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Geology, Mineralization, and Emplacement of the Foy Offset Dike, Sudbury Impact Structure
Abstract
The Foy offset dike is the longest of the known radial dikes associated with the 1.85 Ga Sudbury Igneous Complex. The Foy dike extends for at least 30 km from the complex into the North Range Archean and Proterozoic footwall rocks of the Sudbury impact structure. The dike ranges in width from 400 m, where it connects to the Sudbury Igneous Complex, to 50 m at its most distal known exposure. We divide the dike into a proximal segment and a distal segment, based on where it intersects the concentric Hess offset dike. Three main dike lithologies are distinguished, all referred to as varieties of quartz diorite. Inclusion-rich pyroxene-quartz diorite occurs in the embayment, adjacent to the base of the main mass of the Sudbury Igneous Complex. This constitutes the sublayer. Northward, the sublayer gives way to amphibole-biotite inclusion-bearing quartz diorite and amphibole-biotite inclusion-poor quartz diorite. The dike is mineralized and deposits in the proximal segment have been mined. Mineralization is associated with the inclusion-rich dike phase. At the Nickel offset mine the dike contains inclusion- bearing massive Ni-Cu sulfides that also host platinum-group minerals. The orebodies occurred as strike-parallel sheets within the central parts of the dike in association with inclusion-bearing quartz diorite. The geochemistry of the dike lithologies indicates that both the inclusion-poor and inclusion-bearing quartz diorite varieties are close in composition to the postulated…
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In the North Range, the annular trough coincides with downfaulted Huronian outliers and Archean greenstones, and with a change in strike and vertical offset in the Foy dyke.
“In the North Range, this trough coincides with downfaulted Huronian outliers and Archean greenstones, and a change in strike and vertical offset in the Foy dyke (Tuchscherer and Spray 2002).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Tuchscherer and Spray 2002
Downfaulting beyond Ring 1 is indicated by a marked shift in trend, grain size, and chemistry of the Foy offset dyke.
“Downfaulting beyond Ring 1 is also indicated by a marked shift in trend, grain size, and chemistry of the Foy offset dyke (Tuchscherer and Spray 2002).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Tuchscherer and Spray 2002
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GRIEVE, R. A. F., REIMOLD, W. U., MORGAN, J., RILLER, U., & PILKINGTON, M. (2008) · Meteoritics & Planetary Science · doi:10.1111/j.1945-5100.2008.tb01086.x · Cited by 90
Spray, J. G., Butler, H. R., & Thompson, L. M. (2004) · Meteoritics & Planetary Science · doi:10.1111/j.1945-5100.2004.tb00341.x · Cited by 75
Self-citation
Metadata
- Authors
- Tuchscherer, M. G., & Spray, J. G.
- Venue
- Economic Geology
- Publisher
- Society of Economic Geologists, Inc.
- Published
- 2002-11
- Volume
- 97
- Issue
- 7
- Pages
- 1377-1397
- ISSN
- 1554-0774
- 0361-0128
- Cited by
- 11
- References
- 0
- Language
- en
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