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Chronology for climate change: Developing age models for the biogeochemical ocean flux study cores

Manighetti, B; McCave, IN; Maslin, M; Shackleton, NJ; (1995) Chronology for climate change: Developing age models for the biogeochemical ocean flux study cores. Paleoceanography , 10 (3) 513 - 525. 10.1029/94PA03062. Green open access

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Abstract

We construct age models for a suite of cores from the northeast Atlantic Ocean by means of accelerator mass spectrometer dating of a key core, BOFS 5K, and correlation with the rest of the suite. The effects of bioturbation and foraminiferal species abundance gradients upon the age record are modeled using a simple equation. The degree of bioturbation is estimated by comparing modeled profiles with dispersal of the Vedde Ash layer in core 5K, and we find a mixing depth of roughly 8 cm for sand-sized material. Using this value, we estimate that age offsets between unbioturbated sediment and some foraminifera species after mixing may be up to 2500 years, with lesser effect on fine carbonate (<10 mu m) ages. The bioturbation model illustrates problems associated with the dating of ''instantaneous'' events such as ash layers and the ''Heinrich'' peaks of ice-rafted detritus. Correlations between core 5K and the other cores from the BOFS suite are made on the basis of similarities in the downcore profiles of oxygen and carbon isotopes, magnetic susceptibility, water and carbonate content, and via marker horizons in X radiographs and ash beds.

Type: Article
Title: Chronology for climate change: Developing age models for the biogeochemical ocean flux study cores
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/94PA03062
Publisher version: http://dx.doi.org/10.1029/94PA03062
Language: English
Additional information: Copyright 1995 by the American Geophysical Union
Keywords: North-Atlantic Ocean, C-14 ages, Sediments, Sea, Size, Pb-210, Tests, Ice
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/101337
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