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Lea, David W (1989): Ba/Ca ratios in benthic foraminifera from recent core tops. PANGAEA,, Supplement to: Lea, David W; Boyle, Edward A (1989): Barium content of benthic foraminifera controlled by bottom-water composition. Nature, 338, 751-753,

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The carbon isotope ratio (delta13C) and cadmium content (Cd/Ca) of benthic foraminifera shells have been used to reconstruct deep-water circulation patterns of the glacial oceans. These tracers co-vary with phosphorus in the modern ocean because they are nearly quantitatively regenerated from sinking biological debris in the upper water column. Hence they can be used to reconstruct the distribution of labile nutrients in glacial water masses. Independent constraints on glacial deep-ocean circulation patterns could be provided by a tracer of the distribution of silica and alkalinity, the deeply regenerated constituents of planktonic hard parts. Barium shares key aspects of its behaviour with these refractory nutrients because it is removed from solution in surface waters and incorporated into sinking particles which slowly dissolve deep in the water column and in the sediments. The fractionation of Ba between deep-water masses of the major ocean basins is largely controlled by thermohaline circulation patterns, so Ba conforms to different boundary conditions from Cd and 13C. As Ba substitutes into trigonal carbonates, it is a potential palaeoceano-graphic tracer if the Ba content of foraminifera shells reflects ambient dissolved Ba concentrations. Here we present data from Recent core-top benthic foraminifera which indicate that the Ba content of some recent calcitic benthic foraminifera does co-vary with bottom-water Ba.
Median Latitude: 12.677898 * Median Longitude: -21.743405 * South-bound Latitude: -54.550000 * West-bound Longitude: -106.183300 * North-bound Latitude: 78.000000 * East-bound Longitude: 158.800000
Minimum DEPTH, sediment/rock: 0.010 m * Maximum DEPTH, sediment/rock: 0.160 m
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
3Sample code/labelSample labelLea, David W* denotes cores with > 15 cm Holocene sediment
4DEPTH, sediment/rockDepth sedmGeocode
5Depth, top/minDepth topmLea, David W
6Depth, bottom/maxDepth botmLea, David W
7Depth, bathymetricBathy depthmLea, David W
8BariumBaµmol/lLea, David W
9Barium/Calcium ratioBa/Caµmol/molLea, David WCibicidoides wuellerstorfi
10Standard deviationStd dev±Lea, David WCibicidoides wuellerstorfi
11Barium/Calcium ratioBa/Caµmol/molLea, David WCibicidoides kullenbergi
12Standard deviationStd dev±Lea, David WCibicidoides kullenbergi
13Barium/Calcium ratioBa/Caµmol/molLea, David WUvigerina spp.
14Standard deviationStd dev±Lea, David WUvigerina spp.
288 data points

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