Site
|
Water
depth (m) |
R
|
Jd/(Jd + Jb)
|
SRR
(mmol/m2/yr) |
---|---|---|---|---|
Leg 201 |
||||
1225 | 3760 | 1.014 | 0.82 | ND |
1226 | 3297 | 1.040 | 0.46 | 14 |
1227 | 427 | 1.019 | 0.75 | 82 |
1228 | 252 | 1.023 | 0.67 | 573 |
1229 | 151 | 1.018 | 0.59 | 681 |
Leg 181 |
||||
1119 | 396 | 1.015 | 0.80 | ND |
1120 | 544 | 1.029 | 0.61 | ND |
1121 | 4490 | 1.009 | 0.88 | ND |
1122 | 4432 | 1.048 | 0.36 | ND |
1123 | 3290 | 1.045 | 0.40 | ND |
1124 | 3978 | 1.040 | 0.47 | ND |
1125 | 1350 | 1.014 | 0.81 | ND |
Notes: R = minimum isotope fractionation under apparent closed system, conditions calculated based on pore water sulfate profiles in the upper sulfate zone (see text). Estimated R values for the deep (brine influenced) sulfate zone were found to be 1.028 (Site 1228) and 1.022 (Site 1229). Openness of the sedimentary system toward dissolved sulfate (Jd/[Jd + Jb]) are calculated based on the relationship derived by Claypool (2004; see text). SRR = depth integrated sulfate reduction rates, measured with radiotracers in the whole sulfate zone (J. Kallmeyer and T.G. Ferdelman, pers. comm., 2004). Results are compared to sites from the southwest Pacific (ODP Leg 181; Böttcher et al., 2004b). ND = not determined.