Guern Halfaya (Oum Edeboua mine)
Northern Tunisia, Domes zone, Tunisie
Mississippi Valley TypePb-Zn (Ba, Sr)
- Type
- Pb-Zn (Fe-Ba-Sr) at the contact of a Triassic evaporite diapir and Cretaceous limestones
Stockwork and veins in limestones at the Triassic-Upper Cretaceous contact and in Cenomanian to Turonian limestones (Bahloul Formation), near the Guern Halfaya diapir; galena, sphalerite, framboidal pyrite, chalcopyrite, grey copper and arsenopyrite, with barite, celestite, gypsum and nacrite; fluid inclusions at 95 to 130 °C and 10 to 25 wt% NaCl eq. (Kassaa, 1998). Triassic sulphates (+12.7 to +15.0 ‰) from the evaporites, sulphides (+3.3 to +9.5 ‰) from their bacterial reduction; homogeneous crustal lead and Upper Cretaceous model age (Jemmali et al., 2013). Coordinates not given.
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 13.33 ± 0.61 ‰ | 12.8 / 14 ‰ | 3 | Triassic gypsum Mean and standard deviation recalculated from 3 analyses, GH 2, GH 12 and GH 16. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… |
| 15 ‰ | 1 | Triassic celestite Single analysis; MGH VI. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… | |
| 12.7 ‰ | 1 | Triassic barite Single analysis; MGH VIII. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… | |
| 5.2 ± 2.91 ‰ | 3.3 / 9.5 ‰ | 4 | galena (Triassic-Upper Cretaceous contact and Upper Cretaceous) Mean and standard deviation recalculated from 4 analyses, MGH II-1, III-1, IV and VII-1; offset from the Triassic sulphates consistent with bacterial reduction at about 95 to 130 °C. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… |
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 18.72667 ± 0.00351 | 18.723 / 18.73 | 3 | galena Mean and standard deviation recalculated from 3 analyses, MGH I-2, III-1 and VII-1; published model ages (Stacey and Kramers) of 80 to 90 Ma. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.677 ± 0.00361 | 15.673 / 15.68 | 3 | galena Mean and standard deviation recalculated from 3 analyses, MGH I-2, III-1 and VII-1; published model ages (Stacey and Kramers) of 80 to 90 Ma. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 38.822 ± 0.01473 | 38.806 / 38.835 | 3 | galena Mean and standard deviation recalculated from 3 analyses, MGH I-2, III-1 and VII-1; published model ages (Stacey and Kramers) of 80 to 90 Ma. | Jemmali et al. (2013), Sulfur and lead isotopes of Guern Halfaya and Bou Grine deposits (… |
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Cite this page
IsoFind Atlas (2026). Guern Halfaya (Oum Edeboua mine), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/guern-halfaya-mine-d-oum-edeboua/ (accessed 2026-10-15).
@misc{isofind2026guernhalfayaoumedebouamineiso,
title = {Guern Halfaya (Oum Edeboua mine), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/guern-halfaya-mine-d-oum-edeboua/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15