The Moira Mounds, small cold-water coral banks in the Porcupine Seabight, NE Atlantic: Part A—an early stage growth phase for future coral carbonate mounds?

Wheeler, A.J.; Kozachenko, M.; Henry, L.-A.; Foubert, A.; de Haas, H.; Huvenne, V.A.I. ORCID: https://orcid.org/0000-0001-7135-6360; Masson, D.G.; Olu, K.. 2011 The Moira Mounds, small cold-water coral banks in the Porcupine Seabight, NE Atlantic: Part A—an early stage growth phase for future coral carbonate mounds? Marine Geology, 282 (1-2). 53-64. https://doi.org/10.1016/j.margeo.2010.08.006

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Abstract/Summary

This paper presents a comprehensive overview of the Moira Mounds in the Porcupine Seabight, combining a review of currently published material with new data and interpretations. The Moira Mounds are circular to ovoid-shaped individual or clustered coral banks (referred to as “scleractinian spaced cluster macroreefs”) located in the Belgica (carbonate) mound province, Porcupine Seabight, west of Ireland. They are up to 10 m high and 20 to 35 m in diameter. For the first time, a map showing the complete extent and location of the Moira Mounds is published, revealing 256 examples grouped into four areas mainly between 800 and 1100 m water depth. ROV groundtruthing revealed the importance of bedload sand transport in Moira Mound formation and development processes through sediment entrapment by coral frameworks (Lophelia pertusa and Madrepora oculata). New estimated growth rates for the Moira Mounds are comparable to those measured for much larger Irish coral carbonate mounds but an order of magnitude lower than rates from comparably sized reefs offshore Norway. As well as the framework corals, 26 macrobenthic invertebrate species were identified from a single box core that were similar to those communities found in adjacent off-mound habitats. It is proposed that the Moira Mounds are an example of the early stage growth phase of nearby giant coral carbonate mounds and represent a westward extension of the zone of active cold-water coral mound growth and therefore a deepening of the zone of cold-water coral growth over recent climate cycles.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.margeo.2010.08.006
ISSN:	00253227
Additional Keywords:	cold-water coral; coral carbonate mound; benthic processes; biogeological processes; marine geology; NE Atlantic
Date made live:	15 Apr 2011 12:38 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/281863

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.margeo.2010.08.006

ISSN:

00253227

Additional Keywords:

cold-water coral; coral carbonate mound; benthic processes; biogeological processes; marine geology; NE Atlantic

Date made live:

15 Apr 2011 12:38 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/281863