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Metallogenesis of an early Proterozoic foreland sequence, eastern Hudson Bay, Canada
Abstract
On the E side of Hudson Bay, the NW margin of the Archaean Superior Structural Province is overlain by an unmetamorphosed, little deformed, Early Proterozoic supracrustal sequence. The sequence is divisible into three parts, possible tectosomes, each characterized by a distinct style of mineralization. The arkosic, alluvial Richmond Gulf Group was shed eastward from a thermal uplift and has been preserved only in a later aulacogen, the Richmond Gulf Graben. It contains an apatite-cemented redbed. Secondly, a widespread post-aulacogen, carbonate-rich, W-facing miogeocline blanketed the region. A pyritic zone developed at its basal contact is particularly thick and hosts disseminated copper mineralization where formed on the arkose in the graben. A pyritic, brecciated, stromatolite-rich horizon within the carbonate contains galena and sphalerite. Thirdly, widespread iron formation and a local 60 cm thick manganese carbonate bed, overlying W-derived basalt flows, flysch and arkosic molasse, all of uncertain tectonic affinity, terminate the sequence.
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Tidal signatures observed in GIF and interbedded sedimentary rocks in Minnesota and the Hudson Bay region are consistent with at least periodically open-marine conditions, albeit very shallow, during IF deposition.
“although tidal signatures have been observed in GIF and interbedded sedimentary rocks in Minnesota and the Hudson Bay region (Ojakangas, 1983; Chandler, 1984), which is consistent with at least periodically open-marine conditions, albeit very shallow, during IF deposition.”
From Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history (2017) · cites this paper as Chandler, 1984
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References 61 · Cited by 24
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Metadata
- Authors
- Chandler, F. W.
- Corresponding author
- Chandler, F. W.
- Venue
- Journal of the Geological Society
- Publisher
- Geological Society of London
- Published
- 1984-03
- Volume
- 141
- Issue
- 2
- Pages
- 299-313
- ISSN
- 0016-7649 (ISSN-L)
- 2041-479X
- OpenAlex
- W2016728762
- Cited by
- 24
- References
- 61
- Citations by year
- 2024: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 1 · 2013: 1
- FWCI
- 1.22
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the Geological Society (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- ore genesis, Early Proterozoic, foreland basin, supracrustal sequences, aulacogen, pyrite, iron-formation, manganese carbonate, stromatolites, galena, sphalerite, basaltic lava flows, flysch, molasses
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