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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
... ABSTRACT Synthesis of the Ordovician Taconic orogeny in the northern Appalachians has been hindered by along-strike variations in Laurentian, Gondwanan, and arc-generated tectonic elements. The Dashwoods terrane in Newfoundland has been interpreted as a peri-Laurentian arc terrane that collided...
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Series: GSA Special Papers
Published: 19 May 2022
DOI: 10.1130/2022.2554(09)
EISBN: 9780813795546
... ABSTRACT The Baie Verte Line in western Newfoundland marks a suture zone between (1) an upper plate represented by suprasubduction zone oceanic crust (Baie Verte oceanic tract) and the trailing continental Notre Dame arc, with related upper-plate rocks built upon the Dashwoods terrane; and (2...
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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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Paleogeographic map of late Hirnantian–early Rhuddanian times showing positions of the Condroz Inlier and other terranes across the Iapetus Ocean. Paleoreconstruction based on Liljeroth et al. (2017) and Torsvik and Cocks (2016). Note that a modified version of the Gall's projection 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; MV, Midland Valley Terrane; Nova Sc, Nova Scotia; Österg. Östergötland; PANTHA. PANTHALASSIC; RIL, Red Indian Line; S. Mayo, South Mayo Terrane; Shrop, Shropshire; SU, Southern Uplands Terrane; TH, Table Head (west Newfoundland, foreland basin); S Wales, South Wales; W. Avalonia, West Avalonia.
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
Series: Geological Society, London, Special Publications
Published: 22 April 2024
DOI: 10.1144/SP542-2023-20
EISBN: 9781786206398
... isotopic signatures relative to the more juvenile peri-Gondwanan terranes to the east (e.g. Zagorevski et al. 2008 ). Hodgin et al. (2022) investigated the provenance of paragneiss in the southern part of Dashwoods. This area is underlain by a variety of deformed pre-to syn-tectonic intermediate...
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(A) Simplified geology of southwestern Newfoundland modified from van Staal et al. (1996a, 1996b). Ages and metamorphic zones compiled from Dunning et al. (1990), Burgess et al. (1995), Dubé et al. (1996), and Valverde et al. (2000) and those presented herein. The map units are labelled in the right lower corner. The antiform–synform symbols for major F2 and F3 folds are open and solid black, respectively. In addition, the line weight is higher for F3. Some of the units and details shown in cross-sections B and C have been omitted on the map for the sake of clarity but can be seen in the detailed maps of Figs. 5 and 6. Upper Ordovician to Silurian rocks of the Windsor Point Group lie unconformably on the older rocks of the Dashwoods terrane (Dubé et al. 1996). (B) Cross-section (A-A’) through the Grand Bay Complex and Port aux Basques Complex. (C) Cross section (B-B’) through Harbour le Cou Group and eastern part of Port aux Basques Complex. Down plunge projections are interpretive and schematic due to non-cylindricity of F3 folds and unknown structural complexities at depth. Abbreviations are partly given in Fig. 1. BBF, Big Barachois fault; BIBA, Burnt Island Brook anticline; DRD, Dolphin Road dome; GRSZ, Grandys River shear zone; GSA, Grandy Sound antiform; IMDZ, Isle aux Morts deformation zone; IMF, Isle aux Mort Fault; OBF, Otter Bay Fault.
Published: 29 May 2024
but can be seen in the detailed maps of Figs. 5 and 6 . Upper Ordovician to Silurian rocks of the Windsor Point Group lie unconformably on the older rocks of the Dashwoods terrane ( Dubé et al. 1996 ). (B) Cross-section (A-A’) through the Grand Bay Complex and Port aux Basques Complex. (C) Cross
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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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: Geological Society, London, Special Publications
Published: 04 October 2023
DOI: 10.1144/SP531-2022-152
EISBN: 9781786209634
..., Ballantrae ophiolite; BVBL, Baie Verte Brompton Line; BVOT, Baie Verte oceanic tract; CC, Coastal and Little Port Complex; CHC, Coney Head Complex; Co, Connemara including South Connemara Group; Dash, Dashwoods terrane; Dp, Deer Park ophiolite; FCL, Fairhead Clew Bay Line; GGF, Great Glen Fault; Gra...
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 Figure 10. Schematic paleogeographic reconstructions at (A) 600 Ma; (B) 570 Ma; (C) 550 Ma; (D) 530 Ma. Abbreviations: AM— Amazonia, ANT—Antarctica, AUS—Australia, AV—Avalon, BA—Baltica, C-SF—Congo−São Francisco, IND—India, K—Kalahari, LAUR—Laurentia, RP—Rio de la Plata, SIB—Siberia, WA—West Africa. The long linear crustal block (pink) along the east Laurentian margin represents the proposed terrane(s) that rifted from Laurentia prior to its passive Iapetan margin development. The block(s) possibly included the Argentine Precordillera (Astini et al., 1995), the Oaxacan terrane (Keppie 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 Precordillera proposed by Thomas and Astini (1996) and Dalziel (1997)
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
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...
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Delimitation of rift-related magmatic pulses at 750–680 Ma (purple) and 615–550 Ma (red) in Laurentia (LA), Amazonia (AM), and Baltica (BA). See Figure S1 (see footnote 1) for a detailed compilation of magmatic events. Reconstruction of Rodinia is slightly modified from Li et al. (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—Sierra Madre; M—Mixteca Oaxaca.
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
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(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 geologic map of the Chain Lakes massif and surrounding area. Heavy lines mark faults. Stars and labels refer to geochronologic sample locations. (c) Bedrock map showing relationships between the Boil Mountain Complex, Jim Pond Formation, and Chain Lakes massif. After Albee and Boudette (1972), Goldsmith (1985), Osberg et al. (1985), Boudette (1991), Moench et al. (1995).
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: 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...
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Journal Article
Journal: Geology
Published: 01 June 2014
Geology (2014) 42 (6): 539–542.
... to the boundary between the two as the Red Indian Line ( Fig. 1 ), which is interpreted as the main Iapetan suture. To the west of the Red Indian Line, the Notre Dame subzone consists of hyperextended Laurentian crustal fragments, such as the Rattling Brook allochthon and Dashwoods terrane ( van Staal et al...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2004
GSA Bulletin (2004) 116 (11-12): 1485–1498.
... 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-Gondwanan Gander and Avalon zones ( Williams, 1979 , 1995 ; Williams et al...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2006
GSA Bulletin (2006) 118 (3-4): 324–342.
...-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-backarc and ophiolitic complexes that formed within the Iapetus Ocean...
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Journal Article
Published: 18 November 2011
Canadian Journal of Earth Sciences (2012) 49 (1): 111–127.
... a model whereby the Annieopsquotch Ophiolite Belt spreading centre propagated into the Dashwoods terrane, forming the Moreton’s Harbour Group. ...
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