Laminated sediments preceding Heinrich event 1 in the Northern North Sea and Southern Norwegian Sea: Origin, processes and regional linkage

Lekens, W; Sejrup, Hans Petter; Haflidason, Haflidi; Petersen, G. O.; Hjelstuen, Berit Oline; Knorr, Gregor

doi:10.1016/j.margeo.2004.12.007

Cited by 89 publications

(96 citation statements)

References 93 publications

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“…ca 10 kyr after its diversion towards the Bay of Biscay. The strong increase of the Fleuve Manche activity from ca 20 ka which is contemporaneous with the significant retreat of the FIS from its maximum extent (Marks, 2002;Vorren and Plassen, 2002;Dahlgren and Vorren, 2003;Nygard et al, 2004;Lekens et al, 2005;Rinterknecht et al, 2006;Knies et al, 2007;Goehring et al, 2008;Krohn et al, 2009) confirms the close relationship between the Fleuve Manche and the FIS. Moreover, it confirms the southwards flow of the Elbe-Weser system until the end of the last glacial period.…”

Section: Chronology Of the Late Pleistocene Southwards Routing Of Bismentioning

confidence: 53%

The first estimation of Fleuve Manche palaeoriver discharge during the last deglaciation: Evidence for Fennoscandian ice sheet meltwater flow in the English Channel ca 20–18 ka ago

Toucanne

Zaragosi

Bourillet

et al. 2010

Earth and Planetary Science Letters

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Abstract:The Fleuve Manche (English Channel) palaeoriver represents the largest river system that drained the European continent during Pleistocene lowstands, particularly during the Elsterian (Marine Isotope Stage 12) and Saalian Drenthe (MIS 6) glaciations when extensive ice advances into the North Sea area forced the central European rivers to flow southwards to the Bay of Biscay (NE Atlantic). Numerous long piston cores and high-resolution acoustic data from the northern Bay of Biscay have been correlated using a well-constrained chronostratigraphical framework, and for the first time allow the estimation of the discharge of the Fleuve Manche palaeoriver at the end of the last glacial period (i.e. Weichselian). Our results, discussed in the light of relationships between river loads and drainage area characteristics, strongly suggest that the Bay of Biscay collected sediment-laden meltwater from the Northern European lowlands and the southern part of the Fennoscandian ice sheet at the end of the last glacial period and particularly during the paroxysmal phase of the European deglaciation ca 20-18 ka ago. This demonstrates that the Fleuve Manche drainage area at that time was equivalent to those dating from the major Elsterian and Saalian Drenthe glaciations. Based on our data, we propose a revision of the palaeogeographical and palaeoglaciological evolution of the North Sea area while showing that the British and Fennoscandian ice sheets entered the North Sea basin until ca 18 ka initiating isostatic adjustment of the basin. This allowed the North Sea fluvial system to flow southwards through the Dover Strait. Finally, we discuss the Fleuve Manche freshwater discharge during the maximum European ice sheet retreat ca 18 ka. The estimated discharge at this time appears important and sufficiently sustained to possibly contribute to the profound destabilisation of the thermohaline circulation recognised in the North Atlantic from ca 18 to 16 ka.

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Section: Chronology Of the Late Pleistocene Southwards Routing Of Bismentioning

confidence: 53%

The first estimation of Fleuve Manche palaeoriver discharge during the last deglaciation: Evidence for Fennoscandian ice sheet meltwater flow in the English Channel ca 20–18 ka ago

Toucanne

Zaragosi

Bourillet

et al. 2010

Earth and Planetary Science Letters

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“…The strong increase of the 'Fleuve Manche' activity from ca. 18.3 ka occurred at time of important environmental changes in the north and north-western British ice margin (Knutz et al, 2002a;Knutz et al, 2002b;Wilson et al, 2002;Hall et al, 2006), contemporaneous with the maximum decay of the FIS (Svendsen et al, 1996;Kleiber et al, 2000;Vorren and Plassen, 2002;Dahlgren and Vorren, 2003;Nygard et al, 2004;Lekens et al, 2005;Knies et al, 2007;Rinterknetch et al, 2007;Goehring et al, 2008), reinforcing the idea that the 'Fleuve Manche' activity was strongly dependent on the surrounding ice-sheet runoff. As a result, the 'Fleuve Manche' was a glacially-fed river and the Bay of Biscay was a depocentre for the European ice sheets erosional products, whose accumulations are still widely visible all along the southern margins of the past FIS (Eissmann, 2002;Houmark-Nielsen and Kjaer, 2003; and BIIS (Eyles and McCabe, 1989;Bowen et al, 2002;Evans and O'Cofaigh, 2003).…”

Section: Resultsmentioning

confidence: 84%

“…For the last glacial period, the huge 'Fleuve Manche' discharges dating from ca. 18 ka correlate with significant freshwater fluxes from the circum-North Atlantic ice sheets, as reported from the FIS (Kleiber et al, 2000;Dahlgren and Vorren, 2003;Lekens et al, 2005;Rasmussen et al, 2007), the BIIS (Zaragosi et al, 2001;Hall et al, 2006;Ménot et al, 2006;Toucanne et al, 2008) and the LIS (Clarke et al, 1999;Tripsanas and Piper, 2008), indicating that the 'Fleuve Manche' activity reflected a large-scale event of meltwater releases. Geochemical and isotopical data from numerous cores from the North Atlantic show a sharp concomitant decrease in the rate of deep-water formation leading to the HE 1 and a collapsed THC until ca.…”

Section: Comments On the Timing Of Major 'Fleuve Manche' Discharges Amentioning

confidence: 73%

“…Laminated sediments have been identified from many localities on the NW European margin during MIS 2 (e.g. Dahlgren and Vorren, 2003;Lekens et al, 2005), but those described from the Armoricain margin appear markedly different, even unique in the context of open-ocean environments (see O'Cofaigh and Dowdeswell (2001) for a thorough review). The facies studied mainly consists of millimetre to centimetre-scale layers of ungraded mud layers alternating with millimetre-scale layers of IRD-rich mud (Zaragosi et al, 2001), the repeated alternation of massive mud and IRD-rich layers imparting the laminated appearance (Fig.…”

Section: Genetic Interpretation Of Laminated Sediments and Palaeoenvimentioning

confidence: 99%

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Timing of massive ‘Fleuve Manche’ discharges over the last 350kyr: insights into the European ice-sheet oscillations and the European drainage network from MIS 10 to 2

Toucanne

Zaragosi

Bourillet

et al. 2009

Quaternary Science Reviews

188

234

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“…Nearly all the suspended material is deposited within a few kilometres of the outlet 27 . Several observations have shown that sediments settling from meltwater plumes (plumites) are often laminated and deposited at high sedimentation rates 12,22,28,29 .…”

Section: Discussionmentioning

confidence: 99%

Pink marine sediments reveal rapid ice melt and Arctic meltwater discharge during Dansgaard–Oeschger warmings

Rasmussen

Thomsen

2013

Nat Commun

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The climate of the last glaciation was interrupted by numerous abrupt temperature fluctuations, referred to as Greenland interstadials and stadials. During warm interstadials the meridional overturning circulation was active transferring heat to the north, whereas during cold stadials the Nordic Seas were ice-covered and the overturning circulation was disrupted. Meltwater discharge, from ice sheets surrounding the Nordic Seas, is implicated as a cause of this ocean instability, yet very little is known regarding this proposed discharge during warmings. Here we show that, during warmings, pink clay from Devonian Red Beds is transported in suspension by meltwater from the surrounding ice sheet and replaces the greenish silt that is normally deposited on the north-western slope of Svalbard during interstadials. The magnitude of the outpourings is comparable to the size of the outbursts during the deglaciation. Decreasing concentrations of ice-rafted debris during the interstadials signify that the ice sheet retreats as the meltwater production increases.

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Laminated sediments preceding Heinrich event 1 in the Northern North Sea and Southern Norwegian Sea: Origin, processes and regional linkage

Cited by 89 publications

References 93 publications

The first estimation of Fleuve Manche palaeoriver discharge during the last deglaciation: Evidence for Fennoscandian ice sheet meltwater flow in the English Channel ca 20–18 ka ago

The first estimation of Fleuve Manche palaeoriver discharge during the last deglaciation: Evidence for Fennoscandian ice sheet meltwater flow in the English Channel ca 20–18 ka ago

Timing of massive ‘Fleuve Manche’ discharges over the last 350kyr: insights into the European ice-sheet oscillations and the European drainage network from MIS 10 to 2

Pink marine sediments reveal rapid ice melt and Arctic meltwater discharge during Dansgaard–Oeschger warmings

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