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

2. 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

4. UraniaBasin Bannock Basin Mass fluxes 500 1500 water depth 2500 3500

5. Elemental fluxes in anoxic traps
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

6. 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

7. 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

8. 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?

9. 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?

10. 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?

11. 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)

12. 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?

13. 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?

14. 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?

15. 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?

16. 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?

17. 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

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

19. sediment trap efficiency:
estimated from natural radionuclide 230Th

20. 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