U-Pb zircon and Re-Os isotope geochronology of mineralized ultramafic intrusions and associated nickel ores from the Thompson nickel belt, Manitoba, Canada
Abstract
A U-Pb zircon age (1880 ± 5 Ma) has been obtained from a mineralized ultramafic body in the Setting Lake area of the Thompson nickel belt. This crucial new age for ultramafic magmatism in the Thompson belt, in conjunction with the precise age determinations established for the Molson dike swarm (Cross Lake dike, 1883.7+1.7 –1.5 +Ma; Cuthbert Lake dike, 1883 ± 2 Ma) and the Fox River sill (1882.9+1.5 –1.4 +Ma) by Heaman et al. (1986) provides the first direct evidence for the contemporaneous nature of mafic-ultramafic magmatism along the northwest margin of the Superior craton. This magmatic event also appears to be synchronous with mafic magmatism in other parts of the Circum-Superior belt and the Trans-Hudson orogen. Re-Os isotope systematics of mineralized samples from seven deposits that span the length of the belt produce an age similar to the U-Pb zircon age but with a much larger error (1885 ± 49 Ma with an initial γ Os of 4.6). The Os isotope data demonstrate that the source of the Thompson belt ores, including those orebodies hosted in ultramafic rocks and those hosted in pelitic rocks, was dominantly mantle derived. Establishing that Thompson belt magmatism is synchronous with the Molson dike swarm and the extensive Fox River sill has important new exploration implications and requires modification of existing concepts which have presumed that Thompson belt magmatism is significantly older than these other intrusive suites. Also, it would appear that other important Ni and Ni-Cu deposits elsewhere in the Circum-Superior belt and in the Trans-Hudson orogen formed at or near 1.88 Ga, and thus this age could be considered an important and widespread nickel mineralizing metallogenic interval during the Early Proterozoic.
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The ca. 1.88 Ga GIFs are coeval with emplacement of a ca. 1.88 Ga ultramafic to mafic large igneous province (LIP).
“These GIFs are coeval with emplacement of a ca. 1.88 Ga ultramafic to mafic LIP”
From Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history (2017) · cites this paper as Hulbert et al., 2005
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Volcanism takes a back seat driving global iron deposition after the Great Oxidation EventPreprint
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- Authors
- Hulbert, L. J., Hamilton, M. A., Horan, M. F., & Scoates, R. F. J.
- Affiliations
- Geological Survey of Canada (CA)
- Carnegie Institution for Science (US)
- Venue
- Economic Geology
- Publisher
- Society of Economic Geologists, Inc.
- Published
- 2005-01-01
- Volume
- 100
- Issue
- 1
- Pages
- 29-41
- ISSN
- 0361-0128 (ISSN-L)
- OpenAlex
- W2047881069
- Cited by
- 46
- References
- 51
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 2 · 2017: 5 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 3
- FWCI
- 1.90
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Economic Geology (publishedVersion)
- Funders
- U.S. Geological Survey
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Geochemistry and Geochronology of Asian Mineral Deposits
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Keywords
- ultramafic intrusions, nickel ore, zircon U-Pb geochronology, Re-Os isotopes, Superior Province, Trans-Hudson Orogen, nickel-copper deposits
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