Timing and thermal influence of late orogenic extension in the lower crust: a UPb geochronological study from the southwest Grenville orogen, Canada
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U/Pb ages from relict eclogite bodies include a single determination of 1121 ± 10/12 Ma, six determinations of 1101-1069 Ma (all ± 4 Ma or less), and two less precise determinations of 1063 +48/-35 and 1048 ± 30 Ma.
“Estimated ages include a single determination of 1121 -+ 10 12 Ma, six determinations of 1101-1069 Ma (all ± 4 Ma or less), and two less precise determinations of 1063 -+ 48 35 and 1048 ± 30 Ma (see Fig. 2).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ketchum and Krogh 1998
In the vicinity of cross-section A, regional-scale ductile extensional flow along subhorizontal fabrics in the southern Parautochthonous belt at c. 1020 Ma and in the Adirondacks at c. 1060-1030 Ma indicates the presence of abnormally hot crust in these areas, and may imply bulk crustal thinning.
“In the vicinity of cross-section A, regional-scale ductile extensional flow along subhorizontal fabrics in the southern Parautochthonous belt at c45 1020 Ma (Culshaw et al. 1994; Ketchum et al. 1998) and in the Adirondacks at c45 1060-1030 Ma (McLelland et al. 1996) indicates the presence of abnormally hot crust in these areas, and may imply bulk crustal thinning.”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ketchum et al. 1998
Time of normal displacement on the Shawanaga shear zone in cross-section A has been dated at c. 1020 Ma.
“Time of normal displacement has been dated at c45 1020 Ma on Shawanaga shear zone in cross-section A (Culshaw et al. 1997; Ketchum et al. 1998)”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ketchum et al. 1998
Extensional displacement on the Shawanaga shear zone in the western Grenville Province occurred at c. 1020 Ma (latest Ottawan).
“As noted, Ketchum et al. (1998) have dated extensional displacement on Shawanaga shear zone in the western Grenville Province at c45 1020 Ma (i.e., latest Ottawan).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ketchum et al. (1998)
The Paleoproterozoic lower crust underlying the southern Parautochthonous belt in the western Grenville Province was unusually ductile during the Ottawa orogeny, leading to widespread distributed flow in gneissic rocks during both compressional and extensional tectonism.
“In addition, the Paleoproterozoic lower crust underlying the southern Parautochthonous belt in the western Grenville Province was unusually ductile during the Ottawa orogeny, leading to widespread distributed flow in gneissic rocks during both compressional and extensional tectonism (Fig. 12C; Culshaw et al. 1994, 1997; Ketchum et al. 1998).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ketchum et al. 1998
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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
Self-citation
- Authors
- Ketchum, J. W. F., Heaman, L. M., Krogh, T. E., Culshaw, N. G., & Jamieson, R. A.
- Affiliations
- Dalhousie University (CA)
- Royal Ontario Museum (CA)
- Corresponding author
- Ketchum, J.W.F.
- Venue
- Precambrian Research
- Publisher
- Elsevier BV
- Published
- 1998-05
- Volume
- 89
- Issue
- 1-2
- Pages
- 25-45
- ISSN
- 0301-9268 (ISSN-L)
- OpenAlex
- W2080674984
- Cited by
- 66
- References
- 0
- Citations by year
- 2026: 1 · 2024: 4 · 2023: 1 · 2020: 1 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 5 · 2015: 5 · 2013: 1 · 2012: 3
- FWCI
- 4.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Precambrian Research (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Geochemistry and Geochronology of Asian Mineral Deposits
- Keywords
- late-orogenic extension, Central Gneiss Belt, Grenville orogen, titanite geochronology, zircon U-Pb geochronology, inherited zircon
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