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Dashwoods Terrane

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Series: GSA Special Papers
Published: 19 May 2022
DOI: 10.1130/2021.2554(10)
EISBN: 9780813795546
...—Little Codroy Pond ( Fig. 2D ). CRF—Cape Ray fault; LGLF—Little Grand Lake fault; CF—Cabot fault; HRF—Humber River fault. Figure 2. Geologic maps showing sampled units and sampling locations from southern Dashwoods terrane. (A) Cormacks Lake Complex at Cormacks Lake (modified after van Staal...
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Series: GSA Special Papers
Published: 19 May 2022
DOI: 10.1130/2022.2554(09)
EISBN: 9780813795546
... rapidly succeeded each other between 465 and 445 Ma ( van Staal et al., 2007 , 2009 , 2013 ; van Staal and Zagorevski, 2020) . Late Ordovician–early Silurian exhumation along this transect was relatively mild compared to a southern transect through the Dashwoods terrane (see van Staal et al., 2007...
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Journal Article
Journal: Economic Geology
Published: 01 August 2015
Economic Geology (2015) 110 (5): 1215–1234.
.... The deposit was intensely deformed at low temperature but medium pressure (>175 MPa) during the accretion of the composite Lushs Bight oceanic tract-Dashwoods terrane onto the Humber margin at ca. 480 Ma. The ore mineralogy consists of chalcopyrite, pyrrhotite, and pyrite with lesser sphalerite and trace...
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Image
Paleogeographic map of late Hirnantian–early Rhuddanian times showing posit...
Published: 01 November 2021
is used. Abbreviations: BL, Brompton Line; BVL, Baie Verte Line; C Nfl., Central Newfoundland Terrane; Dashw, Dashwoods Terrane; E. Avalonia, East Avalonia; E Nfl., East Newfoundland; Expl, Exploits Zone; Fm, Formation; Kilb, Kilbucho; Leins, Leinster-Lakesman Terrane; Monian C, Monian Composite Terrane
Journal Article
Published: 01 September 2005
The Journal of Geology (2005) 113 (5): 553–570.
...C. Johan Lissenberg; Alexandre Zagorevski; Vicki J. McNicoll; Cees R. van Staal; Joseph B. Whalen Abstract The Annieopsquotch Accretionary Tract (AAT) comprises several ophiolites and arc-back-arc igneous complexes that were accreted to the Dashwoods microcontinent during the Ordovician Taconic...
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Journal Article
Journal: GSA Bulletin
Published: 28 February 2022
GSA Bulletin (2022) 134 (11-12): 2790–2808.
... terrane (a.k.a., the “Precordillera terrane” is commonly believed to have accreted to the proto-Andean margin of Gondwana, whereas the peri-Laurentian/Dashwoods ribbon continent separated from, then re-accreted to, the Laurentian margin after being trapped during the collision of the Taconic arc...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP327.13
EISBN: 9781862395756
... of the Humber margin and outboard peri-Laurentian terranes. Modified from van Staal et al. (2007) . ( a ) Subduction initiation (using an abandoned spreading ridge, see van Staal et al. 2007 ) and rapid hinge retreat of the east-dipping (present co-ordinates) Dashwoods plate is responsible for formation...
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Series: Geological Society, London, Special Publications
Published: 04 October 2023
DOI: 10.1144/SP531-2022-152
EISBN: 9781786209634
... significantly earlier than the inboard margin in several places. For example, Furongian to Floian plutons (488–476 Ma) of the Notre Dame arc in Newfoundland stitched ophiolitic- and deformed, inferred Laurentian-derived metasedimentary rocks of the Dashwoods terrane as early as 488 Ma, if not earlier at c...
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Journal Article
Published: 01 August 2000
Mineralogical Magazine (2000) 64 (4): 711–724.
... in the Central Gneiss (Dashwoods) subzone, in the southwestern Newfoundland Appalachians. Retrograde features formed at the expense of the granulite-facies assemblages are ubiquitous. For example, in some migmatitic rocks, garnet is resorbed by Crd+Oam, and in metapelites, cordierite separates corroded garnet...
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Series: GSA Special Papers
Published: 19 May 2022
DOI: 10.1130/2022.2554(001)
EISBN: 9780813795546
.... (Chapter 10) interpret the tectonic history of the Dashwoods terrane of western Newfoundland on the basis of U-Pb geochronology. Using results from detrital zircon from sedimentary rocks and inherited zircon from igneous rocks, they challenge the correlation of the Dashwoods terrane with Laurentia...
Image
Figure 10. Schematic paleogeographic reconstructions at (A) 600 Ma; (B) 570...
Published: 01 April 2001
and Ortega-Gutiérrez, 1999 ), and the Dashwoods block. The Pampean terrane may have developed outboard of Rio de la Plata and remained with west Gondwana as a marginal plateau after Iapetus opening ( Rapela et al., 1998 ); a—highlights position of possible terrane off Newfoundland, b—location of Argentine
Image
Delimitation of rift-related magmatic pulses at 750–680 Ma (purple) and 615...
Published: 05 June 2020
. (2008) ; AM and BA are moved slightly southward to take into account the pre-Scandian extent of west BA, and to include the small terranes between LA and AM. Esp—Eastern Sierras Pampeanas; Wsp—Western Sierras Pampeanas; AAB—Arequipa-Antofalla block; RP—Rio de la Plata; Dr—Dashwoods ribbon; Y—Yucatan; S
Journal Article
Journal: Geology
Published: 01 June 2014
Geology (2014) 42 (6): 539–542.
... belt, and possibly portions of the Eastern belt and allochthonous Grenville basement, constituted hyperextended peri-Laurentian continental fragments, analogous to the Rattling Brook allochthon and Dashwoods terrane in Newfoundland ( van Staal et al., 2013 ), that were subducted under the Moretown...
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Journal Article
Journal: Geology
Published: 01 September 2001
Geology (2001) 29 (9): 811–814.
.... 475 Ma). However, adjacent metamorphic rocks, derived from the Laurentian margin and preserved in the Dashwoods subzone, were deformed, overthrust by ophiolites, and intruded by arc plutons by 488 Ma. The adjacent Notre Dame subzone also records isotopic evidence of interaction with the margin by 488...
FIGURES
Image
( a ) Selected tectonic elements of the northern Appalachians. Shaded areas...
Published: 13 April 2006
Fig. 1. ( a ) Selected tectonic elements of the northern Appalachians. Shaded areas correspond to terranes possibly correlative with the Chain Lakes massif. C, Chain Lakes massif; D, Dashwoods subzone ( Waldron and van Staal 2001 ); SF, Shelburne Falls arc ( Karabinos et al. 1998 ). ( b ) Bedrock
Journal Article
Journal: GSA Bulletin
Published: 01 November 2004
GSA Bulletin (2004) 116 (11-12): 1485–1498.
.... In Newfoundland, the exposed lower Paleozoic rocks evolved on opposite sides of the Iapetus Ocean (Fig. 1; Table 1 ). From west to east, the Newfoundland Appalachians consist of the Laurentian Humber zone, the peri-Laurentian Notre Dame and Dashwoods subzones, the peri-Gondwanan Exploits subzone, and the peri...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2006
GSA Bulletin (2006) 118 (3-4): 324–342.
... margin and the Gander, Avalon, and Meguma zones accreted peri-Gondwanan terranes (Fig. 1) . In this classification, the Dunnage zone combines the vestiges of the Cambrian-Ordovician peri-Laurentian (Notre Dame and Dashwoods subzones) and peri-Gondwanan (Exploits subzone) continental and oceanic arc...
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Journal Article
Published: 18 November 2011
Canadian Journal of Earth Sciences (2012) 49 (1): 111–127.
... Ma Annieopsquotch Ophiolite Belt. We present a model in which the Moreton’s Harbour Group formed in response to propagation of the Annieopsquotch Ophiolite Belt spreading centre into the Dashwoods microcontinent. This ridge propagation model supports the formation of the Annieopsquotch Ophiolite Belt...
FIGURES
Journal Article
Published: 21 May 2015
Journal of the Geological Society (2015) 172 (4): 521–532.
... . (2007) and Waldron et al . (2012) presented a model in which the CC–LB oceanic tract formed by sea-floor spreading in an upper plate above an ‘eastward’-dipping subduction zone ( Fig. 2a ) nucleated outboard; that is, to the east of the hypothesized peri-Laurentian ribbon continent (Dashwood...
FIGURES
Journal Article
Journal: Geology
Published: 06 June 2019
Geology (2019) 47 (8): 734–738.
... at a similar crustal level by the end of the Grampian orogeny ( Fig. 4D ). Our tectonic model compares with those for other areas of the Appalachian-Caledonide orogen. For Newfoundland (Canada), Waldron and van Staal (2001) proposed detachment of the Dashwoods terrane from the Laurentian passive margin...
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