Monazite U–Th–Pb geochronology of the Central Metasedimentary Belt Boundary Zone (CMBbz), Grenville Province, Ontario Canada
Open accessAbstract
The Central Metasedimentary Belt boundary zone (CMBbz) is a crustal-scale shear zone that juxtaposes the Central Gneiss Belt and the Central Metasedimentary Belt of the Grenville Province. Geochronological work on the timing of deformation and metamorphism in the CMBbz is ambiguous, and the questions that motivate our study are: how many episodes of shear zone activity did the CMBbz experience, and what is the tectonic significance of each episode? We present electron microprobe data from monazite (the U–Th–Pb chemical method) to directly date deformation and metamorphism recorded in five garnet–biotite gneiss samples collected from three localities of the CMBbz of Ontario (West Guilford, Fishtail Lake, and Killaloe). All three localities yield youngest monazite dates ca. 1045 Ma; most of the monazite domains that yield these dates are high-Y rims. In comparison with this common late Ottawan history, the earlier history of the three CMBbz localities is less clearly shared. The West Guilford samples have monazite grain cores that show older high-Y domains and younger low-Y domains; these cores yield a prograde early Ottawan (1100–1075 Ma) history. The Killaloe samples yield a well-defined prograde, pre- to early Shawinigan history (i.e., 1220–1160 Ma) in addition to some evidence for a second early Ottawan event. In other words, the answers to our research questions are: three events; a Shawinigan event possibly associated with crustal thickening, an Ottawan event possibly associated with another round of crustal thickening, and a late Ottawan event that resists simple interpretation in terms of metamorphic history but that coincides chronologically with crustal thinning at the base of an orogenic lid.
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Markley et al. (2018) data provided evidence for a well-defined prograde, pre-to late Shawinigan event (i.e., 1220-1160 Ma).
“Specifically their data provided evidence for: i) a well-defined prograde, pre-to late Shawinigan event (i.e., 1220-1160 Ma), ii ) a prograde early Ottawan event (1100-1075 Ma), and iii) a late Ottawan event at ca. 1045 Ma that they interpreted to be related to extensional tectonics.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. (2018)
In the Discussion (manuscript p. 19), Markley et al. interpret Killaloe monazite dates of 1220–1160 Ma and decreasing yttrium as recording prograde metamorphism associated with the Shawinigan event. The interpretation is qualified elsewhere (manuscript p. 17) as tentative, and the older Shawinigan record is reported for the Killaloe samples rather than throughout the CMBbz. Calling the prograde event “well-defined” overstates that certainty. (LLM, conf=0.83)
Experimental — accuracy not yet measuredFor the Bancroft terrane, the T max stage is represented by the early Ottawan phase before 1.08 Ga, supported by monazite ages of Markley et al. (2018) who observed prograde metamorphism from 1.095 to 1.08 Ga in the West Guilford area.
“For the Bancroft terrane this T max stage is represented by the early Ottawan phase before 1.08 Ga, which is supported by the monazite ages of Markley et al. (2018) who observed prograde metamorphism from 1.095 to 1.08 Ga in the West Guilford area (Bancroft terrane).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. (2018)
The Discussion: Monazite Petrochronology (p. 15) reports West Guilford monazite core ages of approximately 1095 and 1080 Ma and says their progression may record prograde metamorphism. It associates peak Ottawan metamorphism with the approximately 1080 Ma domains, rather than establishing a temperature maximum strictly before 1.08 Ga. The claim also states as an observation what the paper presents as an interpretation. (LLM, conf=0.84)
Experimental — accuracy not yet measuredThe onset of erosion may correlate with the deposition of the Flinton Group metasediments in the southernmost part of the hanging wall, as proposed by Markley et al. (2018).
“The onset of erosion may correlate with the deposition of the Flinton Group metasediments in the D r a f t 39 southernmost part of the hanging wall, as proposed by Markley et al. (2018).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. (2018)
The discussion passage (labelled “D r a f t”; page not supplied) places Flinton Group sediment deposition in the CMBbz hanging wall between the Shawinigan and Ottawan orogenies. It does not propose that the onset of erosion correlated with that deposition, so the central correlation attributed to Markley et al. is unsupported. (LLM, conf=0.85)
Experimental — accuracy not yet measuredMarkley et al. (2018) data provided evidence for a late Ottawan event at ca. 1045 Ma that they interpreted to be related to extensional tectonics.
“Specifically their data provided evidence for: i) a well-defined prograde, pre-to late Shawinigan event (i.e., 1220-1160 Ma), ii ) a prograde early Ottawan event (1100-1075 Ma), and iii) a late Ottawan event at ca. 1045 Ma that they interpreted to be related to extensional tectonics.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. (2018)
Markley et al. (2018) data provided evidence for a prograde early Ottawan event (1100-1075 Ma).
“Specifically their data provided evidence for: i) a well-defined prograde, pre-to late Shawinigan event (i.e., 1220-1160 Ma), ii ) a prograde early Ottawan event (1100-1075 Ma), and iii) a late Ottawan event at ca. 1045 Ma that they interpreted to be related to extensional tectonics.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. (2018)
Markley et al. (2018) published monazite U-Th-Pb ages for the Bancroft terrane and the CMBbtz that support the previously interpreted polymetamorphic history.
“Recently, Markley et al. (2018) published monazite U-Th-Pb ages for the Bancroft terrane and the CMBbtz that support the previously interpreted polymetamorphic history.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. (2018)
Published monazite ages and zircon ages of the region indicate that the initial crustal stacking occurred before 1100 Ma.
“Published monazite ages (Markley et al. 2018) and zircon ages (McEachern and van Breemen 1993) of the region indicate that the initial crustal stacking occurred before 1100 Ma.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Markley et al. 2018
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Research works printed but not linked: 27
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Dunn, S. R., Markley, M. J., Kotikian, M., Achenbach, K., Montanye, B., & Peck, W. H. (2019) · American Mineralogist · doi:10.2138/am-2019-6757 · Cited by 11 · see citing works
Self-citationDuesterhoeft, E., Raase, P., Duguet, M., & Easton, R. M. (2021) · Canadian Journal of Earth Sciences · doi:10.1139/cjes-2019-0238 · Cited by 4 · see citing works
- Authors
- Markley, M. J., Dunn, S. R., Jercinovic, M. J., Peck, W. H., & Williams, M. L.
- Affiliations
- Mount Holyoke College (US)
- University of Massachusetts Amherst (US)
- Colgate University (US)
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 2018-09
- Volume
- 55
- Issue
- 9
- Pages
- 1063-1078
- ISSN
- 0008-4077 (ISSN-L)
- 1480-3313
- OpenAlex
- W2803540597
- Cited by
- 14
- References
- 0
- Citations by year
- 2025: 3 · 2024: 4 · 2023: 1 · 2022: 3 · 2020: 2 · 2019: 1
- FWCI
- 0.54
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- Canadian Journal of Earth Sciences (publishedVersion)
- TSpace (University of Toronto) (acceptedVersion)
- Funders
- National Science Foundation (1005122)
- 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
- monazite U-Th-Pb geochronology, Grenville Province, Central Gneiss Belt, shear zone deformation, metamorphism, garnet-biotite gneiss, Ottawan orogeny, crustal thickening, crustal thinning, deformation history
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