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Shawinigan Orogeny

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Journal Article
Journal: GSA Bulletin
Published: 01 November 2006
GSA Bulletin (2006) 118 (11-12): 1283-1298.
... metamorphism. Sensitive high-resolution ion microprobe (SHRIMP) analyses of zircons separated from leucosomes and melanosomes in both the southern highlands and the lowlands indicate that primary anatexis occurred ca. 1180–1160 Ma, and is thus a manifestation of heating during the earlier Shawinigan orogeny...
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Journal Article
Journal: Geosphere
Published: 01 December 2010
Geosphere (2010) 6 (6): 900-916.
...) and smallest epsilon Nd (ε Nd ) values are found in proximity to the Black Lake fault, delineating the extent of Laurentia prior to the Shawinigan orogeny. The epsilon Nd values at crystallization (1200 Ma) plot well below the depleted mantle curve. Geochemical and isotopic similarities to the Hermon granitic...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1713-1728.
... affiliations to the NYF and mixed NYF–LCT pegmatite families. Pegmatites in the Adirondack Lowlands are related to the calc-alkaline arc magmatism of the Antwerp–Rossie granite suite and yield U–Pb zircon crystallization ages that indicate intrusion during the late Shawinigan orogeny (~1195 Ma); currently...
FIGURES
Journal Article
Published: 01 August 2010
The Canadian Mineralogist (2010) 48 (4): 729-750.
...–1140 Ma) of the ca. 1200–1140 Ma Shawinigan orogeny. Emplacement of many other anorthosite – mangerite – charnockite – granite (AMCG) suites also correlates with the waning stage of orogeny and includes the ca. 1155 Ma Morin and Lac-Saint-Jean complexes, the ca. 1650 Ma Mealy Mountain complex...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2008
GSA Bulletin (2008) 120 (7-8): 950-961.
... the late, but still high-grade, ca. 1090–1050 Ma Ottawan orogeny. These results contrast with data from metapelites of the southwestern Adirondack Highlands and Adirondack Lowlands, which indicate that anatexis occurred ca. 1200–1160 Ma, during the Shawinigan orogeny and subsequent (ca. 1155 Ma...
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Journal Article
Journal: Geosphere
Published: 01 December 2011
Geosphere (2011) 7 (6): 1303-1323.
... was synchronous with deformation. This work reveals that the Shawinigan orogeny (1190–1140 Ma) developed the dominant structural features observed in the northwest Adirondack Lowlands. These structures are the result of the northward collision of a rifted slice of the Laurentian margin (Adirondis) into previously...
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Series: GSA Memoirs
Published: 01 September 2010
DOI: 10.1130/2010.1206(02)
... an oblique collision of eastern Laurentia with Amazonia are consistent with paleomagnetic results, and collision is inferred to have begun at ca. 1.2 Ga. The collision resulted in both the ca. 1190–1140 Ma Shawinigan orogeny and the ca. 1090–980 Ma Grenvillian orogeny, which are well represented...
Series: GSA Memoirs
Published: 01 September 2010
DOI: 10.1130/2010.1206(33)
... was contemporaneous with anorthosite-mangerite-charnockite-granite (AMCG) plutonism in the Northern Appalachian inliers and Canadian Grenville Province. Metamorphism at ca. 1160 and 1060 Ma correlates temporally with the Shawinigan orogeny and Ottawan phase of the Grenvillian orogeny, respectively, suggesting...
Journal Article
Journal: Geosphere
Published: 01 December 2013
Geosphere (2013) 9 (6): 1637-1663.
...-alkalic Hermon granite, which may have been generated by melting of metasomatized mantle during collision of the Adirondack Lowlands and Frontenac terrane during the Shawinigan orogeny. The Hyde School gneiss plutons intruded the Adirondack Lowlands at 1.17 Ga, and Rockport granite intruded...
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Journal Article
Journal: Geosphere
Published: 01 December 2012
Geosphere (2012) 8 (6): 1356-1365.
... gneiss yields igneous ages of 1324 ± 38 Ma and 1333 ± 32 Ma (2σ), and one sample shows metamorphic zircon growth during the Shawinigan orogeny at 1159.4 ± 15.6 Ma. Geochemically, Mont-Tremblant gneiss samples are calc-alkaline, granitic, and show hallmarks of an evolved arc environment...
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Journal Article
Published: 01 November 2010
American Mineralogist (2010) 95 (11-12): 1796-1806.
... the Shawinigan orogeny (1.20–1.14 Ga). The average volume of overgrowths in eight samples ranges from 62–87%, with a positive correlation between zircon growth and feldspar content (melt productivity during metamorphism). Melt volumes and Zr solubility were too small to allow the overgrowths to have formed...
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Journal Article
Journal: Geosphere
Published: 01 February 2011
Geosphere (2011) 7 (1): 2-22.
... the waning phases of, the Shawinigan Orogeny), the extent of the Elzevirian Orogeny ( McLelland and Chiarenzelli, 1989 ), the nature and disposition of metasedimentary rocks of the Trans-Adirondack Basin ( Chiarenzelli et al., 2010 ), and the age and origin of major structural features in the Adirondacks...
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Journal Article
Journal: Geosphere
Published: 01 April 2011
Geosphere (2011) 7 (2): 333-356.
..., Shawinigan, and Grenvillian orogenies of Rivers, 2008 ). However, even within a relatively small portion of the orogen such as the Adirondacks, the extent and nature of these events varies significantly ( Heumann et al., 2006 ; Bickford et al., 2008 ). Defining and understanding the tectonic context...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2010
GSA Bulletin (2010) 122 (5-6): 870-883.
...) phase of the GOC, leaving the problem of what caused the pulse of the Shawinigan Orogeny. This problem was not considered by Hanmer et al. (2000) in their reconstruction of the GOC. However, we have modified their reconstruction to show our interpretation of the history for the western Grenville...
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Journal Article
Published: 23 May 2018
Canadian Journal of Earth Sciences (2018) 55 (9): 1063-1078.
... a ), and the Shawinigan Orogeny (1190–1140 Ma) in the Frontenac–Adirondack and Parry Sound regions ( Fig. 1 b ). The active margin culminated in the collisional Grenvillian Orogeny (1090–980 Ma) within the supercontinent Rodinia. The Grenvillian Orogeny can be subdivided into two phases ( Rivers et al. 2012 ; Rivers...
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Journal Article
Journal: GSA Bulletin
Published: 06 July 2017
GSA Bulletin (2017) 129 (11-12): 1472-1488.
..., 2015 ; Walsh et al., 2016 ), which would make it temporally associated with the Shawinigan, rather than Ottawan, orogeny. This discrepancy is related to the interpretation of complex zircon grains that often display cores and thick mantles. In addition, a conspicuous planar fabric is often present...
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Series: GSA Field Guides
Published: 29 March 2018
DOI: 10.1130/2018.0050(08)
EISBN: 9780813756509
... in western North Carolina and southwestern Virginia are granitic orthogneisses with either ca. 1050 or ca. 1150 Ma crystallization ages ( Southworth et al., 2010 ; Tollo et al., 2010 ), which correspond to the Ottawan and Shawinigan phases of the Grenville orogeny, respectively ( Rivers, 1997 , 2008...
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Journal Article
Journal: Geosphere
Published: 01 June 2011
Geosphere (2011) 7 (3): 694-709.
... ). On the northwestern side of this boundary, the Adirondack Lowlands were metamorphosed to upper amphibolite facies during the Shawinigan orogeny (ca. 1210–1160 Ma), but evidence for Ottawan deformation has yet to be observed. The Highlands, southeast of the Carthage-Colton mylonite zone, were affected...
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Journal Article
Journal: GSA Bulletin
Published: 30 June 2017
GSA Bulletin (2017) 129 (11-12): 1408-1423.
... episodes of siliciclastic influx, represented by the Escape Rapids Formation and the younger Nelson Head Formation (Rae Group), correspond with periods of uplift and erosional unroofing that would have followed the two main phases of the Grenvillian orogeny, the Shawinigan (ca 1200–1140 Ma) and the Ottawan...
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Journal Article
Published: 01 July 2013
American Mineralogist (2013) 98 (7): 1106-1119.
... are enriched in LREE and depleted in HREE compared to detrital cores. The U and Th concentrations are low, typical of low-grade metamorphic conditions. Monazite core ages yield Proterozoic ages between 1.17 and 0.90 Ga (Shawinigan and Ottawan orogeny). Monazite overgrowth and xenotime ages indicate four...
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