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Plutonic ages and tectonic setting of the Algonquin and Muskoka allochthons, Central Gneiss Belt, Grenville Province, Ontario

Nadeau, Léopold, van Breemen, Otto·1998·Canadian Journal of Earth Sciences
DOI 10.1139/e98-077
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Abstract

The Central Gneiss Belt comprises parautochthonous gneisses overlain by northwest-transported allochthonous terranes originating from the pre-Grenvillian Laurentian margin or from farther outboard as inferred for the Parry Sound allochthon. In the Huntsville region, orthogneisses of the Algonquin allochthon yielded U-Pb zircon igneous crystallization ages at 1444 +12-8, 1442 +9-8, and 1432 +54-98 Ma. In absence of direct evidence for older intrusions, the association of these plutonic rocks with gneisses giving Nd crustal residence ages of ca. 1.7 Ga sets the Algonquin allochthon apart from the underlying parautochthon, and from the overlying Muskoka allochthon. Orthogneisses from the latter also give zircon igneous ages at 1453 ± 6 Ma and 1427 +16-13 Ma, with no older memory. These ages closely correspond to the Nd model ages of associated gneisses, testifying to the juvenile nature of this terrane. Plutonic ages from the Algonquin and Muskoka allochthons are older than those of the Parry Sound allochthon to the northwest, thereby confirming its exotic nature. The importance, distribution, and nature of 1475-1410 Ma plutonism down structural section from the juvenile Muskoka allochthon, via the more mature Algonquin allochthon, into the parautochthon and Grenville foreland, testify to the development of an ensialic arc along that part of the Laurentian margin tectonically incorporated in the Central Gneiss Belt. Furthermore, the age and structural relationship require Grenvillian break-back thrust reactivation to account for the high structural position of the Muskoka allochthon, which was part of the Laurentian ramp during overthrusting of the younger and farther travelled Parry Sound allochthon.

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  • The HP terranes consist of Paleo- and Mesoproterozoic metagranitoid rocks emplaced during two magmatic episodes at c45 1715-1600 and c45 1470-1430 Ma.

    “The HP terranes, which appear to lack units of Archean age, consist of Paleo- and Mesoproterozoic metagranitoid rocks emplaced during two magmatic episodes at c45 1715-1600 and c45 1470-1430 Ma (Krogh 1991; Nadeau and van Breemen 1998; Ketchum and Davidson 2000).”

    From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Nadeau and van Breemen 1998

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Authors
Nadeau, L., & van Breemen, O.
Venue
Canadian Journal of Earth Sciences
Publisher
Canadian Science Publishing
Published
1998-12-01
Volume
35
Issue
12
Pages
1423-1438
ISSN
  • 0008-4077 (ISSN-L)
  • 1480-3313
DOI
10.1139/e98-077
OpenAlex
W2044197003
Cited by
29
References
0
Citations by year
2024: 2 · 2022: 2 · 2019: 1 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 3 · 2013: 1 · 2012: 1
FWCI
1.03
Type
journal article
Language
en
Open access
closed
Licence
www.nrcresearchpress.com/page/about/CorporateTextAndDataMining (tdm)
Locations
Canadian Journal of Earth Sciences (publishedVersion)
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
Central Gneiss Belt, Grenville Province, zircon U-Pb geochronology, Nd model ages, crustal residence age, Laurentian margin, overthrusting, Grenville orogeny, tectonic setting

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