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

Content Provider	Springer Nature Link
Author	Haas, Henk Mienis, Furu Frank, rbert Richter, Thomas O. Steinacher, Reinhold Stigter, Henko Land, Cees Weering, Tjeerd C. E.
Copyright Year	2008
Abstract	Cold-water coral mounds on both margins of the Rockall Trough (NE Atlantic Ocean) have a strongly different 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 baffling of biogenic carbonate debris and siliciclastic particles by the coral framework covering the mounds. This is confirmed by 210Pb 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 firmgrounds 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.
Starting Page	1
Ending Page	26
Page Count	26
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	55
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-09-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cold-water coral mounds Cold-water corals NE Atlantic Ocean Rockall Trough Margin Model Ecology Paleontology Geochemistry Biogeosciences Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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