BIODEEP WP 2 Chemical and physical analyses of DHAB´s.

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Presentation transcript:

BIODEEP WP 2 Chemical and physical analyses of DHAB´s. A. watercolumn/brine analyses (UU) B. susp.mat. major/minor elements; C,N (UU) key trace elements (Pb,Co,Zn,Cu,Cd) (UP) C. sed.traps major/minor elements; C,N (UU) microfossils / biogenic components (UM) radiotracers (210Pb, 230Th) (SOC) D. sediments (major/minor elements; C,N) (SOC/UU) key trace elements (Pb,Co,Cu,Zn,Cd) (UP) E. pore water extraction/analysis (UU)

Suspended matter Samples were obtained from Urania basin in Oct. 2003 Filters have been thoroughly washed with demineralised water

Sediment traps Bannock 01/02 Urania 99/00 3500 ST3 2500 ST2 1500 ST1 Depth (m) 3500 ST4 2800 ST3 1500 ST2 460 ST1 Depth (m)

Sediment traps New traps analysed: Bannock 01/02 Urania 99/00 3500 ST3 2500 ST2 1500 ST1 Depth (m) 3500 ST4 2800 ST3 1500 ST2 460 ST1 Depth (m) New traps analysed: Bannock 02/03 ST3 (2500 m) and ST4 (3500 m) Urania 02/03 ST2 (2500 m) and ST3 (3500 m)

Methodology: Total destruction of samples for ICP-OES and ICP-MS analysis Subsampling during total destruction for Si analysis with photospectrometer C-total, C-organic and N contents with CNS- analyser

Total mass flux Sept.-May

Total mass flux Sept.-May

Average S concentrations for Aug Average S concentrations for Aug. 1999 - May 2000 (UB) and May 2001 – May 2002 (BB) S conc.

Average S concentrations for Aug Average S concentrations for Aug. 1999 - May 2000 (UB) and May 2001 – May 2002 (BB) S conc. S conc.

Average S flux for Aug. 1999 - May 2000 (UB) and May 2001 – May 2002 (BB)

Average CaCO3 concentrations and fluxes for summer 2002 - summer 2003 CaCO3 flux

Average N and C org fluxes for summer 2002 - summer 2003 N flux C org flux

Average Fe flux for summer 2002 - summer 2003

Radiotracers (SOC)

Chemical characterization of sediments Sediment composition Accumulation rates

Elemental composition (SOC) Sediments Elemental composition (SOC)

Sediments

Sediments

Sediments

Sediments

Sediments Core Water depth Accumulation rate Pb-210 excess inventory m g.cm-2.y-1 d.p.m. cm-2 Bannock 3476 0.0063 141 BD41BC5 3520 0.0066 14 MT6 Discovery 3533 0.0052 22 BD19MC4 BD26BC3 Urania 3475 0.024 23 BD07BC2 3455 ? >100 BD21MC3

Future Perspectives Suspended matter (esp. at interfaces) Gas content of brines (pressure sampling!) Sediment traps Sediment work (Discovery basin)