Cariaco Basin, water column
Caribbean Sea, Venezuelan shelf, Venezuela
Other media
- Type
- Other medium
Anoxic, sulphidic basin below a chemocline at about 160 m, better connected to the open ocean than the Black Sea. Above the chemocline, ε205Tl from -5.9 to -5.2, close to the open ocean (-6.0), and Tl about 12 pg/g; below the chemocline, Tl drops (7.1 pg/g at 255 m, 1.4 pg/g at 400 m), taken up by pyrite forming in the water column; too little Tl for isotope analysis. Surface sediments record basin seawater (authigenic mean -5.4) (Owens et al., 2017). Coordinates from Table 4.
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −5.4 ± 0.3 ε | 1 | seawater at 35 m Single analysis; ± 0.3 ε (2 SD, SAFe D1 reproducibility); 12.1 pg/g Tl; above the chemocline. | Owens et al. (2017), Thallium-isotopic compositions of euxinic sediments as a proxy for g… | |
| −5.9 ± 0.3 ε | 1 | seawater at 100 m Single analysis; ± 0.3 ε (2 SD, SAFe D1 reproducibility); 12.1 pg/g Tl; above the chemocline. | Owens et al. (2017), Thallium-isotopic compositions of euxinic sediments as a proxy for g… | |
| −5.2 ± 0.4 ε | 2 | seawater at 150 m Published mean of 2 analyses; ± 0.4 ε (2 SD, n = 2); 12.3 pg/g Tl; above the chemocline. | Owens et al. (2017), Thallium-isotopic compositions of euxinic sediments as a proxy for g… |
Deposits of the same type
- Hydrogenetic Fe-Mn deposit (crust), North Atlantic (ArcI TR079, D-14)
- Subtropical North Atlantic, station GPrI 20 (31.67° N 64.17° W)
- Sargasso Sea, BATS station
- Hydrothermal manganese deposit, Galapagos Ridge (Pleiades II, D5-1A)
- Deep-water diagenetic Fe-Mn deposit (nodule), Northwest Atlantic (USGS, Nod-A-1), USGS reference material
- Hydrogenetic Fe-Mn deposit (crust), North Atlantic (BM1963.897)
- TAG active mound hydrothermal fluids (Mid-Atlantic Ridge)
- Hydrogenetic Fe-Mn deposit (crust), North Atlantic (Alv 539, 2-1A)
Cite this page
IsoFind Atlas (2026). Cariaco Basin, water column, isotope signatures. https://www.isofind.tech/isotopes/en/sites/bassin-de-cariaco-colonne-d-eau/ (accessed 2026-10-16).
@misc{isofind2026cariacobasinwatercolumnisotop,
title = {Cariaco Basin, water column, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/bassin-de-cariaco-colonne-d-eau/},
note = {Accessed 2026-10-16}
}Updated : 2026-10-16