Confirming geomorphological interpretations based on portable OSL reader data

Portenga, Eric W.; Bishop, Paul

doi:10.1002/esp.3834

Cited by 26 publications

(48 citation statements)

References 27 publications

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“…The key conclusion from their work is that the upstream soils developed over metasedimentary rocks have low total photon counts and are not likely sources for post‐colonization deposits with higher total photon counts as sediment transport downstream should either decrease or keep the total photon counts constant with transport distance. The findings of Muñoz‐Salinas et al () were later shown to be reproducible by data given by Portenga and Bishop (), who agreed with interpretations by Muñoz‐Salinas et al (). Portenga et al () would later expand the Muñoz‐Salinas et al () approach to various other regional sites allowing for a wider‐scale interpretation of river basin change.…”

Section: Luminescence As a Provenance Toolsupporting

confidence: 74%

Luminescence as a Sediment Tracer and Provenance Tool

Gray

Jain

Sawakuchi

et al. 2019

Reviews of Geophysics

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Luminescence holds unique potential as a sediment tracer and provenance method. The tracer application of luminescence has key advantages including ease of measurement, relatively low cost, and applicability to geologically ubiquitous quartz and feldspar sand and silt. These advantages can help answer fundamental questions about geomorphology, sediment transport, sediment production, and the tectonic/climatic controls on source‐to‐sink sedimentary systems. There is a notable body of research on luminescence as a sediment tracer. These tracer methods range from identifying source locations based on unique luminescence characteristics, to observing changes in luminescence characteristics with transport, to using residual luminescence to infer rates of transport. Previous applications of luminescence include provenance and quantification of fluvial transport rate, tracing of coastal longshore drift, estimations of mixing rates in soil or sediment, and provenance of wind‐blown deposits. The few studies that compare luminescence methods with nonluminescence tracer methods show good agreement. However, more work is needed to test the application of luminescence tracers in sediments. Future research directions should focus on comparing luminescence‐based with nonluminescence tracer methods. Furthermore, research is needed on the effects of specific geomorphic processes on luminescence characteristics and residual doses. While there is significant potential for future research, luminescence is already a useful sediment tracer and provenance tool applicable to a wide range of geomorphic environments.

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Section: Luminescence As a Provenance Toolsupporting

confidence: 74%

Luminescence as a Sediment Tracer and Provenance Tool

Gray

Jain

Sawakuchi

et al. 2019

Reviews of Geophysics

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“…The depth trends of bulk OSL data through PSA and SM sediments at Birchams Creek resemble SM and SM‐PSA profiles found elsewhere in the Tablelands [ Muñoz‐Salinas et al ., ; Portenga et al ., ] (Figure a); we note, however, that SM sediments at ~90 cm deep at site SM‐1 show a substantial decrease in bulk OSL that is not observed in SM sediment profiles elsewhere in the Tablelands [ Portenga and Bishop , ]. Without further sampling or deriving ages throughout the SM‐1 profile, we can only speculate that this decrease may represent a former valley bottom surface.…”

Section: Discussionmentioning

confidence: 99%

“…PSA deposits throughout the Tablelands were transported and deposited by floods; the higher bulk OSL measurements at the base of PSA compared to those in the uppermost SM sediments indicate that PSA was minimally bleached before deposition and that peak bulk OSL measurements reflect bulk OSL from the PSA source material [Muñoz-Salinas et al, 2014;Portenga and Bishop, 2016;Portenga et al, 2016a]. Thus, to be considered as a reasonable source for PSA, potential sources of PSA (e.g., SM-1 and VF-1) must contain sediment with bulk OSL values greater than or equal to the bulk OSL maxima of PSA deposits (e.g., PSA-1 and PSA-2; Figure 5a).…”

Section: Identifying Psa Source Locations and Depthsmentioning

confidence: 99%

Combining bulk sediment OSL and meteoric¹⁰Be fingerprinting techniques to identify gully initiation sites and erosion depths

et al. 2017

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Deep erosional gullies dissect landscapes around the world. Existing erosion models focus on predicting where gullies might begin to erode, but identifying where existing gullies were initiated and under what conditions is difficult, especially when historical records are unavailable. Here we outline a new approach for fingerprinting alluvium and tracing it back to its source by combining bulk sediment optically stimulated luminescence (bulk OSL) and meteoric 10Be (10Bem) measurements made on gully‐derived alluvium samples. In doing so, we identify where gully erosion was initiated and infer the conditions under which such erosion occurred. As both 10Bem and bulk OSL data have distinctive depth profiles in different uneroded and depositional settings, we are able to identify the likely incision depths in potential alluvium source areas. We demonstrate our technique at Birchams Creek in the southeastern Australian Tablelands—a well‐studied and recent example of gully incision that exemplifies a regional landscape transition from unchanneled swampy meadow wetlands to gully incision and subsequent wetland burial by post‐European settlement alluvium. We find that such historic alluvium was derived from a shallow erosion of valley fill upstream of former swampy meadows and was deposited down the center of the valley. Incision likely followed catchment deforestation and the introduction of livestock, which overgrazed and congregated in valley bottoms in the early 20th century during a period of drought. As a result, severe gully erosion was likely initiated in localized, compacted, and oversteepened reaches of the valley bottom.

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“…Creek, Australia (Portenga & Bishop 2015), as well as for sediments trapped in reservoirs (e.g. Bishop et al 2010 in the Baldernock Mill dam, Scotland).…”

Section: And In Grabben Gullenmentioning

confidence: 95%

“…Several studies have employed a PPSL reader in fluvial settings to study how luminescence signals in alluvium and debrisflows change within river basins around the world (e.g. Muñoz-Salinas et al 2011a, b, 2013, 2016 and in Grabben Gullen Creek, Australia (Portenga & Bishop 2015), as well as for sediments trapped in reservoirs (e.g. Bishop et al 2010 in the Baldernock Mill dam, Scotland).…”

mentioning

confidence: 99%

OSLsignal resetting in young deposits determined with a pulsed photon‐stimulated luminescence (PPSL) unit

Muñoz‐Salinas

Castillo

Arce

2016

Boreas

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J. L. 2017 (April): OSL signal resetting in young deposits determined with a pulsed photon-stimulated luminescence (PPSL) unit.Optical Stimulated Luminescence (OSL) is a technique that can be used for dating geological materials deposited within the last half-million years, including sediments transported by air, water or gravity, as well as rocks heated at high temperatures. Recently, several studies have shown that OSL can also provide information on sediment transport. The pulsed photon-stimulated luminescence (PPSL) unit (also known as a portable OSL reader) developed by the Scottish Universities Environmental Research Centre is an instrument designed to read luminescence signals from bulk (untreated) sediment samples comprising poly-mineral and poly-grain fractions. In this contribution, we evaluate the potential of the PPSL unit to assess the degree of OSL signal resetting in 27 young deposits (<2 ka) transported by different geomorphic agents in volcanic, coastal and fluvial depositional settings located in Mexico. Our results are in agreement with previous findings that used the Risø TL/OSL reader, confirming that sediments transported by debrisflows contain the highest inherited luminesce signals. Infrared stimulation (IRSL) values in volcanic ash, lavas, and sand beach and dune deposits exhibit low scatter. However, with blue stimulation (BLSL) these samples reveal a large degree of scattering, attributed to charge transfer in the case of the coastal deposits and to the low sensitivity of quartz in the case of volcanic material. The luminescence signals of fluvial sediments exhibit a highly scattered distribution in both IRSL and BLSL. We conclude that the use of a PPSL unit is a simple approach to assess the degree of OSL signal resetting in deposits sourced from different geological environments. This research contributes to previous studies that have investigated new applications of the PPSL unit to assist in OSL dating of geological materials.

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Confirming geomorphological interpretations based on portable OSL reader data

Cited by 26 publications

References 27 publications

Luminescence as a Sediment Tracer and Provenance Tool

Luminescence as a Sediment Tracer and Provenance Tool

Combining bulk sediment OSL and meteoric¹⁰Be fingerprinting techniques to identify gully initiation sites and erosion depths

OSLsignal resetting in young deposits determined with a pulsed photon‐stimulated luminescence (PPSL) unit

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Confirming geomorphological interpretations based on portable OSL reader data

Cited by 26 publications

References 27 publications

Luminescence as a Sediment Tracer and Provenance Tool

Luminescence as a Sediment Tracer and Provenance Tool

Combining bulk sediment OSL and meteoric10Be fingerprinting techniques to identify gully initiation sites and erosion depths

OSLsignal resetting in young deposits determined with a pulsed photon‐stimulated luminescence (PPSL) unit

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Combining bulk sediment OSL and meteoric¹⁰Be fingerprinting techniques to identify gully initiation sites and erosion depths