The timing of the Last Glacial Maximum in Australia

Barrows, Timothy T.; Stone, John O.; Fifield, L.K.; Cresswell, Richard

doi:10.1016/s0277-3791(01)00109-3

Cited by 207 publications

(157 citation statements)

References 35 publications

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“…14-15 ka (Barrows et al, 2001(Barrows et al, , 2002Fink et al, 2002, and unpublished data); supporting the interpretation of a warming trend through this transitional period. Barrows et al (2001Barrows et al ( , 2002, however, report an advance centred on 16.8 AE 1.4 cal. ka (Mt Twynam Advance) in both the Snowy Mountains and the Tasmanian Highlands.…”

Section: Geochronologysupporting

confidence: 56%

“…Dating of events has also been achieved using thermoluminescence (TL) (Nanson et al, 1992a(Nanson et al, , 1995(Nanson et al, , 2003 and in situ exposure dating ( 10 Be, 26 Al, 36 Cl) (Barrows et al, 2001(Barrows et al, , 2002(Barrows et al, , 2004Fink et al, 2000, and unpublished data;Kiernan et al, 2004), while a precise age-depth profile of ice-core ages for the Law Dome (Antarctica) has been achieved by synchronisation to the GRIP ice core through changes in gas (methane) content (Morgan et al, 2002;van Ommen et al, 2004). All of these methods are independent of fluctuations in atmospheric 14 C content.…”

Section: Geochronologymentioning

confidence: 99%

“…Exposure dating of moraine sequences at Mt Kosciusko in the Snowy Mountains of the Australian mainland (Barrows et al, 2001) and in alpine valleys of Tasmania (Fink et al, 2000;Barrows et al, 2002;Kiernan et al, 2004, and unpublished data) are now providing new chronologies of glacial advance and retreat through this period (Fig. 3).…”

Section: Geochronologymentioning

confidence: 99%

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Integration of ice‐core, marine and terrestrial records for the Australian Last Glacial Maximum and Termination: a contribution from the OZ INTIMATE group

Turney

Haberle

Fink

et al. 2006

J Quaternary Science

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The degree to which Southern Hemisphere climatic changes during the end of the last glacial period and early Holocene (30-8 ka) were influenced or initiated by events occurring in the high latitudes of the Northern Hemisphere is a complex issue. There is conflicting evidence for the degree of hemispheric 'teleconnection' and an unresolved debate as to the principle forcing mechanism(s). The available hypotheses are difficult to test robustly, however, because the few detailed palaeoclimatic records in the Southern Hemisphere are widely dispersed and lack duplication. Here we present climatic and environmental reconstructions from across Australia, a key region of the Southern Hemisphere because of the range of environments it covers and the potentially important role regional atmospheric and oceanic controls play in global climate change. We identify a general scheme of events for the end of the last glacial period and early Holocene but a detailed reconstruction proved problematic. Significant progress in climate quantification and geochronological control is now urgently required to robustly investigate change through this period.

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Section: Geochronologysupporting

confidence: 56%

Section: Geochronologymentioning

confidence: 99%

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Integration of ice‐core, marine and terrestrial records for the Australian Last Glacial Maximum and Termination: a contribution from the OZ INTIMATE group

Turney

Haberle

Fink

et al. 2006

J Quaternary Science

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“…Kaplan et al, 2011), and we used a standard density of 2.7 g cm -3 where none was given in the original studies. To aid the identification of cumulative peaks in exposure time we employed cumulative Probability Density Functions (PDFs; Barrows et al, 2002) using 100-year bins, and excluded any exposure ages that, within errors, fall outside the last glacial cycle between 110 and 10 ka.…”

Section: Methodsmentioning

confidence: 99%

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Darvill

Bentley

Stokes

et al. 2016

Quaternary Science Reviews

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“…increasing disequilibria, with decreasing deposition age of the Wilkawillina sediments (Fig. 3a) suggests, on face value, that the comminution age of the sediments increases, and therefore, the sediment residence time increases up section from 45 ka towards the time of the last glacial maximum (LGM) (17-20 ka, Barrows et al, 2002). Before attempting to calculate absolute comminution ages and hence residence times of the Wilkawillina sediments using the comminution approach, it is first important to consider the assumptions inherent in the method.…”

Section: Wilkawillina Sediment 234 U-238 U Disequilibriamentioning

confidence: 99%

Considerations for U-series dating of sediments: Insights from the Flinders Ranges, South Australia

Handley¹,

Turner²,

Dosseto³

et al. 2013

Chemical Geology

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Uranium isotope ratios have been determined for the fine-grained detrital fraction of Pleistocene Wilkawillina valley-fill sediments, four local Proterozoic bedrock samples and fine-grained aeolian material from a sand dune deposit of the Flinders Ranges, South Australia. The aim was to quantify the comminution age, i.e. the time elapsed since physical weathering of the bedrock, and residence time of the valley-fill sediments and to place tighter constraints on input parameters for the comminution age calculation. Despite using two independent approaches for determination of the recoil lost fraction of 234U from the sediment (weighted geometric and surface area estimates), samples fail to produce realistic comminution ages and hence, residence times. The issues involved in the ability to determine sediment comminution ages are discussed. The (234U/238U) activity ratio of the local bedrock is not in secular equilibrium, despite the bedrock being much older than 1Ma, i.e. the timeframe for 234U and 238U to reach secular equilibrium in a closed system. Using the average Flinders Ranges bedrock (234U/238U) ratio instead of an assumed (234U/238U) activity ratio of unity for the source would significantly reduce calculated residence times. This result warrants concern for future studies using the comminution approach for which a secular equilibrium source (234U/238U) activity ratio is assumed. Significant input of aeolian material may modify the measured (234U/238U) activity ratios. Such input may be more tightly constrained in future studies using rare earth element and radiogenic isotopic data. Future comminution studies would benefit from further consideration of the importance of 1) leaching lost 234U from source rock and bulk sediment samples, 2) wind deposition of fine-grained material and 3) the appropriateness and robustness of sample pre-treatment procedures. AbstractUranium isotope ratios have been determined for the fine-grained detrital fraction of Pleistocene Wilkawillina valley-fill sediments, four local Proterozoic bedrock samples and fine-grained aeolian material from a sand dune deposit of the Flinders Ranges, South Australia. The aim was to quantify the comminution age, i.e. the time elapsed since physical weathering of the bedrock, and residence time of the valley-fill sediments and to place tighter constraints on input parameters for the comminution age calculation. Despite using two independent approaches for determination of the recoil lost fraction of 234 U from the sediment (weighted geometric and surface area estimates), samples fail to produce realistic comminution ages and hence, residence times. The issues involved in the ability to determine sediment comminution ages are discussed. The ( 234 U/ 238 U) activity ratio of the local bedrock is not in secular equilibrium, despite the bedrock being much older than 1 Ma, i.e. the timeframe for 234 U and 238 U to reach secular equilibrium in a closed system. Using the average Flinders Ranges bedrock ( 234 U/ 238 U) ratio instead of an ass...

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The timing of the Last Glacial Maximum in Australia

Cited by 207 publications

References 35 publications

Integration of ice‐core, marine and terrestrial records for the Australian Last Glacial Maximum and Termination: a contribution from the OZ INTIMATE group

Integration of ice‐core, marine and terrestrial records for the Australian Last Glacial Maximum and Termination: a contribution from the OZ INTIMATE group

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Considerations for U-series dating of sediments: Insights from the Flinders Ranges, South Australia

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