Carbonate mound development in contrasting settings on the Irish margin

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doi: 10.1016/j.dsr2.2013.10.004
Author(s): van der Land, Cees; Eisele, Markus; Mienis, Furu; de Haas, Henk; Hebbeln, Dierk; Reijmer, John J. G.; van Weering, Tjeerd C. E.
Author Affiliation(s): Primary:
Royal Netherlands Institute for Sea Research, Department of Marine Geology, Den Burg, Netherlands
Other:
University of Bremen, Germany
VU University of Amsterdam, Netherlands
Volume Title: Biology and geology of deep-sea coral ecosystems; proceedings of the Fifth international symposium on Deep-sea corals
Volume Author(s): Mienis, Furu, editor; Duineveld, Gerard; Lavaleye, Marc; van Weering, Tjeerd
Source: Deep-Sea Research. Part II: Topical Studies in Oceanography, Vol.99, p.297-306; Fifth international symposium on Deep-sea corals, Amsterdam, Netherlands, April 1-6, 2012, edited by Furu Mienis, Gerard Duineveld, Marc Lavaleye and Tjeerd van Weering. Publisher: Elsevier, Oxford, International. ISSN: 0967-0645
Note: In English. 68 refs.; illus., incl. 2 tables, sketch map
Summary: Cold-water coral carbonate mounds, formed by framework building cold-water corals, are found in several mound provinces on the Irish margin. Differences in cold-water coral mound development rates and sediment composition between mounds at the southwest Rockall Trough margin and the Galway Mound in the Porcupine Seabight are investigated. Variations in sediment composition in the two mound provinces are related to the local environmental conditions and sediment sources. Mound accumulation rates are possibly higher at the Galway Mound probably due to a higher influx of hemipelagic fine grained non-carbonate sediments. In both cold-water coral mound areas, mound growth has been continuous for the last ca 11,000 years, before this period several hiatuses and unconformities exist in the mound record. The most recent unconformity can be correlated across multiple mounds and mound provinces at the Irish margin on the basis of apparent age. On the southwest Rockall Trough margin these hiatuses/unconformities are associated with post-depositional aragonite dissolution in, and lithification of, certain intervals, while at Galway Mound no lithification occurs. This study revealed that the influx and types of material transported to cold-water coral mounds may have a direct impact on the carbonate mound accumulation rate and on post-depositional processes. Significantly, the Logachev Mounds on the SW Rockall Trough margin accumulate slower but, because they contain lithified layers, are less susceptible to erosion. This net effect may account for their larger size compared to the Belgica Mounds. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Aragonite; Atlantic Ocean; C-14; Calcite; Calcium carbonate; Carbon; Carbonate rocks; Carbonates; Cenozoic; Chronostratigraphy; Cold-water environment; Continental margin; Cores; Dates; Deep-sea environment; Europe; Expedition 307; Holocene; Integrated Ocean Drilling Program; Ireland; Isotopes; Lithostratigraphy; Marine environment; Marine sediments; Mineral composition; Mounds; North Atlantic; Northeast Atlantic; Organic carbon; Porcupine Seabight; Quaternary; Radioactive isotopes; Reefs; Rockall Trough; Sedimentary rocks; Sediments; Upper Quaternary; Western Europe
Coordinates: N512200 N512700 W0113300 W0114400
Record ID: 2014093855
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands