Irish Midlands Zn-Pb prospects and basement veins
Irish Midlands (Kildare, Limerick, Offaly, Longford, Tipperary) and Tyrone, Irlande
Mississippi Valley TypeZn-Pb
- Type
- Carbonate-hosted Zn-Pb (Irish type), prospects and feeder veins
Group of subeconomic prospects (Harberton Bridge, Pallas Green, Kinnitty, Keel) and feeder veins in the lower Palaeozoic basement (Latteragh, Glenlark in Northern Ireland). Irish-type Zn-Pb deposits formed at about 350 to 340 Ma by replacement of Lower Carboniferous carbonates, through mixing of a deep metal-bearing fluid (170 to 240 °C) with a brine rich in bacterial sulfide. Sphalerite δ66Zn, unrelated to temperature, increases from feeder veins to late orebodies: kinetic fractionation during rapid precipitation, or mixing of two sources. Coordinates of the group centre. Indicative coordinates.
δ66Zn in ‰ (per mil) Values of the same system
Standard : JMC 3-0749L
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.25 ± 0.3 ‰ | 0 / 0.64 ‰ | 4 | prospect sphalerite Mean and standard deviation recalculated from 4 samples, Table 1. Harberton Bridge 0.03 ‰ (about 62 °C), Pallas Green 0.64 ‰ (153 °C), Kinnitty 0.34 ‰ (60 °C), Keel 0.00 ‰ (163 °C, feeder vein). | Wilkinson et al. (2005), Zinc isotope variation in hydrothermal systems: preliminary evid… |
| 0.12 ± 0.08 ‰ | 0.06 / 0.18 ‰ | 2 | sphalerite of basement feeder veins Mean and standard deviation recalculated from 2 samples, Table 1. Latteragh 0.18 ‰ (139 °C), Glenlark 0.06 ‰ (240 °C). | Wilkinson et al. (2005), Zinc isotope variation in hydrothermal systems: preliminary evid… |
Deposits of the same type
- Galmoy Irlande
- Lisheen Irlande
- Tynagh Irlande
- Silvermines Irlande
- Navan (Tara) Irlande
- Kilbricken Irlande
- Sheshodonnell Irlande
- Cloghatrida (Rathkeale) Irlande
Cite this page
IsoFind Atlas (2026). Irish Midlands Zn-Pb prospects and basement veins, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/indices-zn-pb-et-filons-du-socle-des-midlands-irlandais/ (accessed 2026-10-13).
@misc{isofind2026irishmidlandsznpbprospectsand,
title = {Irish Midlands Zn-Pb prospects and basement veins, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/indices-zn-pb-et-filons-du-socle-des-midlands-irlandais/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13