolian dust deposition rates, particle‐sizes and contributions to soils along a transect in semi‐arid New South Wales, Australia

Cattle¹,

McTainsh

Elias³

2009

Sedimentology

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“…Small occurrences of carbonate loess have been recorded in Victoria (Gill, 1973;Gill and Segnitt, 1982) and relatively thin deposits of clayey loess ('parna') occur in New South Wales, Victoria and South Australia (Butler, 1956;Walker and Costin, 1971;Figure 2 Distribution of loess in China (partly modified from Liu Tung Sheng et al, 1982). Blackburn, 1981). In North Africa, much of the material reputed to be loess (Rathjens, 1928;Brunnacker, 1973) appears to be fine aeolian sand or silty sand (Smalley and Vita-Finizi, 1968).…”

Section: Loess Distributionmentioning

confidence: 97%

Loess

Pye

1984

Progress in Physical Geography: Earth and Environment

104

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“…The sand-sized pellets of clay and silt present in the megafan sediments are common within Riverine Plain fluvial sediments and have also been recorded from aeolian regolith in Australia (Beattie 1970;Bowler 1973;Blackburn 1981). These aggregates form under seasonally hot, dry climates from high smectite clay soils such as vertisols, which are characterised by their capacity to swell and shrink upon wetting and drying, respectively (Rust and Nanson 1989;Maroulis and Nanson 1996;Wakelin-King and Webb 2007).…”

Section: Geomorphic and Sedimentary Processesmentioning

confidence: 99%

Megafans of the Northern Victorian Riverine Plains, SE Australia

Kapteinis¹,

Webb²,

White³

2023

Fluvial Megafans on Earth and Mars

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Low-angle megafans occur along the northern boundaries of the Victorian Uplands and extend into the Murray Basin. These include the Loddon River, Campaspe River, and Bullock Creek, which range in length from 90 km to 120 km from apex to toe. The Loddon and Bullock fans overlap significantly in their middle and northern extents. Because of their very low topographic gradients (< 0.001 ), these depositional features had previously been classified as general channel and flood sediments of the Shepparton Formation, a Pliocene-to Holocene-aged floodplain formation. Airborne radiometric imaging has nonetheless allowed identification of distinct, fan-like features extending north into the Murray Basin. Radiocarbon dating of the Bullock Creek and Loddon River surface sediments has provided ages of 7,270 yr BP and 140 yr BP, respectively. Sediment textures progress down-fan from coarser to finer material, with individual sites dominated by silt or additions of sand-sized aggregates of clay and silt particles. The fans were formed largely by high-discharge, intermittent floods within a complex, interconnected distributive channel system, with smaller inputs from day-to-day channel deposition. Sediment sources include a combination of redeposited windblown silt and weathered material from basalt flows and Paleozoic metasediments in the upland catchments.

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Particle-size analyses of Widgelli Parna in South-east Australia

Cited by 7 publications

References 2 publications

Æolian dust deposition rates, particle‐sizes and contributions to soils along a transect in semi‐arid New South Wales, Australia

Æolian dust deposition rates, particle‐sizes and contributions to soils along a transect in semi‐arid New South Wales, Australia

Loess

Megafans of the Northern Victorian Riverine Plains, SE Australia

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