Oxide-rich ultramafic intrusions of the Duluth Complex (including Titac)
Minnesota, Duluth Complex, United States
Magmatic (Ni-Cu-PGE, carbonatites)Ti-Fe (V)
- Type
- Oxide-rich ultramafic intrusions (OUI)
Layered mafic intrusion (LMI) magnetite analysed by Emproto et al. (2026). Small Fe-Ti oxide-bearing ultramafic bodies within the troctolites of the complex (Kleinsasser et al., 2024); three Titac magnetites from +0.7 to +3.4 ‰, seven from the other intrusions from -2.4 to -0.7 ‰.
δ49Ti in ‰ (per mil) Values of the same system
Standard : OL-Ti
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 2.1 ± 1.4 ‰ | 0.7 / 3.4 ‰ | 3 | magnetite from the Titac intrusion Mean and standard deviation recalculated from 3 analyses, +0.7 to +3.4 (3838 +2.2; 3856 +3.4; 3789-191 +0.7). | Emproto et al. (2026), Extensive titanium isotope fractionation in magmatic and hydrother… |
| −1.2 ± 0.6 ‰ | −2.4 / −0.7 ‰ | 7 | magnetite from the other oxide-rich ultramafic intrusions Mean and standard deviation recalculated from 7 analyses, -2.4 to -0.7 (2 -1.4; 4 -0.7; 6 -1.0; 8 -0.7; 10 -2.4; 12 -1.2; 14 -1.2). Samples numbered 2 to 14 in Table 1. | Emproto et al. (2026), Extensive titanium isotope fractionation in magmatic and hydrother… |
Deposits of the same type
- Bayan Obo China
- Norilsk-Talnakh Russia
- Bushveld, Merensky Reef South Africa
- Bushveld, UG2 chromitite South Africa
- Bushveld, Platreef South Africa
- Sudbury Canada
- Voisey's Bay Canada
- Rössing Namibia
Cite this page
IsoFind Atlas (2026). Oxide-rich ultramafic intrusions of the Duluth Complex (including Titac), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/intrusions-ultramafiques-riches-en-oxydes-du-complexe-de-duluth-dont-titac/ (accessed 2026-10-20).
@misc{isofind2026oxiderichultramaficintrusions,
title = {Oxide-rich ultramafic intrusions of the Duluth Complex (including Titac), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/intrusions-ultramafiques-riches-en-oxydes-du-complexe-de-duluth-dont-titac/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20