Preserving the palaeoenvironmental record in Drylands: Bioturbation and its significance for luminescence-derived chronologies

Bateman, Mark D.; Boulter, Claire; Carr, Andrew S.; Frederick, Charles D.; Peter, Duane E.; Wilder, Michael

doi:10.1016/j.sedgeo.2006.07.003

Cited by 136 publications

(68 citation statements)

References 36 publications

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“…the conveyor belt model. Significant vertical mixing from deeper (non-zeroed) or surface (0-age) sources would give less well-bleached distributions, and so larger differences between IEU, CAM and multi-grain doses and a non-linear CAM age relationship with depth (Bateman et al, 2007b). The latter would also be expected if significant post-depositional mining in unit II took place.…”

Section: Discussionmentioning

confidence: 99%

“…The current study sought to investigate a corresponding simple terrestrial ecosystem, with only one dominant bioturbating agent. Besides the obvious gains in ecosystem understanding, this study allows us to test the applicability of OSL in bioturbation studies, a major challenge for the luminescence community (Bateman et al, 2003;2007a;2007b).…”

Section: Introductionmentioning

confidence: 99%

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Quantification of termite bioturbation in a savannah ecosystem: Application of OSL dating

Kristensen

Thomsen

Murray

et al. 2015

Quaternary Geochronology

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Luminescence dating is one of the most promising techniques available for studying bioturbation on pedological timescales. In this study, we use multi-grain and single-grain quartz OSL to quantify termite bioturbation processes (Macrotermes natalensis) in a savannah ecosystem in Ghana. Termites transport soil from depth to the surface to construct termitaria. Over time, erosion levels these mounds and returns the sediment to the soil surface. These two processes of construction and erosion together represent an upward "conveyor belt" sediment transport process. We find that the sediment is effectively bleached during the erosion process allowing us to quantify retrospectively, for the first time, the surface deposition rate, the inverse of the upwards transport rate. At this site, this is ~0.28 mm year -1 and began about 4.000 years ago.Downward mixing through subsurface galleries may replace 10-20 % of the volume ka -1 below the unit formed by reburied termite deposits.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of termite bioturbation in a savannah ecosystem: Application of OSL dating

Kristensen

Thomsen

Murray

et al. 2015

Quaternary Geochronology

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“…Roberts et al, 2000Roberts et al, , 2001Jacobs et al, 2006Jacobs et al, , 2008bDavid et al, 2007;Bateman et al, 2007b).…”

Section: The Sources Of Uncertainty and Scatter Of D E Estimatementioning

confidence: 99%

Employing Minimum age model (MAM) and Finite mixture modeling (FMM) for OSL age determination of two important samples from Ira Trench of North Tehran Fault

2016

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Ira trench site is in a point where, the surface trace of North Tehran Fault (NTF) joins the Mosha Fault (MF) in the north-eastern margin of Tehran and can provide important paleosismological information for Tehran. The Ira trench, were divided into 6 packages (I to VI), described, according to their composition, relative and absolute ages. Package I consists of units 23, 25, 26, 27, 28, 29, 30 and 31. The whole package I mainly belongs to Holocene, and provides essential constraints for the recent paleo-earthquake activity of the EMF and NTF zone. Therefore, finding accurate ages for the units of this package is very important. Three colluvial wedges (units 23, 26, 28) are present between 20 and 36.5 m north in package I, which are assigned to 3 episodes of activity on Fault 13. Central age model (CAM) provided OSL ages of 35.0 ± 6.1, 7.3 ± 1.3, 6.4 ± 0.9 and 56 ± 6.5 ka for units 23, 26, 28 and 29, respectively. The conflicting ages of 56 ± 6.5 and 35.0 ± 6.1 ka (for units 23 and 29, respectively) as compared to the underlying younger units suggest that these ages are overestimated. MAM provided OSL ages of 13.1 ± 4.3 and 3.5 ± 0.4 ka for units 23 and 29, respectively. The contribution of the new statistical age model of sample IRA4 to the paleoseismic data is discussed.

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“…Bioturbated horizons should also be avoided to obtain ages of sediment deposition as roots and animals can mix surface grains exposed to sunlight with grains buried during sedimentation. Despite sometimes are difficult to recognize a bioturbated deposit, OSL dating has been used to recognize post-depositional disturbance (Bateman et al 2007, Bueno et al 2012. The influence radius of gamma radiation from natural radionuclides is about 30 cm in sediments.…”

Section: Studied Locationsmentioning

confidence: 99%

Luminescence characteristics of quartz from Brazilian sediments and constraints for OSL dating

Guedes

Sawakuchi

Giannini

et al. 2013

An. Acad. Bras. Ciênc.

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This study analyzes the optically stimulated luminescence (OSL) characteristics of quartz grains from fluvial, eolian and shallow marine sands of northeastern and southeastern Brazil, with especial focus on the applicability of the single-aliquot regenerative dose (SAR) dating protocol. All analyzed Brazilian sediments presented relatively high OSL sensitivity and good behavior regarding their luminescence characteristics relevant for radiation dose estimation. However, some samples from the Lençóis Maranhenses region in northeastern Brazil showed inadequate OSL sensitivity correction, hampering the implementation of the SAR protocol and their ability to behave as a natural dosimeter. While the shallow marine and eolian samples showed a narrow and reliable dose distribution, the fluvial sample had a wide dose distribution, suggesting incomplete bleaching and natural doses estimates dependent on age models.

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Preserving the palaeoenvironmental record in Drylands: Bioturbation and its significance for luminescence-derived chronologies

Cited by 136 publications

References 36 publications

Quantification of termite bioturbation in a savannah ecosystem: Application of OSL dating

Quantification of termite bioturbation in a savannah ecosystem: Application of OSL dating

Employing Minimum age model (MAM) and Finite mixture modeling (FMM) for OSL age determination of two important samples from Ira Trench of North Tehran Fault

Luminescence characteristics of quartz from Brazilian sediments and constraints for OSL dating

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