SIRIUS Performance: 10Be, 26Al and 36Cl measurements at ANSTO

Wilcken, Klaus M.; Fujioka, Toshiyuki; Fink, David; Fülöp, Réka‐Hajnalka; Codilean, Alexandru T.; Simon, Krista; Mifsud, Charles; Kotevski, Steven

doi:10.1016/j.nimb.2019.02.009

Cited by 38 publications

(18 citation statements)

References 19 publications

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“…Following crushing and sieving, magnetic minerals were separated using a Franz magnetic separator and the non-magnetic fraction washed in Aqua-Regia at 100°C for at least 24 hours. Samples were analysed using the 10MV ANTARES and 6MV SIRIUS facilities at ANSTO (Fink and Smith, 2007;Wilcken et al, 2017Wilcken et al, , 2019. The above sample preparation steps were carried out at the University of Wollongong.…”

Section: Cosmogenic 10 Be and 26 Al Analysismentioning

confidence: 99%

“…Quartz dissolution and extraction of the Be and Al fractions was done at ANSTO following procedures described in Child et al (2000), using~300 μg of 9 Be from a low-level beryl carrier solution added prior to complete HF dissolution. Samples were analysed using the 10MV ANTARES and 6MV SIRIUS facilities at ANSTO (Fink and Smith, 2007;Wilcken et al, 2017Wilcken et al, , 2019. The native Al concentration of the samples ranged from 112 to 299 ppm (median = 158 ppm) and was determined via ICP-OES with a precision of 3-4% (Fujioka et al, 2015b).…”

Section: Cosmogenic 10 Be and 26 Al Analysismentioning

confidence: 99%

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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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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: Cosmogenic 10 Be and 26 Al Analysismentioning

confidence: 99%

Section: Cosmogenic 10 Be and 26 Al Analysismentioning

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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“…Meteoric cosmogenic 10 Be is produced in the atmosphere via nuclear reactions of cosmicray particles with nuclei such as nitrogen and oxygen. 10 Be readily attaches to aerosols and dust and, with a short residence time of ∼ 1 year, is deposited on the Earth surface mainly via precipitation (Willenbring and von Blanckenburg, 2010). In open depositional environments (i.e.…”

Section: Beryllium-10mentioning

confidence: 99%

“…Beryllium was separated from other cations by passage through anion and cation exchange columns, converted to Be(OH) 2 , oxidised to BeO at 800 • C, and finally mixed with Nb powder. AMS 10 Be / 9 Be measurements of these 59 samples were performed at the Centre for Accelerator Science, ANSTO (Australia), on the 6 MV SIRIUS accelerator (Wilcken et al, 2019). The measured 10 Be / 9 Be values were normalised to either the 2007-KN5-2 (nominal ratio of 8.558 × 10 −12 ) or the 2007-KN5-3 (6.320 × 10 −12 ) standard (Nishiizumi et al, 2007).…”

Section: Beryllium-10mentioning

confidence: 99%

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

et al. 2020

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Abstract. Northern New Zealand is an important location for understanding Last Glacial Interval (LGI) palaeoclimate dynamics, since it is influenced by both tropical and polar climate systems which have varied in relative strength and timing. Sediments from the Auckland Volcanic Field maar lakes preserve records of such large-scale climatic influences on regional palaeo-environment changes, as well as past volcanic eruptions. The sediment sequence infilling Orakei maar lake is continuous, laminated, and rapidly deposited, and it provides a high-resolution (sedimentation rate above ∼ 1 m kyr−1) archive from which to investigate the dynamic nature of the northern New Zealand climate system over the LGI. Here we present the chronological framework for the Orakei maar sediment sequence. Our chronology was developed using Bayesian age modelling of combined radiocarbon ages, tephrochronology of known-age rhyolitic tephra marker layers, 40Ar∕39Ar-dated eruption age of a local basaltic volcano, luminescence dating (using post-infrared–infrared stimulated luminescence, or pIR-IRSL), and the timing of the Laschamp palaeomagnetic excursion. We have integrated our absolute chronology with tuning of the relative palaeo-intensity record of the Earth's magnetic field to a global reference curve (PISO-1500). The maar-forming phreatomagmatic eruption of the Orakei maar is now dated to > 132 305 years (95 % confidence range: 131 430 to 133 180 years). Our new chronology facilitates high-resolution palaeo-environmental reconstruction for northern New Zealand spanning the last ca. 130 000 years for the first time as most NZ records that span all or parts of the LGI are fragmentary, low-resolution, and poorly dated. Providing this chronological framework for LGI climate events inferred from the Orakei sequence is of paramount importance in the context of identification of leads and lags in different components of the Southern Hemisphere climate system as well as identification of Northern Hemisphere climate signals.

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“…Given the long half-life of 10 Be and the increasingly low analytical backgrounds that can be realized (Wilcken et al 2019), it is now possible to analyse samples covering a wide range of temporal settings, including historic times (Schaefer et al 2009). The rate at which cosmogenic nuclides are produced is extremely low -a couple of atoms per gram of rock per year (Borchers et al 2016) -and the rapid attenuation of cosmic radiation with depth (Fig.…”

Section: In-situ Cosmogenic Nuclide Analysis For Catchment Erosionmentioning

confidence: 99%

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

Holtvoeth

Codilean

Lacey

et al. 2020

Earth-Science Reviews

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Understanding and quantifying the processes and geochemical cycles associated with catchment erosion, the development of soils and weathering horizons, and terrestrial habitat change beyond the scales of modern observations remain challenging. Such research, however, has become increasingly important to help predict future landscape change in light of increasing land use and rapid global warming. We herein review organic and inorganic geochemical tools applied to depositional archives to better understand various aspects of landscape evolution on geological time scales. We highlight the potentials and limitations of inorganic geochemical analytical methods, such as major element geochemistry, metal and radiogenic isotopes, and in-situ cosmogenic nuclides, as qualitative, semi-quantitative, and quantitative proxies for the transformation of bedrock material via regolith and soils to sediments. We also show how stable isotope geochemistry applied to lacustrine endogenic carbonates can be used to infer rock-water interactions, vegetation change, and soil development in limestone-rich catchments. Proxies focusing on the silicilastic element of sediment formation, transport and deposition are also ideally combined with organic geochemical proxies for vegetation change and soil organic matter evolution in a catchment to gain a comprehensive picture of the Critical Zone's evolution over time. Multi-proxy and multidisciplinary research combining organic and inorganic geochemical techniques from several sedimentary archives in the same catchment have high potential to provide comprehensive information on Quaternary landscape evolution and thus improve the robustness of associated forecasting models.

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SIRIUS Performance: 10Be, 26Al and 36Cl measurements at ANSTO

Cited by 38 publications

References 19 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

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

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SIRIUS Performance: 10Be, 26Al and 36Cl measurements at ANSTO

Cited by 38 publications

References 19 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

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

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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