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Characterisation of differential mixing of foraminifera and bulk carbonate in NE Atlantic sediments.

Characterisation of differential mixing of foraminifera and bulk carbonate in NE Atlantic sediments.
Characterisation of differential mixing of foraminifera and bulk carbonate in NE Atlantic sediments.
Radiocarbon age offsets between foraminifera and bulk carbonate samples were investigated in a sediment core from the western Rockall Plateau in the North East Atlantic. Within the surface mixed layer (SML), foraminifera (forams) ages were significantly younger than those of the bulk sediment at corresponding depths. Below the SML, no significant offset was observed between the two, which is in contrast to previous studies. The absence of an offset below the SML may be the result of advective biological mixing dominating over diffusive mixing in the SML, or the foram size fraction being below the threshold at which size selective mixing becomes active. Within the SML, the sampling strategy may bias the collection of forams towards the youngest specimens at each depth.
Radiocarbon, Foraminifera, AMS, Marine sediment
0168-583X
490-494
Brown, L.
71ebbeab-98c3-45f3-b3f2-200387870709
Cook, G.T.
80bc1c4f-6b8a-4786-9758-8e6393cc2470
Mackenzie, A.B.
7df1a0df-988d-401b-aef1-c29557eebd75
Naysmith, P.
07980607-31a6-4356-ad11-4f0c16e404ba
Anderson, R.
394fb68e-1194-4609-80aa-f6141ced089a
Thomson, J.
3395054f-e507-4841-9758-a06ed37f7d6b
Nixon, S.
4f986947-9e12-4f2b-bc11-1d35b125d860
Brown, L.
71ebbeab-98c3-45f3-b3f2-200387870709
Cook, G.T.
80bc1c4f-6b8a-4786-9758-8e6393cc2470
Mackenzie, A.B.
7df1a0df-988d-401b-aef1-c29557eebd75
Naysmith, P.
07980607-31a6-4356-ad11-4f0c16e404ba
Anderson, R.
394fb68e-1194-4609-80aa-f6141ced089a
Thomson, J.
3395054f-e507-4841-9758-a06ed37f7d6b
Nixon, S.
4f986947-9e12-4f2b-bc11-1d35b125d860

Brown, L., Cook, G.T., Mackenzie, A.B., Naysmith, P., Anderson, R., Thomson, J. and Nixon, S. (2000) Characterisation of differential mixing of foraminifera and bulk carbonate in NE Atlantic sediments. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 172 (1-4), 490-494. (doi:10.1016/S0168-583X(00)00389-X).

Record type: Article

Abstract

Radiocarbon age offsets between foraminifera and bulk carbonate samples were investigated in a sediment core from the western Rockall Plateau in the North East Atlantic. Within the surface mixed layer (SML), foraminifera (forams) ages were significantly younger than those of the bulk sediment at corresponding depths. Below the SML, no significant offset was observed between the two, which is in contrast to previous studies. The absence of an offset below the SML may be the result of advective biological mixing dominating over diffusive mixing in the SML, or the foram size fraction being below the threshold at which size selective mixing becomes active. Within the SML, the sampling strategy may bias the collection of forams towards the youngest specimens at each depth.

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More information

Published date: October 2000
Keywords: Radiocarbon, Foraminifera, AMS, Marine sediment

Identifiers

Local EPrints ID: 58257
URI: https://eprints.soton.ac.uk/id/eprint/58257
ISSN: 0168-583X
PURE UUID: 11c356ed-2415-4f54-a56e-32dac6cbd214

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Date deposited: 12 Aug 2008
Last modified: 13 Mar 2019 20:32

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Contributors

Author: L. Brown
Author: G.T. Cook
Author: A.B. Mackenzie
Author: P. Naysmith
Author: R. Anderson
Author: J. Thomson
Author: S. Nixon

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