Rapid age assessment in the Namib Sand Sea using a portable luminescence reader

Stone, Abi; Bateman, Mark D.; Thomas, David S.G.

doi:10.1016/j.quageo.2015.02.002

Cited by 37 publications

(31 citation statements)

References 29 publications

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“…For these reasons, sediment transported through fluvial systems is often incompletely bleached and deposited with an inherited luminescence signal (Wallinga, ; Thomas et al , ; Rittenour, ). The measurement of this inherited luminescence using pOSL readers has been used to understand geomorphological processes in coastal, aeolian, fluvial, glacial, and archaeological settings (Bishop et al , ; Sanderson and Murphy, ; Muñoz‐Salinas et al , ; Kinnaird et al , ; Munyikwa et al , ; Stang et al , ; Castillo et al , ; King et al , ; Munyikwa and Brown, ; Bateman et al , ; Stone et al , ; Palamakumbura et al , ; Portenga and Bishop, ; Portenga et al , ).…”

Section: Methodsmentioning

confidence: 99%

Landscape preservation under post‐European settlement alluvium in the south‐eastern Australian tablelands, inferred from portable OSL reader data

Portenga

Bishop

Gore

et al. 2016

Earth Surf Processes Landf

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Human land-use changes leading to widespread erosion and gully incision have been well studied, but the effects that erosion and sediment mixing, which accompany the deposition of post-(European) settlement alluvium (PSA), have in valley bottoms and wetlands receive considerably less attention. PSA overlying pre-disturbance swampy meadow (SM) wetland sediments is commonly exposed along incised stream channel gully walls throughout the south-eastern Australian Tablelands, providing an ideal setting in which to assess and understand better how PSA deposition affects valley bottoms and the wetland environments that often occupy them. Portable optically stimulated luminescence (pOSL) reader data were measured on bulk sediment samples from SM-PSA stratigraphies at 16 locations throughout the south-eastern Australian Tablelands to assess the effects of erosion and sediment mixing at the SM-PSA boundary. Trends of pOSL data with depth at each profile were used in conjunction with visual profile descriptions to identify the stratigraphic boundary between SM and PSA sediment and to infer the degree of valley bottom erosion and sediment mixing during PSA deposition. At most sites, SM sediments experienced minimal, if any, disturbance during PSA deposition, and we refer to these as non-eroded sites. Many sites, however, experienced a significant degree of erosion and sediment mixing -eroded sites -often corresponding to visually diffuse sedimentary boundaries between the two stratigraphic units. Our findings demonstrate that SM landscapes in the Tablelands can be preserved with minimal disturbance under PSA at non-eroded sites and are preserved beneath a mixing zone at all eroded sites.

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Section: Methodsmentioning

confidence: 99%

Landscape preservation under post‐European settlement alluvium in the south‐eastern Australian tablelands, inferred from portable OSL reader data

Portenga

Bishop

Gore

et al. 2016

Earth Surf Processes Landf

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“…Advances in geochronological techniques that allow the rapid and economical production of multiple ages for individual moraines will greatly increase the scope of these correlations, particularly if initial data can be collected in the field to guide the sampling protocol (e.g. Stone et al, 2015). However, individual glaciers can respond in a different manner to the same change in climate as neighbouring glaciers in the same catchment.…”

Section: Dating and Interpretation Of Holocene Morainesmentioning

confidence: 99%

The ‘Little Ice Age’ in the Himalaya: A review of glacier advance driven by Northern Hemisphere temperature change

Rowan

2016

The Holocene

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Northern Hemisphere cooling between 1400 and 1900 in the Common Era (CE) resulted in the expansion of glaciers during a period known as the 'Little Ice Age' (LIA). Early investigation of recent advances of Himalayan glaciers assumed that these events were synchronous with LIA advances identified in Europe, based on the appearance and position of moraines and without numerical age control. However, applications of Quaternary dating techniques such as terrestrial cosmogenic nuclide dating have allowed researchers to determine numerical ages for these young moraines and clarify when glacial maxima occurred. This paper reviews geochronological evidence for the last advance of glaciers in the Himalaya. The 66 ages younger than 2000 years (0-2000 CE) calculated from 138 samples collected from glacial landforms demonstrate that peak moraine building occurred between 1300 and 1600 CE, slightly earlier than the coldest period of Northern Hemisphere air temperatures. The timing of LIA advances varied spatially, likely influenced by variations in topography and meteorology across and along the mountain range. Palaeoclimate proxies indicate cooling air temperatures from 1300 CE leading to a southward shift in the Asian monsoon, increased Westerly winter precipitation and generally wetter conditions across the range around 1400 and 1800 CE. The last advance of glaciers in the Himalaya during a period of variable climate resulted from cold Northern Hemisphere air temperatures and was sustained by increased snowfall as atmospheric circulation reorganised in response to cooling during the LIA.

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“…e.g. Stone et al 2015). Ages can also be calculated if dose-rates are known or can be estimated; otherwise at least a relative chronology can be established if dose rates are relatively similar amongst the studied samples.…”

Section: Luminescence Characteristicsmentioning

confidence: 99%

OSLdating and luminescence characteristics of aeolian deposits and their source material in Dalarna, central Sweden

Alexanderson

Bernhardson

2016

Boreas

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Aeolian dunes, coversands, glacifluvial deltas and paraglacial mass‐movement deposits in Bonäsheden and Skattungheden in Dalarna, central Sweden were dated by optically stimulated luminescence (OSL) on quartz. The OSL ages confirm that the majority of the dunes started forming directly after deglaciation, as suggested by previous investigators. Dune formation seems to have lasted at least 1500 years, until c. 9 ka. Four younger episodes of sand drift resulting in coversand deposition were dated by OSL and/or radiocarbon to 4100±200 a, 1569–1412 cal. a BP, 970±60 a and 150±10 a. The youngest one is related to changes in land use, while the older ones may be due to regional climatic changes. The dated quartz had excellent luminescence characteristics; the luminescence was bright and dominated by the fast signal component, which made it possible to successfully analyse even untreated material, so‐called range‐finder dating. These characteristics are most likely inherited from one of the source rocks of the Quaternary deposits – the Mesoproterozoic Dala sandstone, which we show to also have very good luminescence properties.

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Rapid age assessment in the Namib Sand Sea using a portable luminescence reader

Cited by 37 publications

References 29 publications

Landscape preservation under post‐European settlement alluvium in the south‐eastern Australian tablelands, inferred from portable OSL reader data

Landscape preservation under post‐European settlement alluvium in the south‐eastern Australian tablelands, inferred from portable OSL reader data

The ‘Little Ice Age’ in the Himalaya: A review of glacier advance driven by Northern Hemisphere temperature change

OSLdating and luminescence characteristics of aeolian deposits and their source material in Dalarna, central Sweden

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