Citation:

PA002i005p00531

Name: Comparison of glacial/interglacial carbonate concentrations in Atlantic sediments
Published: 1987
License: https://creativecommons.org/licenses/by/3.0/
Keywords: Barcelona Coast; Cork Harbour; Guadiana Estuary; Himmerfjarden; Limfjorden; Oder Estuary; Pertuis Charentais; Scheldt Delta Estuary; Taranto Mare Piccolo; Thau Lagoon

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Abstract:

To assess the regional effects of glaciation on sedimentation in the Atlantic Ocean we compare sediment types, distributions, and rates between Recent (core top) and last glacial maximum (LGM: ~18,000 years B.P.) stratigraphic levels. Based upon smear slides and carbonate analyses in 178 cores we find that glacial age carbonate content is generally lower than Recent. During both the Recent and LGM, carbonate content shows an east/west asymmetry with western basins exhibiting lower carbonate values. Input of ice-rafted detritus into the North Atlantic during LGM time interrupts this topographic control on carbonate distribution considerably farther south than at present; in the South Atlantic this effect is minor. Comparison of LGM and Recent sediment distributions indicates that the LGM seafloor was dominated by biogenic oozes, calcareous clays, and clays, while the Recent is dominated by biogenic oozes and marls. Coarse-grained detritus is much more prevalent in LGM sediments, derived not only from glacial input but also from fluvial and aeolian sources. Sedimentation rates, calculated from LGM to Recent sediment thickness in cores, are <4 cm/1000 yr for most of the ocean. Higher rates are typical of the continental margin off the Amazon River, the North American Basin, and a small region off west equatorial Africa.

Keyword(s):

Barcelona Coast; Cork Harbour; Guadiana Estuary; Himmerfjarden; Limfjorden; Oder Estuary; Pertuis Charentais; Scheldt Delta Estuary; Taranto Mare Piccolo; Thau Lagoon

Project(s):

Lamont-Doherty Earth Observatory, Columbia University (LDEO)

Quaternary Environment of the Eurasian North (QUEEN)

Funding:

Fourth Framework Programme (FP4), grant/award no. MAS3980185 : Quaternary Environment of the Eurasian North

Coverage:

Median Latitude: 6.327966 * Median Longitude: -28.582269 * South-bound Latitude: -55.150000 * West-bound Longitude: -76.466667 * North-bound Latitude: 72.183000 * East-bound Longitude: 18.450000

Date/Time Start: 1954-07-10T00:00:00 * Date/Time End: 1974-08-21T00:00:00

Event(s):

A152-118 * Latitude: 35.116700 * Longitude: -44.666700 * Elevation: -4334.0 m * Campaign:

A156-3 * Latitude: 31.000000 * Longitude: -76.000000 * Elevation: -3220.0 m * Campaign:

A156-4 * Latitude: 34.816667 * Longitude: -74.683333 * Elevation: -3100.0 m * Campaign: * Method/Device: Piston corer (PC)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)