WP2 Sediment trap results

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WP2 Sediment trap results A. Hübner Utrecht University G.J. de Lange Utrecht University J. Thomson SOC, Southampton

Mass fluxes of anoxic and oxic traps and cores Elemental fluxes in anoxic basins Compositional changes in anoxic basins compared to anoxic cores, oxic traps and oxic cores Sediment trap efficiencies

UraniaBasin Bannock Basin Mass fluxes 500 1500 water depth 2500 3500

Elemental fluxes in anoxic traps 2002-2003 Mostly an order of magnitude more in UB than in BB, but different in S! and in Mg and Cr and Mn? Also C and N not really an order of magnitude: because the C and N conc are differetn in the basisns, with considerable higher values in BB than in UB

Elemental fluxes in anoxic traps 2002-2003 Elemental flux (Urania/Bannock) – Mass flux (Urania/Bannock) 339 Mostly an order of magnitude more in UB than in BB, but different in S! and in Mg and Cr and Mn? Also C and N not really an order of magnitude: because the C and N conc are differetn in the basisns, with considerable higher values in BB than in UB

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core BD03 ST3 BB anox.trap UN02 ST4 MT6 anox. core UN02 ST3 oxic trap SL 139 oxic core PS27 ST4 UB UN01 ST3 BD21MC2 UB-east BD07 UB-west UN01ST2 UM35

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Ba bio = Ba tot – (Al * (Ba/Al)det) Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline? Ba bio = Ba tot – (Al * (Ba/Al)det)

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline?

C/N Redfield composition: 6.2 Compositional changes in anoxic basins compared to anoxic cores, oxic traps and an oxic core Ba is difficult, why so high in BB? UB trap values not reliable Ti: low values in anox traps due to differetn, lateral inputs? Method ICP oes ms Mg: dolomite formation in UB already in the brine, in BB only in sediment Sr/Ca?? What significance, more Sr in different carbonates? Si/Al? What is the baseline? C/N Redfield composition: 6.2

Analysis of suspended matter Elemental analysis with ICP-MS C/N determination

sediment trap efficiency: estimated from natural radionuclide 230Th

trap year funnel (g) sum vials (g) funnel/vials measured/expected BB 1500 m 01-02 3,9 7,5 0,5 0,38 BB 2500 m 3,2 5,6 0,6 0,25 BB 500 m 02-03 2,2 4,9 1,7 1,5 1,2 2,3 4,7 UB 1500 m 2,5 0,9 0,13 UB 2500 m 3,8 3,5 1,1 0,12