Clayton, Robin E; Nederbragt, Alexandra J; Malinovsky, Dmitry; Andersson, Per S; Thurow, Juergen W (2006): (Table T2) Stable iron isotope ratios and amount of iron extracted by different methods from ODP Site 207-1260 sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.776004, Supplement to: Clayton, RE et al. (2007): Data report: iron isotope geochemistry of mid-Cretaceous organic-rich sediments at Demerara Rise (ODP Leg 207). In: Mosher, DC; Erbacher, J; Malone, MJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 207, 1-14, https://doi.org/10.2973/odp.proc.sr.207.109.2007
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Abstract:
Fe isotope measurements are presented for 10 samples from the Cenomanian-Turonian black shale unit in Hole 1260B at Demerara Rise. The samples bracket the latest Cenomanian ocean anoxic event and were selected to ascertain whether Fe isotopes can be used to gain a better understanding of oceanic redox conditions during the mid-Cretaceous. Three extraction procedures were used to provide Fe extracts that represent the Fe oxide (average FeCBD = 0.07 wt%, N = 8), Fe oxide-sulfide-carbonate (average FeAR = 0.34 wt%, N = 10), and total Fe fractions (average FeHF = 0.81 wt%, N = 10). Fe isotope measurements were conducted on all FeAR extracts as a priority as these were considered to best reflect changes in the redox environment. d56Fe values range between 0.02 per mil ± 0.09 per mil and -0.77 per mil ± 0.05 per mil and appear to correlate negatively with the C/N ratio and oxygen index of total organic carbon. Isotopic measurements of two Fe oxide (FeCBD) extracts show a much heavier isotopic composition (d56Fe = 0.74 per mil ± 0.08 per mil and 0.63 per mil ± 0.04 per mil), which suggests isotopic partitioning between different mineral components in the sediment.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 9.265667 * Longitude: -54.544033
Date/Time Start: 2003-02-07T00:00:00 * Date/Time End: 2003-02-12T00:00:00
Minimum DEPTH, sediment/rock: 407.75 m * Maximum DEPTH, sediment/rock: 455.87 m
Event(s):
207-1260 * Latitude: 9.265667 * Longitude: -54.544033 * Date/Time Start: 2003-02-07T00:00:00 * Date/Time End: 2003-02-12T00:00:00 * Elevation: -2548.8 m * Penetration: 1000.9 m * Recovery: 718.1 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 100 cores; 862.2 m cored; 138.7 m drilled; 83.3 % recovery
Comment:
Sediment depth is given in mcd. Note: the amount of sample digested with Na citrate-Na bicarbonate-dithionite method is negligible.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Clayton, Robin E | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Iron | Fe | % | Clayton, Robin E | Na citrate-Na bicarbonate-dithionite extraction; # = anomalously high values due to contaminated resin | |
| 4 | δ56Fe | δ56Fe | ‰ | Clayton, Robin E | MC-ICP-MS Thermo-Finnigan Neptune | Na citrate-Na bicarbonate-dithionite extraction |
| 5 | δ56Fe, standard deviation | δ56Fe std dev | ± | Clayton, Robin E | 2 sigma; Na citrate-Na bicarbonate-dithionite extraction | |
| 6 | Iron | Fe | % | Clayton, Robin E | aqua regia extraction | |
| 7 | Percentage | Perc | % | Clayton, Robin E | Weighted | amount of sample digested with aqua regia |
| 8 | δ56Fe | δ56Fe | ‰ | Clayton, Robin E | MC-ICP-MS Thermo-Finnigan Neptune | aqua regia extraction |
| 9 | δ56Fe, standard deviation | δ56Fe std dev | ± | Clayton, Robin E | 2 sigma | |
| 10 | Iron | Fe | % | Clayton, Robin E | HNO3-hydrofluoric acid extraction | |
| 11 | Percentage | Perc | % | Clayton, Robin E | Weighted | amount of sample digested with HNO3-hydrofluoric acid |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
84 data points
Data
| 1 Sample label (DSDP/ODP/IODP sample designation) | 2 Depth sed [m] | 3 Fe [%] (Na citrate-Na bicarbonate-dit...) | 4 δ56Fe [‰] (Na citrate-Na bicarbonate-dit...) | 5 δ56Fe std dev [±] (2 sigma; Na citrate-Na bicarb...) | 6 Fe [%] (aqua regia extraction) | 7 Perc [%] (amount of sample digested wit...) | 8 δ56Fe [‰] (aqua regia extraction, MC-ICP...) | 9 δ56Fe std dev [±] (2 sigma) | 10 Fe [%] (HNO3-hydrofluoric acid extrac...) | 11 Perc [%] (amount of sample digested wit...) |
|---|---|---|---|---|---|---|---|---|---|---|
| 207-1260A-44R-1,93-94 | 407.75 | 0.05 | 0.30 | 29 | -0.18 | 0.10 | 0.69 | 73 | ||
| 207-1260A-44R-4,32.5-33.5 | 410.95 | 0.09 | 0.24 | 46 | -0.20 | 0.14 | 0.56 | 78 | ||
| 207-1260A-45R-3,27-28 | 414.59 | 0.02 | 0.31 | 21 | -0.21 | 0.01 | 0.97 | 80 | ||
| 207-1260A-46R-2,31-32 | 418.93 | 0.01 | 0.74 | 0.08 | 0.48 | 9 | 0.02 | 0.09 | 1.31 | 87 |
| 207-1260A-46R-5,53-54 | 423.24 | 0.01 | 0.63 | 0.04 | 0.43 | 23 | -0.47 | 0.06 | 0.10 | 86 |
| 207-1260B-35R-6,21-22 | 427.50 | 0.16 | 0.33 | 40 | -0.14 | 0.18 | 0.78 | 83 | ||
| 207-1260A-47R-3,33-34 | 430.82 | #0.72 | 0.21 | 31 | -0.29 | 0.05 | 0.84 | 84 | ||
| 207-1260A-47R-6,50-51 | 435.42 | 0.14 | 0.41 | 33 | -0.01 | 0.11 | 1.17 | 82 | ||
| 207-1260B-37R-6,62-63 | 445.04 | #0.61 | 0.34 | 39 | -0.43 | 0.11 | 1.16 | 79 | ||
| 207-1260B-38R-6,34-35 | 455.87 | 0.08 | 0.37 | 44 | -0.77 | 0.05 | 0.79 | 85 |