Cuyuna Range (Minnesota)
Minnesota, Cuyuna Range, United States
Banded iron formationsFe (Mn)
- Type
- Iron formation
Fe (Mn) deposit of Early Proterozoic age in a dominantly clastic metasedimentary terrane, metamorphosed to greenschist facies. Palmer and Slack (1989, Table 1): tourmaline at -5.17 ‰. Tourmalines of this kind of terrane range from -15.37 to -2.19 ‰ in the article; according to the authors, the boron source (continental crust, entrained seawater, evaporites) matters more than the formation temperature.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −5.17 ‰ | 1 | tourmaline of the massive sulfide or associated tourmalinite Single analysis (CUY-526). Uncertainties: CUY-526 -5.17 ± 0.34 ‰. | Palmer & Slack (1989), Boron isotopic composition of tourmaline from massive sulfide depo… |
Deposits of the same type
- Carajás Brazil
- Isua (BIF) Greenland
- Gongchangling China
- Cauê Formation (Quadrilátero Ferrífero) Brazil
- Iron Quadrangle, high-grade hematite ores (western region) Brazil
- Iron Quadrangle, high-grade hematite ores (eastern region) Brazil
- Qidashan China
- Marjajärvi (Marjarova) Sweden
Cite this page
IsoFind Atlas (2026). Cuyuna Range (Minnesota), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/chaine-de-cuyuna-minnesota/ (accessed 2026-10-19).
@misc{isofind2026cuyunarangeminnesotaisotopesi,
title = {Cuyuna Range (Minnesota), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/chaine-de-cuyuna-minnesota/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19