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Antigonish Highlands

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Book Chapter

The genetic relationship between coeval Ediacaran mafic and granitoid plutons in the Antigonish Highlands, Nova Scotia Available to Purchase

Author(s)
Donnelly B. Archibald, J. Brendan Murphy, Robert A. Creaser
Book: Supercontinents, Orogenesis and Magmatism
Series: Geological Society, London, Special Publications
Publisher: Geological Society of London
Published: 22 April 2024
DOI: 10.1144/SP542-2023-31
EISBN: 9781786206398
... Fig. 4. Representative field photographs of leucocratic dykes in the Greendale Complex and granitic plutons in the Antigonish Highlands: ( a ) leucocratic dyke cross-cutting porphyritic appinite in the Greendale Complex, ( b ) leucocratic dyke cross-cutting coarse-grained appinite...
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Abstract
View PDF for content titled, The genetic relationship between coeval Ediacaran mafic and granitoid plutons in the <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia
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Abstract Granitic plutons dominated by felsic-intermediate compositions are commonly spatially and temporally associated with mafic intrusions; however, the genetic relationship between the apparently coeval but compositionally dissimilar magmas is controversial. To better understand this relationship, we present new lithogeochemical and isotopic data from coeval late Neoproterozoic plutonic rocks in the Antigonish Highlands of Nova Scotia where the regional context is well documented. The predominantly mafic Greendale Complex contains lamprophyre, appinites and leucocratic dykes. The appinites are remarkably variable in their textures, and consist of hornblende pegmatites, hornblende cumulates, porphyritic hornblende gabbro and coarse-grained, equigranular hornblende gabbro. Geochemical data show enrichment in large-ion lithophile elements and depletion in the high field strength elements suggesting an arc setting. ε Nd (607) values from the Greendale Complex range from +3.2 to +5.0 and are on average slightly more juvenile than coeval granitic rocks which have petrological characteristics typical of continental arc magmas. Hydrous mafic magmas were likely contaminated by subducted sediments and their ascent was facilitated by lithospheric-scale faults. Felsic magmas were derived by anatexis of heterogeneous Avalonian crust that oscillated between fluid-saturated to fluid-deficient (dehydration) melting, consistent with the evolution from arc to intra-arc rift environment.

Journal Article

Age and tectonic setting of Neoproterozoic granitoid rocks, Antigonish Highlands, Nova Scotia, Canada: implications for Avalonia in the northern Appalachian orogen Available to Purchase

C.E. White, S.M. Barr, M.A. Hamilton, J.B. Murphy
Published: 05 November 2020
Canadian Journal of Earth Sciences (2021) 58 (4): 396–412.
DOI: https://doi.org/10.1139/cjes-2020-0110
...C.E. White; S.M. Barr; M.A. Hamilton; J.B. Murphy The oldest rocks in the Avalonian Antigonish Highlands of northern mainland Nova Scotia, Canada, are late Neoproterozoic (>618 Ma) volcanic and sedimentary rocks of the Georgeville Group intruded by gabbroic/dioritic to granitic plutons. New U–Pb...
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View PDF for article title, Age and tectonic setting of Neoproterozoic granitoid rocks, <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia, Canada: implications for Avalonia in the northern Appalachian orogen
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Journal Article

Field relationships, petrology, age, and tectonic setting of the Late Cambrian–Ordovician West Barneys River Plutonic Suite, southern Antigonish Highlands, Nova Scotia, Canada Available to Purchase

D.B. Archibald, S.M. Barr, J.B. Murphy, C.E. White, T.G. MacHattie, E.A. Escarraga, M.A. Hamilton, C.R.M. McFarlane
Published: 26 February 2013
Canadian Journal of Earth Sciences (2013) 50 (7): 727–745.
DOI: https://doi.org/10.1139/cjes-2012-0158
... outcropping in an area of ∼100 km 2 in the southern Antigonish Highlands. Magma mixing and mingling textures indicate a comagmatic relationship between some of the mafic and intermediate–felsic lithologies. However, nine U–Pb (zircon) ages, three by thermal ionization mass spectrometry (TIMS) and six by laser...
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View PDF for article title, Field relationships, petrology, age, and tectonic setting of the Late Cambrian–Ordovician West Barneys River Plutonic Suite, southern <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia, Canada
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Journal Article

Tectonic significance of Late Ordovician silicic magmatism, Avalon terrane, northern Antigonish Highlands, Nova Scotia 1 This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology. 2 Contribution to International Geological Correlation Programme (IGCP) Project 497. Available to Purchase

J. Brendan Murphy, Michael A. Hamilton, Bryan LeBlanc
Published: 19 December 2011
Canadian Journal of Earth Sciences (2012) 49 (1): 346–358.
DOI: https://doi.org/10.1139/e11-012
...J. Brendan Murphy; Michael A. Hamilton; Bryan LeBlanc Abstract Avalonia was a microcontinent during most of the Ordovician, separating the Iapetus Ocean to the north from the Rheic Ocean to the south. In the northern Antigonish Highlands, Nova Scotia, volcanic rocks (Dunn Point and McGillivray...
View PDF for article title, Tectonic significance of Late Ordovician silicic magmatism, Avalon terrane, northern <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia 1 This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology. 2 Contribution to International Geological Correlation Programme (IGCP) Project 497.
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Add to Citation Manager for Tectonic significance of Late Ordovician silicic magmatism, Avalon terrane, northern <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia 1 This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology. 2 Contribution to International Geological Correlation Programme (IGCP) Project 497.
Journal Article

Ordovician A-type plutons in the Antigonish Highlands, Nova Scotia 1 This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology. Available to Purchase

E.A. Escarraga, S.M. Barr, J.B. Murphy, M.A. Hamilton
Published: 14 December 2011
Canadian Journal of Earth Sciences (2012) 49 (1): 329–345.
DOI: https://doi.org/10.1139/e11-026
...E.A. Escarraga; S.M. Barr; J.B. Murphy; M.A. Hamilton Abstract Previously unrecognized A-type granitoid and gabbroic rocks cover an area of ∼100 km 2 in the central Antigonish Highlands in Avalonian northern mainland Nova Scotia. The granitoid rocks in this suite occur, together with minor gabbro...
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View PDF for article title, Ordovician A-type plutons in the <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia 1 This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.
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Add to Citation Manager for Ordovician A-type plutons in the <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia 1 This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.
Journal Article

Postorogenic alkali feldspar granite and associated pegmatites in West Avalonia: the petrology of the Neoproterozoic Georgeville Pluton, Antigonish Highlands, Nova Scotia Free

J Brendan Murphy, Alan J Anderson, Doug A Archibald
Published: 01 February 1998
Canadian Journal of Earth Sciences (1998) 35 (2): 110–120.
DOI: https://doi.org/10.1139/e97-099
Add to Citation Manager for Postorogenic alkali feldspar granite and associated pegmatites in West Avalonia: the petrology of the Neoproterozoic Georgeville Pluton, <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia
Book Chapter

Tectonic influence on late Proterozoic Avalonian magmatism: An example from the Greendale Complex, Antigonish Highlands, Nova Scotia, Canada Available to Purchase

Author(s)
J. Brendan Murphy, Andrew J. Hynes, Brian L. Cousens
Book: The Nature of Magmatism in the Appalachian Orogen
Publisher: Geological Society of America
Published: 01 January 1997
DOI: 10.1130/0-8137-1191-6.255
Abstract
View PDF for content titled, Tectonic influence on late Proterozoic Avalonian magmatism: An example from the Greendale Complex, <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia, Canada
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Journal Article

Geochemical and isotopic characteristics of Early Silurian clastic sequences in Antigonish Highlands, Nova Scotia, Canada: constraints on the accretion of Avalonia in the Appalachian – Caledonlde Orogen Free

J. Brendan Murphy, J. Duncan Keppie, Mary Pat Cude, Jarda Dostal, John W. F. Waldron
Published: 01 March 1996
Canadian Journal of Earth Sciences (1996) 33 (3): 379–388.
DOI: https://doi.org/10.1139/e96-028
... the characteristics of the underlying continental basement and mantle) and sedimentary rocks (which reflect provenance). Early Silurian clastic sedimentary rocks of the Beechill Cove Formation, Antigonish Highlands, Nova Scotia, were deposited on Avalonian crust. The formation predominantly consists of approximately...
Add to Citation Manager for Geochemical and isotopic characteristics of Early Silurian clastic sequences in <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia, Canada: constraints on the accretion of Avalonia in the Appalachian – Caledonlde Orogen
Book Chapter

Repeated late Neoproterozoic-Silurian lower crustal melting beneath the Antigonish Highlands, Nova Scotia: Nd isotopic evidence and tectonic interpretations Available to Purchase

Author(s)
J. B. Murphy, J. D. Keppie, J. Dostal, B. L. Cousens
Book: Avalonian and related peri-Gondwanan terranes of the Circum-North Atlantic
Publisher: Geological Society of America
Published: 01 January 1996
DOI: 10.1130/0-8137-2304-3.109
Abstract
View PDF for content titled, Repeated late Neoproterozoic-Silurian lower crustal melting beneath the <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia: Nd isotopic evidence and tectonic interpretations
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Journal Article

Geochemistry and tectonic discrimination of Late Proterozoic arc-related volcaniclastic turbidite sequences, Antigonish Highlands, Nova Scotia Free

J. Brendan Murphy, Deborah L. MacDonald
Published: 01 December 1993
Canadian Journal of Earth Sciences (1993) 30 (12): 2273–2282.
DOI: https://doi.org/10.1139/e93-197
Add to Citation Manager for Geochemistry and tectonic discrimination of Late Proterozoic arc-related volcaniclastic turbidite sequences, <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia
Journal Article

Tectonic control on the origin and orientation of igneous layering: An example from the Greendale Complex,Antigonish Highlands, Nova Scotia, Canada Available to Purchase

J. Brendan Murphy, Andrew J. Hynes
Journal: Geology
Published: 01 May 1990
Geology (1990) 18 (5): 403–406.
DOI: https://doi.org/10.1130/0091-7613(1990)018<0403:TCOTOA>2.3.CO;2
...J. Brendan Murphy; Andrew J. Hynes Abstract Layering in appinites (hornblende-rich gabbros) of the ca. 610 Ma Greendale Complex, Antigonish Highlands, Nova Scotia, is defined by variations in texture and modal abundances of hornblede and plagioclase, and ranges in width from 5 to 50 cm. Regional...
View PDF for article title, Tectonic control on the origin and orientation of igneous layering: An example from the Greendale Complex,<span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span>, Nova Scotia, Canada
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Journal Article

Late Precambrian to Late Devonian mafic magmatism in the Antigonish Highlands of Nova Scotia: multistage melting of a hydrated mantle Free

J. Brendan Murphy
Published: 01 April 1988
Canadian Journal of Earth Sciences (1988) 25 (4): 473–485.
DOI: https://doi.org/10.1139/e88-048
...J. Brendan Murphy Abstract Five suites of alkalic basalt ranging in age from Late Precambrian to Late Devonian are found in the Antigonish Highlands of Nova Scotia. In contrast, on neighbouring Cape Breton Island, alkalic basalts are rare even in suites that are contemporaneous with those...
Add to Citation Manager for Late Precambrian to Late Devonian mafic magmatism in the <span class="search-highlight">Antigonish</span> <span class="search-highlight">Highlands</span> of Nova Scotia: multistage melting of a hydrated mantle
Journal Article

Petrology of Upper Ordovician – Lower Silurian rocks of the Antigonish Highlands, Nova Scotia Free

J. B. Murphy
Published: 01 April 1987
Canadian Journal of Earth Sciences (1987) 24 (4): 752–759.
DOI: https://doi.org/10.1139/e87-073
...J. B. Murphy Abstract Upper Ordovician to Lower Silurian rocks in the Antigonish Highlands consist of interlayered basalts, rhyodacites, arkoses, and conglomerates overlain by a thick sequence of marine clastic rocks and minor rhyolites. The stratigraphy documents a marine transgression...
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Journal Article

A microfauna associated with Early Cambrian trilobites of the Callavia Zone, norther Antigonish Highlands, Nova Scotia Free

Ed Landing, Godfrey S. Nowlan, Terence P. Fletcher
Published: 01 March 1980
Canadian Journal of Earth Sciences (1980) 17 (3): 400–418.
DOI: https://doi.org/10.1139/e80-038
... Antigonish Highlands with less intensely deformed portions of the Avalonian Platform is indicated by: (1) the Avalonian character of the trilobites and Early Ordovician brachiopods, (2) the nature of the lithologic sequence of the Iron Brook Group, and (3) local evidence for a Hadrynian orogeny...
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Image
Simplified geological map of the Antigonish Highlands with distribution of geological units based on the published map by White (2017). Numbers in boxes indicate radiometric age data from Neoproterozoic plutonic units, including previous ages (in italics) and new ages presented in this paper. Sources for previously published data are cited in the text. hb, hornblende; mu, muscovite; zr, zircon. [Colour online.]

Simplified geological map of the Antigonish Highlands with distribution of ... Available to Purchase

Published: 05 November 2020
Fig. 2. Simplified geological map of the Antigonish Highlands with distribution of geological units based on the published map by White (2017) . Numbers in boxes indicate radiometric age data from Neoproterozoic plutonic units, including previous ages (in italics) and new ages presented
Image
Samples from Neoproterozoic plutons of the Antigonish Highlands plotted on tectonic setting discrimination diagrams for granitoid rocks. Only intermediate and felsic samples (&gt;60% SiO2) are included. Symbols are as in Fig. 5. Fields in Fig 8a are after Pearce et al. (1984) and Pearce (1996). Fields in Fig. 8b are as modified from Pearce et al. (1984) by Hildebrand and Whalen (2015) and Hildebrand et al. (2018). Data are from Escarraga (2010), Murray (2011), MacFadzen (2012), and Supplementary Table S11. [Colour online.]

Samples from Neoproterozoic plutons of the Antigonish Highlands plotted on ... Available to Purchase

Published: 05 November 2020
Fig. 8. Samples from Neoproterozoic plutons of the Antigonish Highlands plotted on tectonic setting discrimination diagrams for granitoid rocks. Only intermediate and felsic samples (>60% SiO 2 ) are included. Symbols are as in Fig. 5 . Fields in Fig 8 a are after Pearce et al. (1984
Image
Geological map of the northern Antigonish highlands, Nova Scotia (after Murphy et al. 1998). The arrow shows the location of the Georgeville granite.

Geological map of the northern Antigonish highlands, Nova Scotia (after Mu... Available to Purchase

Published: 01 February 2008
F ig . 1. Geological map of the northern Antigonish highlands, Nova Scotia (after Murphy et al. 1998 ). The arrow shows the location of the Georgeville granite.
Image
Figure 1. Summary geological map of Antigonish Highlands (from Murphy et al., 1991). Age dates quoted are U-Pb (zircon, thermal ionization mass spectrometry). A is Avalonia (dark shade). Reconstructions for 600 Ma, 540 Ma, 460 Ma, and 370 Ma (modified after Stampfli and Borel, 2002) show paleogeographic locations of Clydesdale, Arbuckle, Bears Brook–Dunn Point, and McArras Brook Formations, respectively. SCLM— subcontinental lithospheric mantle; CF—Clydesdale Formation; AB—Arbuckle Brook Formation; DP— Dunn Point Formation; BB—Bears Brook formation; Mc—McArras Brook Formation.

Figure 1. Summary geological map of Antigonish Highlands (from Murphy et a... Available to Purchase

Published: 01 April 2007
Figure 1. Summary geological map of Antigonish Highlands (from Murphy et al., 1991 ). Age dates quoted are U-Pb (zircon, thermal ionization mass spectrometry). A is Avalonia (dark shade). Reconstructions for 600 Ma, 540 Ma, 460 Ma, and 370 Ma (modified after Stampfli and Borel, 2002 ) show
Image
Simplified geological maps of (A) the Antigonish Highlands of northern mainland Nova Scotia (modified from Murphy et al. 1991). Location of B is shown as an inset. Insets W and S refer to regions of the Arisaig Group in the western and southern Antigonish Highlands, respectively. (B) the Arisaig Group in the type area northern Antigonish Highlands (after Boucot et al. 1974) and the undeformed middle Devonian rocks of McArras Brook to the southwest. Localities selected for detailed structural analysis are highlighted.

Simplified geological maps of (A) the Antigonish Highlands of northern main... Available to Purchase

Published: 07 March 2005
Fig. 1. Simplified geological maps of (A) the Antigonish Highlands of northern mainland Nova Scotia (modified from Murphy et al. 1991 ). Location of B is shown as an inset. Insets W and S refer to regions of the Arisaig Group in the western and southern Antigonish Highlands, respectively. (B
Image
Figure 2. Tectonostratigraphy of the Antigonish Highlands (modified from Murphy et al., 1991; Murphy and Nance, 2002). The Arisaig Group is 440–380 Ma, and its depositional environment is classified as a syn- to postcollisional rift basin. LST—limestone.

Figure 2. Tectonostratigraphy of the Antigonish Highlands (modified from M... Available to Purchase

Published: 01 September 2004
Figure 2. Tectonostratigraphy of the Antigonish Highlands (modified from Murphy et al., 1991 ; Murphy and Nance, 2002 ). The Arisaig Group is 440–380 Ma, and its depositional environment is classified as a syn- to postcollisional rift basin. LST—limestone.