Growth history of a cold-water coral covered carbonate mound — Galway Mound, Porcupine Seabight, NE-Atlantic

Eisele, Markus Hermann; Hebbeln, Dierk; Wienberg, Claudia

doi:10.1016/j.margeo.2008.05.006

Cited by 74 publications

(53 citation statements)

References 48 publications

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“…Dating of coral fragments has revealed that the past 11 ka are in general favorable for coral growth. Older coral reef growth episodes occurred during previous climate warm stages such as marine isotope stage 5 and 7 (Rüggeberg et al, 2003;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009) (Table 2). Mound records are thus often discontinuous in particular between coral growth intervals and in many cases glacial sedimentation is missing or almost absent (Rüggeberg et al, 2003;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Older coral reef growth episodes occurred during previous climate warm stages such as marine isotope stage 5 and 7 (Rüggeberg et al, 2003;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009) (Table 2). Mound records are thus often discontinuous in particular between coral growth intervals and in many cases glacial sedimentation is missing or almost absent (Rüggeberg et al, 2003;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009). Yet, no corals of glacial environments have been discovered on and off mounds in Porcupine Seabight and on SW Rockall Bank (Rüggeberg et al, 2003;Schröder-Ritzrau et al, 2005;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Mound records are thus often discontinuous in particular between coral growth intervals and in many cases glacial sedimentation is missing or almost absent (Rüggeberg et al, 2003;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009). Yet, no corals of glacial environments have been discovered on and off mounds in Porcupine Seabight and on SW Rockall Bank (Rüggeberg et al, 2003;Schröder-Ritzrau et al, 2005;Dorschel et al, 2005;Frank et al, 2005;Kano et al, 2007;Rüggeberg et al, 2007;Eisele et al, 2008;Mienis et al, 2009). Our results largely reinforce the scares previous observations but we further achieved a time resolution allowing the study of secular variations of coral growth on mounds during the most recent period of mound development: the Holocene.…”

Section: Discussionmentioning

confidence: 99%

“…1c). Today, this mound is covered by dead coral rubble in contrast to the flourishing coral ecosystems recorded on Thérèse Mound (Olu Le-Roy, 2004;de Mol et al, 2007) and Galway Mound (Foubert et al, 2005;Eisele et al, 2008) situated nearby but at deeper depth (Williams et al, 2006). The core was taken on the north-western tip of the summit off the mound flank facing the northward moving currents and it is situated next to the site of recent IODP drilling 307 (Fig.…”

Section: Core Locationsmentioning

confidence: 99%

“…It further allows measuring the timing above and below hiatuses often invisible in the sedimentary record (Rüggeberg et al, 2003;Dorschel et al, 2005;Frank et al, 2005;Rüggeberg et al, 2007;Eisele et al, 2008). Finally, dating provides a direct measure of the timing of open framework construction and thus reveals periods favourable of coral growth i.e.…”

Section: Introductionmentioning

confidence: 99%

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The Holocene occurrence of cold water corals in the NE Atlantic: Implications for coral carbonate mound evolution

et al. 2009

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U-series dating of constructional cold-water corals is a powerful tool to reconstruct the evolution of corals on carbonate mounds. Here we have investigated the time framework of corals such as Lophelia pertusa and Madrepora oculata on five different mound settings of the eastern North Atlantic (on Rockall Bank and in Porcupine Seabight), sampled at variable depth and location (610-880 m water depth). We have found that the past 11 ka reflect a period generally favourable for coral development. We further determined local mound growth rates and identified mound surface erosion (framework collapse) during times of active coral framework construction. "Local" vertical mound growth rates vary between less than 5 cm ka − 1 and up to 220 cm ka − 1 . We interpret rates exceeding 15 cm ka − 1 as representative of densely populated coral reefs. During times of reduced or absent coral development, mound evolution rates are by far smaller (0 to < 5 cm ka − 1 ). The time resolution achieved here furthermore provides first evidence for reduced coral (ecosystem) activity at 1.8-2.0 ka, 4.2-4.8 ka and between 6 and 8.2 ka within the Holocene that may be related to climate driven changes of the coral growth environments. During Glacial periods coral growth in those areas seems apparently extremely reduced or is even absent on mounds.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Core Locationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Holocene occurrence of cold water corals in the NE Atlantic: Implications for coral carbonate mound evolution

et al. 2009

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Paleoseawater density reconstruction and its implication for cold‐water coral carbonate mounds in the northeast Atlantic through time

et al. 2016

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Carbonate buildups and mounds are impressive biogenic structures throughout Earth history.In the recent NE Atlantic, cold-water coral (CWC) reefs form giant carbonate mounds of up to 300 m of elevation. The expansion of these coral carbonate mounds is paced by climatic changes during the past 2.7 Myr. Environmental control on their development is directly linked to controls on its main constructors, the reef-building CWCs. Seawater density has been identified as one of the main controlling parameter of CWC growth in the NE Atlantic. One possibility is the formation of a pycnocline above the carbonate mounds, which is increasing the hydrodynamic regime, supporting elevated food supply, and possibly facilitating the distribution of coral larvae. The potential to reconstruct past seawater densities from stable oxygen isotopes of benthic foraminifera has been further developed: a regional equation gives reliable results for three different settings, peak interglacials (e.g., Holocene), peak glacials (e.g., Last Glacial Maximum), and intermediate setting (between the two extremes). Seawater densities are reconstructed for two different NE Atlantic CWC carbonate mounds in the Porcupine Seabight indicating that the development of carbonate mounds is predominantly found at a seawater density range between 27.3 and 27.7 kg m À3 (σ Θ notation). Comparable to recent conditions, we interpret the reconstructed density range as a pycnocline serving as boundary layer, on which currents develop, carrying nutrition and possibly coral larvae. The close correlation of CWC reef growth with reconstructed seawater densities through the Pleistocene highlights the importance of pycnoclines and intermediate water mass dynamics.

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Environmental constraints on Holocene cold‐water coral reef growth off Norway: Insights from a multiproxy approach

et al. 2016

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High‐latitude cold‐water coral (CWC) reefs are particularly susceptible due to enhanced CO2 uptake in these regions. Using precisely dated (U/Th) CWCs (Lophelia pertusa) retrieved during research cruise POS 391 (Lopphavet 70.6°N, Oslofjord 59°N) we applied boron isotopes (δ11B), Ba/Ca, Li/Mg, and U/Ca ratios to reconstruct the environmental boundary conditions of CWC reef growth. The sedimentary record from these CWC reefs reveals a lack of corals between ~6.4 and 4.8 ka. The question remains if this phenomenon is related to changes in the carbonate system or other causes. The initial postglacial setting had elevated Ba/Ca ratios, indicative of meltwater fluxes showing a decreasing trend toward cessation at 6.4 ka with an oscillation pattern similar to continental glacier fluctuations. Downcore U/Ca ratios reveal an increasing trend, which is outside the range of modern U/Ca variability in L. pertusa, suggesting changes of seawater pH near 6.4 ka. The reconstructed bottom water temperature at Lopphavet reveals a striking similarity to Barent sea surface and subsea surface temperature records. We infer that meltwater pulses weakened the North Atlantic Current system, resulting in southward advances of cold and CO2‐rich Arctic waters. A corresponding shift in the δ11B record from ~25.0‰ to ~27.0‰ probably implies enhanced pH up‐regulation of the CWCs due to the higher pCO2 concentrations of ambient seawater, which hastened mid‐Holocene CWC reef decline on the Norwegian margin.

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Growth history of a cold-water coral covered carbonate mound — Galway Mound, Porcupine Seabight, NE-Atlantic

Cited by 74 publications

References 48 publications

The Holocene occurrence of cold water corals in the NE Atlantic: Implications for coral carbonate mound evolution

The Holocene occurrence of cold water corals in the NE Atlantic: Implications for coral carbonate mound evolution

Paleoseawater density reconstruction and its implication for cold‐water coral carbonate mounds in the northeast Atlantic through time

Environmental constraints on Holocene cold‐water coral reef growth off Norway: Insights from a multiproxy approach

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