Hydrodynamics and cold-water coral facies distribution related to recent sedimentary processes at Galway Mound west of Ireland

Dorschel, Boris; Hebbeln, Dierk; Foubert, Anneleen; White, Martin; Wheeler, A.

doi:10.1016/j.margeo.2007.06.010

Cited by 129 publications

(121 citation statements)

References 35 publications

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“…Following upon the Younger Dryas cold reversal at about 11 ka corals re-appear on mounds of Porcupine Seabight and on mounds of SW Rockall Bank and likely also further to the North synchronous to environmental changes recorded in sediments. Over the course of the Holocene, productivity is then unlikely to change in a dramatic way, and millennium scale oceanographic changes (Bond et al, 2001) are unlikely to alter dramatically the local hydrodynamic regime near mounds driven by strong bottom water currents and tidal waves (White et al, 2005;Dorschel et al, 2007;Mienis et al, 2007). Moreover, deep-water corals develop today over a large range of environmental conditions from the Mediterranean Sea to the northern margin of the Norwegian shelf.…”

Section: Discussionmentioning

confidence: 99%

“…Since about a decade these deep-water coral reefs are subject to extensive European research efforts to better constrain ecosystem functioning and coral reef development (Henriet et al, 1998;Hovland et al, 1998;de Mol et al, 2002;Dorschel et al, 2005;Freiwald and Roberts, 2005;White et al, 2005;Roberts et al, 2006;van Rooij et al, 2006;Dorschel et al, 2007;Mienis et al, 2007;Wheeler et al, 2007). These mounds can achieve a height of several hundred meters and measure several square kilometres at the base (Hovland et al, 1994;de Mol et al, 2002;Huvenne et al, 2003;Kenyon et al, 2003;van Weering et al, 2003).…”

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: Introductionmentioning

confidence: 99%

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

et al. 2009

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“…The authors propose a model in which the migration of hydrocarbons into the water column locally "fertilizes" the ambient seawater with organic and inorganic compounds fueling thriving microbial and coral communities. In an alternative hypothesis, several others suggest that external current-and density-controlled mechanisms govern coral reef distribution and growth (Dorschel et al, 2007;De Mol et al, 2002;Frederiksen et al, 1992;Mienis et al, 2007;Mortensen et al, 2001;White et al, 2005White et al, , 2007bWhite, 2007a). This external reef development theory is further supported by the recent study of Dullo et al (2008), which showed a preferential coral settlement, including Røst Reef and Traenadjupet Reef, in water masses of a density of 27.5±0.15 kg/m 3 .…”

Section: Introductionmentioning

confidence: 90%

Carbon mineralization and carbonate preservation in modern cold-water coral reef sediments on the Norwegian shelf

et al. 2009

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Abstract. Cold-water coral ecosystems are considered hotspots of biodiversity and biomass production and may be a regionally important contributor to carbonate production. The impact of these ecosystems on biogeochemical processes and carbonate preservation in associated sediments were studied at Røst Reef and Traenadjupet Reef, two modern (post-glacial) cold-water coral reefs on the MidNorwegian shelf. Sulfate and iron reduction as well as carbonate dissolution and precipitation were investigated by combining pore-water geochemical profiles, steady state modeling, as well as solid phase analyses and sulfate reduction rate measurements on gravity cores of up to 3.25 m length. Low extents of sulfate depletion and dissolved inorganic carbon (DIC) production, combined with sulfate reduction rates not exceeding 3 nmol S cm −3 d −1 , suggested that overall anaerobic carbon mineralization in the sediments was low. These data showed that the coral fragment-bearing siliciclastic sediments were effectively decoupled from the productive pelagic ecosystem by the complex reef surface framework. Organic matter being mineralized by sulfate reduction was calculated to consist of 57% carbon bound in CH 2 O groups and 43% carbon in -CH 2 -groups. Methane concentrations were below 1 µM, and failed to support the hypothesis of a linkage between the distribution of coldwater coral reefs and the presence of hydrocarbon seepage. Reductive iron oxide dissolution linked to microbial sulfate reduction buffered the pore-water carbonate system and inhibited acid-driven coral skeleton dissolution. A large pool of reactive iron was available leading to the formation of iron

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“…Cold-water coral reefs are self-sustained and spatially well defined coral framework sediment systems measuring from tens of metres to several kilometres in lateral extension and up to 40 m in thickness, thus influencing local current regimes (Dorschel et al, 2007). Most cold-water coral reefs occur in deep waters, between 200 and 1500 m, where light is reduced or absent (Freiwald, 2011 (Cairns, 2007).…”

Section: Cold-water Coral Reefsmentioning

confidence: 99%

Management Strategies to Limit the Impact of Bottom Trawling on VMEs in the High Seas of the SW Atlantic

Portela¹,

Acosta²,

Cristobo³

et al. 2012

Marine Ecosystems

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Hydrodynamics and cold-water coral facies distribution related to recent sedimentary processes at Galway Mound west of Ireland

Cited by 129 publications

References 35 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

Carbon mineralization and carbonate preservation in modern cold-water coral reef sediments on the Norwegian shelf

Management Strategies to Limit the Impact of Bottom Trawling on VMEs in the High Seas of the SW Atlantic

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