Characterisation of differential mixing of foraminifera and bulk carbonate in NE Atlantic sediments.
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 B, 172, (1-4), 490-494. (doi:10.1016/S0168-583X(00)00389-X).
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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.
|Keywords:||Radiocarbon; Foraminifera; AMS; Marine sediment|
|Subjects:||Q Science > QE Geology
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > National Oceanography Centre (NERC)
|Date Deposited:||12 Aug 2008|
|Last Modified:||25 Apr 2013 17:41|
|Contributors:||Brown, L. (Author)
Cook, G.T. (Author)
Mackenzie, A.B. (Author)
Naysmith, P. (Author)
Anderson, R. (Author)
Thomson, J. (Author)
Nixon, S. (Author)
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