Fault-associated seabed mounds (carbonate knolls?) off western Ireland and north-west Australia

Hovland, Martin; Croker, Peter F.; Martin, M.

doi:10.1016/0264-8172(94)90099-x

Cited by 185 publications

(142 citation statements)

References 14 publications

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“…16). We infer, from their topographic simiarity to carbonate knolls described by Hovland et al (1994) off Australia, that the mounds were formed from methane-derived authigeniuc carbonates. Similar features have been descibed from both active and passive margins and the geologic record (León et al, 2006;Magalhães et al, 2012).…”

Section: Continental Slopementioning

confidence: 64%

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Muñoz¹,

Acosta²,

Cristobo³

et al. 2013

Earth-Science Reviews

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Section: Continental Slopementioning

confidence: 64%

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Muñoz¹,

Acosta²,

Cristobo³

et al. 2013

Earth-Science Reviews

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“…2). They were also reported by Hovland et al (1994) who attributed them to bottom current erosion or to the escape of pore water or gases through the seafloor. De suggested they were caused by current scouring, and interpreted their elongation direction as the result of a northward-directed current.…”

Section: Tobi Sidescan Sonar Mosaicmentioning

confidence: 83%

“…1). The Hovland Mound province is located in the north, and was originally described by Hovland et al (1994). The mounds are conical to elongated, ridge-like structures, reaching up to 150 m above the seabed.…”

Section: Mounds and Coralsmentioning

confidence: 99%

The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

Huvenne¹,

Beyer

Haas

et al. 2005

Cold-Water Corals and Ecosystems

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Abstract. Carbonate mounds, identified as deep-water coral banks, have been reported recently from three provinces in the Porcupine Seabight, SW of Ireland. As yet, the mechanisms behind their formation and development are only partly understood. This contribution discusses their seabed appearance and present-day sedimentary environment, based on a large-scale TOB I sidescan sonar mapping carried out in 2002, and on detailed ROV video records from specific sites within the three mound provinces, collected in 2001. The study of the presentday characteristics and variability of these mounds can help to understand their development history in the past.The imagery clearly shows that the sedimentary environment in the Magellan and Hovland Mound provinces in the northern Porcupine Seabight is much quieter than in the current-swept Belgica Mound province on the eastern flank of the basin. In the latter area, for example, gravel lags and coarse sediments are found, together with patches of sorted sands, striations, barchan dunes and sediment waves. The difference in environment results in different mound appearances. The richest coral communities with the most abundant live coral occurrences are found in the Belgica province, while for example on the Magellan Mounds only a few live coral colonies are left. The present-day situation of the coral banks in the Porcupine Seabight thus illustrates the influence of the interplay between current and sediment dynamics on coral growth and mound development.

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“…Within Porcupine Seabight, along Porcupine Bank and on Rockall Bank, numerous carbonate mound provinces have been found at water depth between 400 m and 1100 m (Hovland et al, 1994;de Mol et al, 2002;Huvenne et al, 2003;Kenyon et al, 2003;van Weering et al, 2003;Wheeler et al, 2005;van Rooij et al, 2006;van Wheeler et al, 2007;Foubert et al, 2007;Huvenne et al, 2007).…”

Section: Environmental Settingmentioning

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). The sedimentary environment is complex due to strong directional bottom water currents (White et al, 2005;Mienis et al, 2007).…”

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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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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Fault-associated seabed mounds (carbonate knolls?) off western Ireland and north-west Australia

Cited by 185 publications

References 14 publications

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

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

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