Mineral deposition systems at rock art sites, Kimberley, Northern Australia — Field observations

Green, Helen; Gleadow, Andrew; Finch, Damien; Hergt, Janet; Ouzman, Sven

doi:10.1016/j.jasrep.2017.06.009

Cited by 23 publications

(52 citation statements)

References 23 publications

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“…Our work has bearing on how we interpret cosmogenic nuclide derived denudation rates in landscapes with a strong lithological control and emphasises the value of analysing two or more cosmogenic isotopes in basin-scale studies, especially in slowly eroding post-orogenic settings, where depressed 26 Al/ 10 Be ratios can be indicative of dominant geomorphic processes rather than complex exposure histories (e.g., Struck et al, 2018a). Finally, our dataset of bedrock and sediment CRN denudation rates for the Kimberley region is contributing to a new multi-disciplinary research program to date the extensive collection of Aboriginal rock art located in escarpment rock-shelters throughout the region (e.g., Green et al, 2017), by placing limits on the timescales of rock-shelter formation and destruction, and therefore the survival potential of the rock art.…”

Section: Introductionmentioning

confidence: 92%

“…We compare these two datasets to explore what processes control landscape lowering in the region. Finally, our dataset of bedrock and sediment CRN denudation rates for the Kimberley region is contributing to a new multi-disciplinary research program to date the extensive collection of Aboriginal rock art located in escarpment rock-shelters throughout the region (e.g., Green et al, 2017), by placing limits on the timescales of rock-shelter formation and destruction, and therefore the survival potential of the rock art. Modelling results suggest that a large proportion (~60-90%) of river sediment in the Kimberley results from the breakdown and chemical weathering of retreating vertical sandstone rock-walls in contrast to sediment generated by bedrock weathering and erosion on the plateau tops.…”

Section: Introductionmentioning

confidence: 99%

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²⁶Al/¹⁰Be ratios reveal the source of river sediments in the Kimberley, NW Australia

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Codilean

et al. 2019

Earth Surf Processes Landf

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We use cosmogenic 10 Be and 26 Al in both bedrock and fluvial sediments to investigate controls on erosion rates and sediment supply to river basins at the regional scale in the Kimberley, NW Australia. The area is characterised by lithologically controlled morphologies such as cuestas, isolated mesas and extensive plateaus made of slightly dipping, extensively jointed sandstones. All sampled bedrock surfaces at plateau tops, ridgelines, and in the broader floodplain of major rivers over the region show similar slow lowering rates between 0.17 and 4.88 m.Myr -1 , with a mean value of 1.0 ± 0.6 m.Myr -1 (n=15), whilst two bedrock samples collected directly within river-beds record rates that are one to two orders of magnitude higher (14.4 ± 1.5 and 20.9 ± 2.5 m.Myr -1 , respectively). Bedrock 26 Al/ 10 Be ratios are all compatible with simple, continuous subaerial exposure histories. Modern river sediment yield lower 10 Be and 26 Al concentrations, apparent 10 Be basin-wide denudation rates ranging between 1.8 and 7.7 m.Myr -1 , with a median value of 2.6 m.Myr -1 , more than double the magnitude of bedrock erosion rates. 26 Al/ 10 Be ratios of the sediment samples are lower than those obtained for bedrock samples. We propose that these depleted 26 Al/ 10 Be ratios can largely be explained by the supply of sediment to river basins from the slab fragmentation and chemical weathering of channel gorge walls and plateau escarpments that result in diluting the cosmogenic nuclide concentration in river sediments measured at the basin outlets. The results of a mass-balance model suggest that~60-90% of river sediment in the Kimberley results from the breakdown and chemical weathering of retreating vertical sandstone rock-walls in contrast to sediment generated by bedrock weathering and erosion on the plateau tops. This study emphasises the value of analysing two or more isotopes in basin-scale studies using cosmogenic nuclides, especially in slowly eroding post-orogenic settings.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

²⁶Al/¹⁰Be ratios reveal the source of river sediments in the Kimberley, NW Australia

Cazes

Fink

Codilean

et al. 2019

Earth Surf Processes Landf

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“…The median sample size of all samples collected is c. 250 mg. In keeping with the wishes of the Traditional Owners, the site locations are not disclosed here but have been fully documented in an access-controlled database (31). Sampling was approved on site by relevant local Traditional Owners who participated in this fieldwork and under research permits from the Kimberley Land Council/ Balanggarra Aboriginal Corporation and the Western Australian Department of Planning Lands and Heritage (formerly Department of Aboriginal Affairs).…”

Section: Sample Collectionmentioning

confidence: 99%

12,000-Year-old Aboriginal rock art from the Kimberley region, Western Australia

et al. 2020

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The Kimberley region in Western Australia hosts one of the world’s most substantial bodies of indigenous rock art thought to extend in a series of stylistic or iconographic phases from the present day back into the Pleistocene. As with other rock art worldwide, the older styles have proven notoriously difficult to date quantitatively, requiring new scientific approaches. Here, we present the radiocarbon ages of 24 mud wasp nests that were either over or under pigment from 21 anthropomorphic motifs of the Gwion style (previously referred to as “Bradshaws”) from the middle of the relative stylistic sequence. We demonstrate that while one date suggests a minimum age of c. 17 ka for one motif, most of the dates support a hypothesis that these Gwion paintings were produced in a relatively narrow period around 12,000 years ago.

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“…However, the chemical composition of gypsum rock varies from one geographical site to another. Gypsum is primarily composed of CaSO 4 , associated with a wide assortment of accessory minerals, mainly carbonates, silica, and metal oxides [4,5]. The complete characterization of the raw material (as rock and powder) allows us to choose the best one to be used in the fabrication of plasters for building applications, with thermal and acoustic insulating purposes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

et al. 2019

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Building retrofitting plays a key-role in energy saving and a growing interest is focused on insulating materials that allow a reduction in heat loss from envelopes with low thickness, by a process of reducing heating and cooling demand. In this context, a complete characterization of the physical properties of Moroccan natural gypsum materials was carried out. Basic information on the mineralogical, microstructure, thermal, mechanical, and acoustic characteristics of the rocks sampled from two Moroccan regions is provided. It was found that mineralogy, porosity, and water content are the main factors governing the development of the structure and the strength of the samples. The measured values of the porosity were 8.94%, the water content varied between 2.5–3.0% for the two studied typologies, coming from Agadir and Safi, respectively. Gypsum powder was used for fabricating samples, which were investigated in terms of thermal and acoustic performance. Thermal properties were measured by means of a hot disk apparatus and values of conductivity of 0.18 W/mK and 0.13 W/mK were obtained for Agadir and Safi Gypsum, respectively. The acoustic performance was evaluated in terms of absorption coefficient and sound insulation, measured by means of a Kundt’s Tube (ISO 10534-2). The absorption coefficients were slightly higher than the ones of conventional plasters with similar thickness. A good sound insulation performance was confirmed, especially for Safi Gypsum, with a transmission loss-value up to about 50 dB at high frequency.

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Mineral deposition systems at rock art sites, Kimberley, Northern Australia — Field observations

Cited by 23 publications

References 23 publications

²⁶Al/¹⁰Be ratios reveal the source of river sediments in the Kimberley, NW Australia

²⁶Al/¹⁰Be ratios reveal the source of river sediments in the Kimberley, NW Australia

12,000-Year-old Aboriginal rock art from the Kimberley region, Western Australia

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

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Mineral deposition systems at rock art sites, Kimberley, Northern Australia — Field observations

Cited by 23 publications

References 23 publications

26Al/10Be ratios reveal the source of river sediments in the Kimberley, NW Australia

26Al/10Be ratios reveal the source of river sediments in the Kimberley, NW Australia

12,000-Year-old Aboriginal rock art from the Kimberley region, Western Australia

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

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Product

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²⁶Al/¹⁰Be ratios reveal the source of river sediments in the Kimberley, NW Australia

²⁶Al/¹⁰Be ratios reveal the source of river sediments in the Kimberley, NW Australia