Black Sea, southwestern shelf (stations 3 and 4)
Black Sea, shelf northwest of the Bosporus
Sediments
- Type
- Sediment
Sediments from the 1988 R/V Knorr cruise; depositional setting defined by iron speciation (Lyons and Severmann, 2006). Chen et al. (2022) find no Fe-Mn shuttle effect: authigenic ε205Tl does not vary with setting and stays close to Black Sea surface water (-2.2), authigenic δ51V is heavier under euxinic waters (-0.57 ‰) than under oxic or suboxic waters (-1.06 and -1.04 ‰). The top 4 cm were deposited under oxic waters, deeper levels under suboxic waters, during a past shoaling of the chemocline (Lyons et al., 1993).
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.6 ± 0.41 ε | −3.06 / −2.28 ε | 3 | shelf sediment, 0 to 4 cm, deposited under oxic water, authigenic fraction (Tl) Mean and standard deviation recalculated from 3 analyses, -3.06 to -2.28 (3 2-4 -2.45; 4 0-2 -2.28; 4 2-4 -3.06). Published means for all oxic sediments: ε205Tl -2.7 ± 0.3 (1 SD, N = 10), δ51V -1.06 ± 0.33 ‰ (N = 9). | Chen et al. (2022), Iron and manganese shuttle has no effect on sedimentary thallium and … |
| −2.3 ± 0.42 ε | −2.78 / −1.83 ε | 6 | shelf sediment, 4 to 14 cm, deposited under suboxic water, authigenic fraction (Tl) Mean and standard deviation recalculated from 6 analyses, -2.78 to -1.83 (3 4-6 -1.86; 3 10-12 -2.71; 3 12-14 -2.11; 4 4-6 -2.78; 4 6-8 -1.83; 4 8-10 -2.50). Station 3, 4-6 cm: heaviest ε205Tl of the data set (-1.86). Station 4, 6-8 cm: δ51V at -0.44 ‰, outside the range of the other suboxic sediments. Published means for all suboxic sediments: ε205Tl -2.4 ± 0.5 (N = 10, while the table gives only 9 values, mean -2.47), δ51V -1.04 ± 0.30 ‰. | Chen et al. (2022), Iron and manganese shuttle has no effect on sedimentary thallium and … |
δ51V in ‰ (per mil) Values of the same system
Standard : AA (Alfa Aesar)
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −1.23 ± 0.35 ‰ | −1.56 / −0.86 ‰ | 3 | shelf sediment, 0 to 4 cm, deposited under oxic water, authigenic fraction (V) Mean and standard deviation recalculated from 3 analyses, -1.56 to -0.86 (3 2-4 -0.86; 4 0-2 -1.56; 4 2-4 -1.27). Published means for all oxic sediments: ε205Tl -2.7 ± 0.3 (1 SD, N = 10), δ51V -1.06 ± 0.33 ‰ (N = 9). | Chen et al. (2022), Iron and manganese shuttle has no effect on sedimentary thallium and … |
| −0.95 ± 0.3 ‰ | −1.15 / −0.44 ‰ | 5 | shelf sediment, 4 to 14 cm, deposited under suboxic water, authigenic fraction (V) Mean and standard deviation recalculated from 5 analyses, -1.15 to -0.44 (3 4-6 -0.94; 3 6-8 -1.12; 3 10-12 -1.15; 3 12-14 -1.11; 4 6-8 -0.44). Station 3, 4-6 cm: heaviest ε205Tl of the data set (-1.86). Station 4, 6-8 cm: δ51V at -0.44 ‰, outside the range of the other suboxic sediments. Published means for all suboxic sediments: ε205Tl -2.4 ± 0.5 (N = 10, while the table gives only 9 values, mean -2.47), δ51V -1.04 ± 0.30 ‰. | Chen et al. (2022), Iron and manganese shuttle has no effect on sedimentary thallium and … |
Deposits of the same type
- Pebble iron oxide precipitates United States
- Laohugou No. 12 Glacier cryoconite China
- Yuzhufeng Glacier cryoconite China
- Bayi Glacier cryoconite China
- Qiyi Glacier cryoconite China
- Yulong Snow Mountains glacier cryoconite China
- Hailuogou Glacier (Mount Gongga) cryoconite China
- Dangxiong Glacier cryoconite China
Cite this page
IsoFind Atlas (2026). Black Sea, southwestern shelf (stations 3 and 4), isotope signatures. https://www.isofind.tech/isotopes/en/sites/mer-noire-plateau-sud-ouest-stations-3-et-4/ (accessed 2026-10-20).
@misc{isofind2026blackseasouthwesternshelfstat,
title = {Black Sea, southwestern shelf (stations 3 and 4), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/mer-noire-plateau-sud-ouest-stations-3-et-4/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20