Sediment instability on the Portuguese continental margin under abrupt glacial climate changes (last 60kyr)

Lebreiro, Susana Martin; Voelker, Antje H L; Vizcaino, Alexis; Abrantes, Fatima F; Alt-Epping, Ulrich; Jung, Simon; Thouveny, Nicolas; Gràcia, Eulália

doi:10.1016/j.quascirev.2009.08.007

Cited by 77 publications

(77 citation statements)

References 80 publications

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“…It is also im- rise (e.g. Paull et al, 1996;Prins et al, 2000;Piper et al, 2003;Lebreiro et al, radiocarbon dates for the Walker-Massingill slide in the Gulf of Mexico. The The first aim is to address the following questions.…”

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confidence: 99%

“…Large amounts of sediments 152 locked up in these ice sheets are released by meltwater discharge pulses during 153 deglaciation (Lebreiro et al, 2009;Toucanne et al, 2012). At most mid-latitude 154 continental margins deposition rates are thus highest at the end of a glacial, i.e.…”

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confidence: 99%

“…Canyon levee system turbidites 427 (e.g. Lebreiro et al, 2009;Henrich et al, 2010) are likely dominated by river 428 input and are thus omitted here. …”

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confidence: 99%

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Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Urlaub¹,

Talling²,

Masson³

2013

Quaternary Science Reviews

168

164

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Large submarine landslides can have serious socioeconomic consequences as they have the potential to cause tsunamis and damage seabed infrastructure. It is important to understand the frequency of these landslides, and how that frequency is related to climate-driven factors such as sea level or sedimentation rate, in order to assess their occurrence in the future. Recent studies have proposed that more landslides occur during periods of sea level rise and lowstand, or during periods of rapid sedimentation. In this contribution we test these hypotheses by analysing the most comprehensive global data set of ages for large (> 1km 3 ) late Quaternary submarine landslides that has been compiled to date. We include the uncertainties in each landslide age that arise from both the dating technique, and the typically larger uncertainties that result from the position of the samples used for dating. Contrary to the hypothesis that continental slope stability is linked to sea level change, the data set does not show statistically significant patterns, trends or clusters in landslide abundance. If such a link between sea level and landslide frequency exists it is too weak to be detected using the available global data base. It is possible that controlling factors vary between different geographical areas, and their role is therefore hidden * Corresponding author Email address: m.urlaub@noc.soton.ac.uk (Morelia Urlaub)Preprint submitted to Elsevier March 1, 2013in a global data set, or that the uncertainties within the dates is too great to see an underlying correlation. Our analysis also shows that there is no evidence for an immediate influence of rapid sedimentation on slope stability as failures tend to occur several thousand years after periods of increased sedimentation rates. The results imply that there is not a strong global correlation of landslide frequency with sea level changes or increases in local sedimentation rate, based on the currently available ages for large submarine landslides.

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confidence: 99%

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confidence: 99%

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Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Urlaub¹,

Talling²,

Masson³

2013

Quaternary Science Reviews

168

164

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“…High sedimentation rates are typical in this region because of elevated fluxes in both glacial (clay) and interglacial (silt) material; however, distinct climate control results in enhanced sedimentation during colder periods at both orbital and millennial timescales. This pattern is observed in water depths between 2500 and 4600 m (Hall and McCave, 2000;Lebreiro et al, 2009). Detrital input from rivers (Tagus) channeled by turbidity currents is limited to submarine canyon systems (Lebreiro et al, 2009) and abyssal plains (Lebreiro et al, 1997) and does not affect open slope deposition.…”

Section: Morphosedimentary and Stratigraphic Frameworkmentioning

confidence: 86%

“…This pattern is observed in water depths between 2500 and 4600 m (Hall and McCave, 2000;Lebreiro et al, 2009). Detrital input from rivers (Tagus) channeled by turbidity currents is limited to submarine canyon systems (Lebreiro et al, 2009) and abyssal plains (Lebreiro et al, 1997) and does not affect open slope deposition. Ice-rafted detritus occasionally reached the Iberian margin during the last glacial period, especially during Heinrich events, when sea-surface temperatures were very low (Lebreiro et al, 1996;Baas et al, 1997;Cayre et al, 1999;Thouveny et al, 2000;de Abreu et al, 2003).…”

Section: Morphosedimentary and Stratigraphic Frameworkmentioning

confidence: 86%

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2012

IODP Preliminary Report

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Regional and global benthic δ¹⁸O stacks for the last glacial cycle

2016

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Although detailed age models exist for some marine sediment records of the last glacial cycle (0–150 ka), age models for many cores rely on the stratigraphic correlation of benthic δ18O, which measures ice volume and deep ocean temperature change. The large amount of data available for the last glacial cycle offers the opportunity to improve upon previous benthic δ18O compilations, such as the “LR04” global stack. Not only are the age constraints for the LR04 stack now outdated but a single global alignment target neglects regional differences of several thousand years in the timing of benthic δ18O change during glacial terminations. Here we present regional stacks that characterize mean benthic δ18O change for 8 ocean regions and a volume‐weighted global stack of data from 263 cores. Age models for these stacks are based on radiocarbon data from 0 to 40 ka, correlation to a layer‐counted Greenland ice core from 40 to 56 ka, and correlation to radiometrically dated speleothems from 56 to 150 ka. The regional δ18O stacks offer better stratigraphic alignment targets than the LR04 global stack and, furthermore, suggest that the LR04 stack is biased 1–2 kyr too young throughout the Pleistocene. Finally, we compare global and regional benthic δ18O responses with sea level estimates for the last glacial cycle.

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Sediment instability on the Portuguese continental margin under abrupt glacial climate changes (last 60kyr)

Cited by 77 publications

References 80 publications

Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

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Regional and global benthic δ¹⁸O stacks for the last glacial cycle

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Sediment instability on the Portuguese continental margin under abrupt glacial climate changes (last 60kyr)

Cited by 77 publications

References 80 publications

Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Timing and frequency of large submarine landslides: implications for understanding triggers and future geohazard

Untitled

Regional and global benthic δ18O stacks for the last glacial cycle

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Product

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Regional and global benthic δ¹⁸O stacks for the last glacial cycle