Growth history of a cold-water coral covered carbonate mound; Galway Mound, Porcupine Seabight, NE-Atlantic

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doi: 10.1016/j.margeo.2008.05.006
Author(s): Eisele, Markus; Hebbeln, Dierk; Wienberg, Claudia
Author Affiliation(s): Primary:
University of Bremen, MARUM-Center for Marine Environmental Sciences, Bremen, Federal Republic of Germany
Volume Title: Marine Geology
Source: Marine Geology, 253(3-4), p.160-169. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 48 refs.; illus., incl. 3 tables, sketch map
Summary: During the past decade, knowledge about the ecology and the environment of giant carbonate mounds has been growing continuously. However, still little is known about their growth dynamics. Three gravity cores from Galway Mound, Belgica Mound Province in the Porcupine Seabight off Ireland, were investigated for their sedimentological, geophysical and geochemical properties to get insight into the long-term development of this cold-water coral covered carbonate mound. These data were supplemented by radiometric age determinations on planktonic foraminifera and coral skeletons. The records from three different settings on Galway Mound reveal a coherent growth history that in general is similar to what is known from other carbonate mounds at the Irish margin. However, whereas other cores are often disturbed by numerous and not correlateable hiatuses, Galway Mound, in contrast, appears to be characterised by only one major hiatus representing a time gap of ≈250 kyr. Several mechanisms are discussed in this study as possible causes for the observed stratigraphic record at Galway Mound. The most likely explanation is that the hiatus has its origin in a major mass wasting event on an unstable, possibly glacial, unit that could have acted as a slip plane. The overall Late Quaternary growth history of Galway Mound fits well into existing cyclical mound development models, pointing to Galway Mound being an "actively growing" mound ("coral bank stage") at present. Abstract Copyright (2008) Elsevier, B.V.
Year of Publication: 2008
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Anthozoa; Atlantic Ocean; Belgica Mound Province; C-14; Carbon; Cenozoic; Cnidaria; Coelenterata; Cold-water environment; Continental margin sedimentation; Cores; Correlation; Cycles; Dates; Ecology; Ecosystems; Europe; Expedition 307; Experimental studies; Foraminifera; Galway Mound; Geochemistry; Holocene; Integrated Ocean Drilling Program; Invertebrata; Ireland; Isotope ratios; Isotopes; Magnetic properties; Magnetic susceptibility; Marine environment; Marine sediments; Microfossils; Mounds; North Atlantic; O-18/O-16; Oxygen; Paleomagnetism; Planktonic taxa; Porcupine Basin; Protista; Quaternary; Radioactive isotopes; Reef builders; Sedimentation; Sedimentation rates; Sediments; Spectra; Stable isotopes; Upper Quaternary; Western Europe; X-ray fluorescence spectra
Coordinates: N512600 N512730 W0114500 W0114600
Record ID: 2008116750
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands