Eclogitized gabbros from the eastern Grenville Province: textures, metamorphic context, and implications
Abstract
Undeformed lenses of olivine–orthopyroxene–gabbro belonging to the 1429 Ma Shabogamo Intrusive Suite (Parautochthonous Belt of the eastern Grenville Province) host the first occurrence of eclogite mineral assemblages reported from the Grenville Province. These rocks preserve igneous textures overprinted by eclogite mineralogy and by textures related to subsequent unloading. High-pressure signatures include omphacite pseudomorphs after augite, plagioclase replacement by garnet + kyanite + corundum, and orthopyroxene–omphacite–garnet coronas between olivine and plagioclase. Transformations related to decompression include replacement of garnet + kyanite + corundum by spinel + plagioclase, growth of plagioclase collars between clinopyroxene and garnet, and de-jadeitization of omphacite. Clinopyroxenes with numerous plagioclase inclusions and garnets surrounded by clinopyroxene–plagioclase symplectites in granoblastic mafic rocks from the same area are also evidence of decompression from high pressures. These rocks record pressure–temperature (P–T) conditions of 1600 MPa at 700–800 °C and steep subsequent P–T paths. It is suggested that the entire parautochthon in this part of the Grenville Province experienced deep burial during the Grenvillian metamorphism. In contrast, the Grenvillian metamorphic signature in the overlying allochthonous sheet is known to be minor, thus precluding any relationship between its emplacement and very high Grenvillian pressures in the parautochthon.
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Evidence for HP metamorphism in Molson Lake terrane is best preserved in the dry interiors of the gabbro dykes, which display a spectacular range of corona assemblages.
“Evidence for HP metamorphism is best preserved in the dry interiors of the gabbro dykes, which display a spectacular range of corona assemblages (Rivers and Mengel 1988; Indares 1993; Indares and Rivers 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Indares 1993
Estimated conditions of HP metamorphism range from 1400 MPa / 750°C in the north of Molson Lake terrane to 1800 MPa and 850°C farther south.
“Estimated conditions of HP metamorphism range from 1400 MPa / 750°C in the north of Molson Lake terrane to 1800 MPa and 850°C farther south (Indares 1993; Indares and Rivers 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Indares 1993
Jadeitic pyroxene in both coronitic and granoblastic eclogite is locally preserved, with up to 51 mol.% jadeite in corona gabbro in Molson Lake terrane and 33 mol.% jadeite in granoblastic eclogite in Tshenukutish terrane.
“jadeitic pyroxene in both coronitic and granoblastic eclogite is locally preserved, e.g., up to 51 mol.% jadeite in corona gabbro in Molson Lake terrane (Indares 1993; Indares and Rivers 1995), and 33 mol.% jadeite in granoblastic eclogite in Tshenukutish terrane (Cox and Indares 1999 a ).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Indares 1993
Pyroxenes in other spatially associated HP rocks have low jadeite contents due to low Na bulk compositional controls and are strictly HP granulites.
“However, pyroxenes in other spatially associated HP rocks have low jadeite contents due to low Na bulk compositional controls and are strictly HP granulites (Indares 1993).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Indares 1993
Cited by
Sorted by citations
Blueschists and eclogites of the world and their exhumation
Maruyama, S., Liou, J. G., & Terabayashi, M. (1996) · International Geology Review · doi:10.1080/00206819709465347 · Cited by 625 · see citing works
Jahn, B.-M., Caby, R., & Monie, P. (2001) · Chemical Geology · doi:10.1016/s0009-2541(01)00264-9 · Cited by 159 · 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
Self-citation
- Authors
- Indares, A.
- Corresponding author
- Indares, Aphrodite
- ORCID
- Indares, Aphrodite
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 1993-01-01
- Volume
- 30
- Issue
- 1
- Pages
- 159-173
- ISSN
- 0008-4077 (ISSN-L)
- 1480-3313
- OpenAlex
- W2027736477
- Cited by
- 77
- References
- 0
- Citations by year
- 2024: 1 · 2023: 2 · 2022: 1 · 2020: 1 · 2018: 12 · 2017: 3 · 2016: 1 · 2015: 2 · 2014: 1 · 2013: 1
- FWCI
- 3.21
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Canadian Journal of Earth Sciences (publishedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Keywords
- eclogite, gabbro, Grenville Province, high-pressure metamorphism, decompression, omphacite, garnet, kyanite, clinopyroxene, symplectites, pressure-temperature conditions, deep burial
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