Age of the Sudbury diabase dykes and their metamorphism in the Grenville Province, Ontario
Abstract
Diabase dykes of the Sudbury swarm in the Southern Province have baddeleyite U-Pb ages of 1235 +7/-3 Ma. Deformed metadiabase dykes in the adjacent Grenville Province, formerly correlated on the basis of chemistry, have the same age, and in addition contain metamorphic zircon formed at ~1000Ma, derived from igneous baddeleyite. This late Grenvillian age of metamorphism is corroborated by whole rock-garnet Sm-Nd ages. Sudbury metadiabase cuts earlier fabrics in metasedimentary gneiss in the Grenville Province, associated with metamorphism at ~1445 Ma. The Sudbury dykes are interpreted to have intruded across a structural and metamorphic front established at this time during a quiescent period preceding Grenvillian orogeny.
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The northwestern part of the Parautochthonous belt, known as the Grenville Front tectonic zone (GFTZ), is characterized by front-parallel structures with dip-parallel lineations.
“The northwestern part of the belt, known as the Grenville Front tectonic zone (GFTZ), is characterized by front-parallel structures with dip-parallel lineations, and the various domains and terranes of the Parautochthonous belt are linked lithologically to the foreland and each other by the presence of deformed mafic dykes belonging to, or having chemical affinities with, the c45 1235 Ma Sudbury”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Dudás et al. 1994
The various domains and terranes of the Parautochthonous belt are linked lithologically to the foreland and each other by the presence of deformed mafic dykes belonging to, or having chemical affinities with, the c45 1235 Ma Sudbury swarm.
“The northwestern part of the belt, known as the Grenville Front tectonic zone (GFTZ), is characterized by front-parallel structures with dip-parallel lineations, and the various domains and terranes of the Parautochthonous belt are linked lithologically to the foreland and each other by the presence of deformed mafic dykes belonging to, or having chemical affinities with, the c45 1235 Ma Sudbury”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Dudás et al. 1994
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The High Pressure belt in the Grenville Province: architecture, timing, and exhumation
Rivers, T., Ketchum, J., Indares, A., & Hynes, A. (2002) · Canadian Journal of Earth Sciences · doi:10.1139/e02-025 · Cited by 124 · see citing works
Buchan, K. L. (2013) · Precambrian Research · doi:10.1016/j.precamres.2013.09.018 · Cited by 66 · see citing works
- Authors
- Dudàs, F. O., Davidson, A., & Bethune, K. M.
- Affiliations
- Natural Resources Canada (CA)
- Published
- 1994
- OpenAlex
- W2911008816
- Cited by
- 48
- References
- 0
- Citations by year
- 2024: 1 · 2022: 3 · 2021: 5 · 2019: 2 · 2017: 1 · 2016: 1 · 2013: 2 · 2012: 4
- Type
- report
- Language
- en
- Open access
- closed
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Keywords
- Grenville Province, metamorphic zircon, metadiabase, Grenville orogeny, dyke intrusion, Precambrian metamorphism, Southern Province
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