Upper Mississippi Valley district
Iowa, Wisconsin, Illinois, United States
Mississippi Valley TypePb-Zn
- Type
- Mississippi Valley Type (MVT)
An extensive district whose wide isotopic range reflects fluids that can be traced beyond the limits of the main district.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 19.38 / 24.46 | galena | Lead isotopes from the Upper Mississippi Valley district: A regional perspective, USGS Bu… (1995) |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 15.73 / 16.24 | galena | Lead isotopes from the Upper Mississippi Valley district: A regional perspective, USGS Bu… (1995) |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 39.24 / 43.69 | galena | Lead isotopes from the Upper Mississippi Valley district: A regional perspective, USGS Bu… (1995) |
Deposits of the same type
- Northern Arkansas district United States
- Tri-State district United States
- Central and East Tennessee MVT United States
- Southern Appalachians MVT United States
- Cusses (Brusque) France
- Les Malines France
- Saint-Félix-de-Pallières France
- Durfort France
Cite this page
IsoFind Atlas (2026). Upper Mississippi Valley district, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-la-haute-vallee-du-mississippi/ (accessed 2026-10-06).
@misc{isofind2026uppermississippivalleydistric,
title = {Upper Mississippi Valley district, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-la-haute-vallee-du-mississippi/},
note = {Accessed 2026-10-06}
}Updated : 2026-10-06