Thermobarometry, Geochronology and the Interpretation of P-T-t Data in the Britt Domain, Ontario Grenville Orogen, Canada
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Textural evidence, thermobarometry, and geochronology were used to constrain the pressure-temperature-time (P—T—t) history of the southern portion of the Britt domain in the Central Gneiss Belt, Ontario Grenville Province. Typical metapelitic assemblages are quartz+plagioclase+ biotite + garnet + kyanite ± alkali feldspar ± sillimanite ± rutile ± ilmenite ±staurolite ± gahnite ± muscovite. Metatonalitic assemblages have quartz + plagioclase + garnet ± biotite + hornblende + rutile + ilmenite. Metagabbroic rocks contain plagioclase + garnet + clinopyroxene + biotite + ilmenite ± hornblende ± rutile± quartz. Notable textural features include overgrowths of sillimanite on kyanite and of spinel on staurolite. The spinel overgrowths can be modeled by the breakdown of staurolite via the reaction Fe-staurolite = hercynite +kyanite + quartz + H2O. The decomposition of staurolite to her-cynite has a steep dP/dT slope and constrains the late prograde path of a staurolite metapelite. Garnet—Al2SiO5—plagioclase—quartz (GASP) barometry applied to metapelitic garnets that preserve calcium zoning reveals a pressure decrease from ∼ 11 to 6 kb at an assumed temperature of 700 °C. Garnet—plagioclase—ilmenite—rutile—quartz and garnet—clinopyroxene—plagioclase—quartz barometry is in good agreement with pressures obtained with the GASP barometer. Geochronologic data from garnet, allanite, and monazite in metapelitic rocks give ages that fall into two groups, ∼ 1–4 Ga and ∼ 1.1 Ga, suggesting the presence of at least two metamorphic events in the area. It is most reasonable to assign the 1.4 Ga age to the high-pressure data and the 1.1 Ga age to the lower-pressure data. Collectively the P—T—t data indicate a complex and protracted history rather than a single cycle of burial and uplift for this part of the Grenville Province.
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Upper amphibolite- and granulite-facies metamorphism in Parry Sound domain has been dated at c. 1160 Ma and c. 1120 Ma, predating that in the underlying Algonquin terrane, although retrogression to amphibolite-facies assemblages is widespread.
“Upper amphiboliteand granulite-facies metamorphism in Parry Sound domain has been dated at c45 1160 Ma and c45 1120 Ma (van Breemen et al. 1986; Tuccillo et al. 1992), predating that in the underlying Algonquin terrane, although retrogression to amphibolite-facies assemblages is widespread (Culshaw et al. 1997).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Tuccillo et al. 1992
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Experimental — accuracy not yet measuredThe Parry Sound shear zone, with estimated timing of thrust displacement 1160-1120 Ma, is an exception to the general northwest-younging pattern.
“The Parry Sound shear zone, for which the estimated timing of thrust displacement is 1160-1120 Ma (van Breemen et al. 1986; Tuccillo et al. 1992), is an exception to this pattern.”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Tuccillo et al. 1992
The GEOCHRONOLOGY passage dates syn-deformational pegmatites in the Parry Sound Shear Zone to 1159–1121 Ma, supporting thrust activity around 1160–1120 Ma. But the DISCUSSION says thrusting began around 1160 Ma and lasted past 1078 Ma, so 1160–1120 Ma does not capture its full estimated duration. The passages do not assess whether the zone is an exception to the citing paper’s northwest-younging pattern. Page numbers were not supplied. (LLM, conf=0.87)
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Research works printed but not linked: 11
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- Easton, R. M., 1986. Geochronology of the Grenville Province. Part I: Compilation of data; Part II: Synthesis and interpretatioa In: Moore, J. M., Davidson, A., & Baer, A. J. (eds.) The Grenville Province. Geol. Assoc. Can. Spec. Paper 31, 191-207.
- Essene, E. J., 1989. The current status of thermobarometry in metamorphic rocks. In: Daly, J. S., Cliff, R. A., & Yardley, B. W. D. (eds.) Evolution of Metamorphic Belts. Geol. Soc. bond. Spec. Publ. 43, 1-44.
- Perkins, D., 1990. Thermometry and barometry of mafic granulites based on garnet-clinopyroxene- plagioclase-quartz assemblages. In: Vielzeuf, D., & Vidal, Ph. (eds.) Granulites and Crustal Evolution. NATO Advanced Sciences Institutes, Series C: Mathematical and Physical Sciences, 311. Dordrecht: Kluwer, 435-49.
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Pattison, D. R. M. (2003) · Journal of Metamorphic Geology · doi:10.1046/j.1525-1314.2003.00415.x · Cited by 191 · see citing works
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
- Authors
- TUCCILLO, M. E., MEZGER, K., ESSENE, E. J., & VAN DER PLUIJM, B. A.
- Affiliations
- University of Bern (CH)
- Max Planck Society (DE)
- Venue
- Journal of Petrology
- Publisher
- Oxford University Press (OUP)
- Published
- 1992-12-01
- Volume
- 33
- Issue
- 6
- Pages
- 1225-1259
- ISSN
- 0022-3530 (ISSN-L)
- 1460-2415
- OpenAlex
- W2330012554
- Cited by
- 51
- References
- 0
- Citations by year
- 2024: 1 · 2023: 2 · 2022: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2014: 2 · 2013: 3 · 2012: 1
- FWCI
- 3.30
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Petrology (publishedVersion)
- Bern Open Repository and Information System (University of Bern) (submittedVersion, other-oa)
- Open Access CRIS of the University of Bern
- Funders
- National Science Foundation (9004302, 8212764, 8805083, 8903805)
- University of Michigan
- 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
- thermobarometry, geochronology, Central Gneiss Belt, Grenville orogen, hercynite, garnet zoning, metagabbro, high-pressure metamorphism
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