Luminescence dating of hillslope deposits—A review

Fuchs, Markus; Lang, Andreas

doi:10.1016/j.geomorph.2008.08.025

Cited by 108 publications

(68 citation statements)

References 76 publications

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“…OSL dating has frequently been used to determine chronologies of hillslope deposits (e.g. Lang, 1994;Fuchs and Lang, 2009). Here we utilised a singlealiquot, regenerative-dose protocol (Murray and Wintle, 2000) on fine-grained quartz (4-15 µm).…”

Section: Sediment Chronologymentioning

confidence: 99%

The fate of buried organic carbon in colluvial soils: a long-term perspective

et al. 2014

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Abstract. Colluvial soils are enriched in soil organic carbon (SOC) in comparison to the soils of upslope areas due to the deposition and progressive burial of SOC. This burial of SOC has important implications for the global carbon cycle, but the long-term dynamics of buried SOC remain poorly constrained. We addressed this issue by determining the SOC burial efficiency (i.e. the fraction of originally deposited SOC that is preserved in colluvial deposits) of buried SOC as well as the SOC stability in colluvial soils. We quantified the turnover rate of deposited SOC by establishing sediment and SOC burial chronologies. The SOC stability was derived from soil incubation experiments and the δ 13 C values of SOC. The C burial efficiency was found to decrease with time, reaching a constant ratio of approximately 17 % by about 1000-1500 yr post-burial. This decrease is attributed to the increasing recalcitrance of the remaining buried SOC with time and a less favourable environment for SOC decomposition with increasing depth. Buried SOC in colluvial profiles was found to be more stable and degraded in comparison to SOC sampled at the same depth at a stable reference location. This is due to the preferential mineralisation of the labile fraction of the deposited SOC. Our study shows that SOC responds to burial over a centennial timescale; however, more insight into the factors controlling this response is required to fully understand how this timescale may vary, depending on specific conditions such as climate and depositional environment.

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Section: Sediment Chronologymentioning

confidence: 99%

The fate of buried organic carbon in colluvial soils: a long-term perspective

et al. 2014

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“…Nevertheless, the dates do support the soil observations that the alluvial fill event that comprises this terrace formed in the late Pleistocene. Considering that OSL dates are maximum ages because of the inheritance issue (Fuchs & Lang 2008), the likely age of the fill event is c. 16 ka or younger.…”

Section: Vale Meão Winery Sitementioning

confidence: 99%

Palaeoseismology of the Vilariça Segment of the Manteigas-Bragança Fault in northeastern Portugal

Rockwell¹,

Fonseca

Madden³

et al. 2009

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The Manteigas-Bragança fault is a major, 250-km-long, NNE-striking, sinistral strike-slip structure in northern Portugal. This fault has no historical seismicity for large earthquakes, although it may have generated moderate (M5þ) earthquakes in 1751 and 1858. Evidence of continued left horizontal displacement is shown by the presence of Cenozoic pull-apart basins as well as late Quaternary stream deflections. To investigate its recent slip history, a number of trenches were excavated at three sites along the Vilariça segment, north and south of the Douro River. At one site at Vale Meão winery, the occurrence of at least two and probably three events in the past 14.5 ka was determined, suggesting an average return period of about 5-7 ka. All three events appear to have occurred as a cluster in the interval between 14.5 and 11 ka, or shortly thereafter, suggesting a return period of less than 2 ka between events within the cluster. In the same area, a small offset rill suggests 2 -2.5 m of slip in the most recent event and about 6.1 m after incision below a c. 16 ka alluvial fill event along the Douro River. At another site along the Vilariça River alluvial plain, NE of the Vale Meão site, several trenches were excavated in late Pleistocene and Holocene alluvium, and exposed the fault displacing channel deposits dated to between 18 and 23 ka. In a succession of closely spaced parallel cuts and trenches, the channel riser was traced into and across the fault to resolve c. 6.5 m of displacement after 18 ka and c. 9 m of slip after c. 23 ka. These observations yield a slip rate of 0.3-0.5 mm/a, which is consistent with earlier estimates. Combining the information on timing at Vale Meão winery and displacement at Vilariça argues for earthquakes in the M7þ range, with coseismic displacements of 2 -3 m. This demonstrates that there are potential seismic sources in Portugal that are not associated with the 1755 Lisbon earthquake or the Tagus Valley, and, although rare, large events on the Vilariça fault could be quite destructive for the region. This work provides an analogue for the study of active faulting in intracontinental settings and supports the view that earthquakes within intracontinental settings tend to cluster in time. In addition, this study highlights the usefulness and application of multiple field, remote sensing and geochronological techniques for seismic hazard mitigation.

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“…The older OSL ages could be a result of incomplete bleaching of water-borne sediments over short distances (e.g. Prasad and Gupta, 1999;Fuchs and Lang, 2009;Baartman et al, 2011). We have therefore not considered OSL ages for stratigraphic correlation or intercomparison.…”

Section: Chronologymentioning

confidence: 99%