Giant Carbonate Mounds and Current-Swept Seafloors on the Slopes of the Southern Rockall Trough

Akhmetzhanov, A.; Kenyon, Neil H.; Ivanov, M.K.; Wheeler, A.; Shashkin, Pavel; Weering, Tj.C.E. van

doi:10.1007/978-3-642-55846-7_33

Cited by 13 publications

(13 citation statements)

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“…Kenyon et al 1998;Freiwald et al 1999Freiwald et al , 2002aOlu-Le Roy et al 2002;Akhmetzhanov et al 2003;Kenyon et al 2003;Fosså et al 2005;Foubert et al 2005;Wheeler et al 2005a, b, c;De Mol et al 2006;Lindberg et al 2006). These images reveal that gross mound morphology is strongly influenced by the dominant current directions but may also be inherited from the morphology of features that provide the initial hard substrate facilitating settlement and early colonisation.…”

Section: Introductionmentioning

confidence: 85%

“…Numerous steep-sided, giant cold-water coral carbonate mounds have been identified on the northwest Porcupine Bank (Kenyon et al 1998Akhmetzhanov et al 2003;van Weering et al 2003;Wheeler et al 2005a) and are collectively known as the Pelagia mounds (Fig. 2).…”

Section: Pelagia Mounds Northwest Porcupine Bankmentioning

confidence: 97%

“…Wilson et al 1979b;Scoffin et al 1980;Masson et al 2003;Foubert et al 2005;Wheeler et al 2005b, c;Lindberg et al 2006;Wheeler et al 2006), to giant mounds hundreds of metres tall and a few kilometres across (e.g. Kenyon et al 1998;De Mol et al 2002;Huvenne et al 2002;Akhmetzhanov et al 2003;Beyer et al 2003;Huvenne et al 2003;Kenyon et al 2003, O'Reilly et al 2003van Weering et al 2003;O'Reilly and Readman 2004;De Mol et al 2005;Foubert et al 2005;Wheeler et al 2005c;Huvenne et al 2005;Beyer et al 2006;De Mol et al 2006;Huvenne et al 2006;Mienis et al 2006). The origin of these mounds has been related to hydrocarbon seepage Thomsen 1989, 1997;Hovland 1990Hovland , 1992Hovland et al 1994;Henriet et al 1998;Hovland et al 1998;Henriet et al 2001;Hovland and Risk 2003) or autogenic processes stimulated by high current speeds and food supply (Frederiksen et al 1992;Freiwald et al 1997;Mortensen et al 2001;De Mol et al 2002;Kenyon et al 2003;Duineveld et al 2004;Wh...…”

Section: Introductionmentioning

confidence: 96%

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Morphology and environment of cold-water coral carbonate mounds on the NW European margin

Wheeler

Beyer

Freiwald

et al. 2006

Int J Earth Sci (Geol Rundsch)

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Cold-water coral carbonate mounds, owing their presence mainly to the framework building coral Lophelia pertusa and the activity of associated organisms, are common along the European margin with their spatial distribution allowing them to be divided into a number of mound provinces. Variation in mound attributes are explored via a series of case studies on mound provinces that have been the most intensely investigated: Belgica, Hovland, Pelagia, Logachev and Norwegian Mounds. Morphological variation between mound provinces is discussed under the premise that mound morphology is an expression of the environmental conditions under which mounds are initiated and grow. Cold-water coral carbonate mounds can be divided into those exhibiting ''inherited'' morphologies (where mound morphology reflects the morphology of the colonised features) and ''developed'' morphology (where the mounds assume their own gross morphology mainly reflecting dominant hydrodynamic controls). Finer-scale, surface morphological features mainly reflecting biological growth forms are also discussed.

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Section: Introductionmentioning

confidence: 85%

Section: Pelagia Mounds Northwest Porcupine Bankmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 96%

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Morphology and environment of cold-water coral carbonate mounds on the NW European margin

Wheeler

Beyer

Freiwald

et al. 2006

Int J Earth Sci (Geol Rundsch)

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“…Within the last and a half decade a suite of articles on coldwater corals (mainly Lophelia pertusa and Madrepora oculata framebuilders) and coral-covered carbonate build-ups at the European and North American continental margin has been published (Hovland et al 1994;Freiwald et al 1997;Hovland and Thomsen 1997;Henriet et al 1998;de Mol et al 2002;Huvenne et al 2002;Riding 2002;Akhmethzanov et al 2003;Kenyon et al 2003;Pinheiro et al 2003;van Weering et al 2003a, b;Duineveld et al 2004;Dorschel et al 2005;Lindberg and Mienert 2005;Freiwald and Roberts 2005;Taviani et al 2005a, b;Bryan and Metaxas 2006;Mienis et al 2006;Roberts et al 2006;Mienis et al 2007;Wheeler et al 2007). In these publications coral biology, mound morphology, the possible role of hydrocarbon leakage in mound formation and oceanographic forcing conditions are discussed.…”

Section: Introductionmentioning

confidence: 98%

Morphology and sedimentology of (clustered) cold-water coral mounds at the south Rockall Trough margins, NE Atlantic Ocean

Haas

Mienis

Frank

et al. 2008

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Cold-water coral mounds on both margins of the Rockall Trough (NE Atlantic Ocean) have a strongly diVerent morphology. Single, isolated mounds occur on the SE margin and are mainly found on the upper slope between 900 and 650 m water depth, while large mound clusters are found on the SW margin in water depths between 600 and 1,000 m, in a narrow zone almost parallel to the slope. Sedimentation rates on the mounds are higher than on the surrounding seabed as a result of baZing of biogenic carbonate debris and siliciclastic particles by the coral framework covering the mounds. This is conWrmed by 210 Pb measurements. The individual coral growth rate can be three times higher then the vertical growth rate of the coral cover ( §10 mm year ¡1 ) which in turn is more than an order of magnitude higher then the present-day overall mound growth rate ( §0.25 mm year ¡1 ). The presence of extensive hardgrounds and Wrmgrounds and the three-dimensional coral framework are considered to be responsible for the stability of the relatively steep slopes of the mounds. High current velocities in the intramound areas result in local non-sedimentation and erosion, as is shown by the presence of IRD (ice-rafted debris) lag deposits on the seabed and moats around some of the mounds. The morphology and sedimentology of cold-water coral-covered (mainly Lophelia pertusa and Madrepora oculata) mounds on the southern Rockall Trough margins (NE Atlantic Ocean) is discussed and a model describing the development of these mounds is presented.

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“…These are now known to be coral carbonate mounds. They form clusters, or 'provinces', with notable examples in the north east Atlantic from the Porcupine Seabight (De Mol et al 2002;Huvenne et al 2005;Wheeler et al 2005), southern Rockall Trough (Akhmetzhanov et al 2003;Kenyon et al 2003) and west Africa (Colman et al 2005). Large deep-water coral accumulations and 'lithoherms' have also been reported in the western Atlantic along the Florida-Hatteras Slope (Stetson 1962;Neumann 1977), and are now the subject of increased research activity (Reed and Ross 2005;Reed et al 2006;Ross and Quattrini 2007).…”

Section: Introductionmentioning

confidence: 99%

Cold-water coral reef frameworks, megafaunal communities and evidence for coral carbonate mounds on the Hatton Bank, north east Atlantic

Roberts

Henry

Long

et al. 2008

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Offshore banks and seamounts sustain diverse megafaunal communities including framework reefs formed by cold-water corals. Few studies have quantified environmental effects on the alpha or beta diversity of these communities. We adopted an interdisciplinary approach that used historical geophysical data to identify topographic highs on Hatton Bank, which were surveyed visually. The resulting photographic data were used to examine relationships between megafaunal communities and macrohabitat, the latter defined into six categories (mud, sand, cobbles, coral rubble, coral framework, rock). The survey stations revealed considerable small-scale variability in macrohabitat from exposed Late Palaeocene lava flows to quiescent muddy habitats and coral-built carbonate mounds. The first reported evidence for coral carbonate mound development in UK waters is presented, which was most pronounced near present day or former sites of topographic change suggesting that local current acceleration favoured coral framework growth and mound initiation.Alpha diversity varied significantly across macrohabitats, but not between rock and coral rubble, or between smaller-grain sized categories of cobbles, sand and mud. Community composition differed between most macrohabitats, and variation in beta diversity across Hatton Bank was largely explained by fine-scale substratum. Certain megafauna were clearly associated with particular macrohabitats, with stylasterid corals notably associated with cobble and rock habitats and coral habitats characterised by a diverse community of suspension-feeders. The visual surveys also produced novel images of deep-water megafauna including a new photographic record of the gorgonian coral Paragorgia arborea, a species not previously reported from Rockall Plateau.Further interdisciplinary studies are needed to interpret beta diversity across these and other environmental gradients on Hatton Bank. It is clear that efforts are also needed to improve our understanding of the genetic connectivity and biogeography of vulnerable deep-water ecosystems and to develop predictive models of their occurrence that can help inform future conservation measures.

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Giant Carbonate Mounds and Current-Swept Seafloors on the Slopes of the Southern Rockall Trough

Cited by 13 publications

References 5 publications

Morphology and environment of cold-water coral carbonate mounds on the NW European margin

Morphology and environment of cold-water coral carbonate mounds on the NW European margin

Morphology and sedimentology of (clustered) cold-water coral mounds at the south Rockall Trough margins, NE Atlantic Ocean

Cold-water coral reef frameworks, megafaunal communities and evidence for coral carbonate mounds on the Hatton Bank, north east Atlantic

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