Cajarc reservoir on the Lot
Riou Mort basin and Lot valley, Aveyron and Lot, France
Sediments
- Type
- Sediment
The Viviez zinc ore processing plant (Vieille Montagne then Umicore) refined up to 100,000 t of zinc per year (1985) by electrolysis and thermal processing; its tailings, very heavy in zinc, polluted the Riou Mort and then the Lot until extraction stopped in 1987. First large reservoir, about 40 km downstream of the confluence; anthropogenic zinc 81 to 98 %. Indicative coordinates.
δ66Zn in ‰ (per mil) Values of the same system
Standard : JMC 3-0749L
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.97 ± 0.05 ‰ | 0.89 / 1.03 ‰ | 5 | Mean and standard deviation recalculated from 5 levels, Table 2. Sediments deposited from 1952 to 1972, combined electrolysis and thermal processing. | Sivry et al. (2008), Zn isotopes as tracers of anthropogenic pollution from Zn-ore smelte… |
| 1.25 ± 0.11 ‰ | 1.03 / 1.36 ‰ | 7 | Mean and standard deviation recalculated from 7 levels, Table 2. Sediments from 1978 to 1995: heavier after the switch to electrolysis only in 1976-1977. | Sivry et al. (2008), Zn isotopes as tracers of anthropogenic pollution from Zn-ore smelte… |
| 0.78 ± 0.05 ‰ | 0.75 / 0.82 ‰ | 2 | Mean and standard deviation recalculated from 2 levels, Table 2. Sediments of 2000 and 2001, after remediation. | Sivry et al. (2008), Zn isotopes as tracers of anthropogenic pollution from Zn-ore smelte… |
Deposits of the same type
- Riou Mort downstream of the Viviez plant France
- Riou Mort and Riou Viou upstream of the Viviez plant France
- Marcenac reservoir on the Lot (reference) France
- Digonnière peatland (Dig1Ter core) France
- Scheldt estuary Netherlands
- Natural Qaamarujuk fjord sediments (pre-mining) Greenland
- Keqikaer Glacier cryoconite China
- Paraíba do Sul and Guandu rivers Brazil
Cite this page
IsoFind Atlas (2026). Cajarc reservoir on the Lot, isotope signatures. https://www.isofind.tech/isotopes/en/sites/retenue-de-cajarc-sur-le-lot/ (accessed 2026-10-13).
@misc{isofind2026cajarcreservoironthelotisotop,
title = {Cajarc reservoir on the Lot, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/sites/retenue-de-cajarc-sur-le-lot/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13