Lyell Collection
Journal of the Geological Society
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via ISI Web of Science (6)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Valverde-Vaquero, P.
Right arrow Articles by Dunning, G. R.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 2006; v. 163; issue.2; p. 347-362;
DOI: 10.1144/0016-764904-130
© 2006 Geological Society of London

Original Article

Mid–Late Ordovician magmatism and metamorphism along the Gander margin in central Newfoundland

Pablo Valverde-Vaquero1,2, Cees R. van Staal1, Vicki McNicoll1 & Greg R. Dunning3

1 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A 0E8, Canada (e-mail: pvalverd@NRCan.gc.ca)
2 2Present address: Instituto Geológico y Minero de España, La Calera 1, Tres Cantos, Madrid, Spain
3 3Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada

Fieldwork coupled with U–Pb dating has clarified the relationships between the Exploits and Gander-derived rocks in central Newfoundland during the Mid-Ordovician opening of the Exploits back-arc basin, reinforcing correlation across the peri-Gondwanan segments of the Appalachian–Caledonian orogen. We have separated a new back-arc-related unit, the Red Cross Group, from the arc-related Victoria Lake Supergroup. This group includes 466 ± 3 Ma felsic volcanic rock interlayered with alkali basalt–enriched mid-ocean ridge basalt, 457 ± 6 Ma gabbro, Llanvirn–Caradoc normal mid-ocean ridge basalt–island arc tholeite, limestone, black shale and mélange. Locally the Red Cross Group is in parautochthonous contact with low-grade Gander psammite. This contact was overrun by the Meelpaeg Metamorphic Nappe during the Devonian. The nappe contains Gander metapsammite (Meelpaeg Subzone) and the coticule-bearing Howley Waters Complex (Exploits), which hosts 467 ± 3 Ma felsic porphyry. The Gander and Exploits metasediments in the nappe are stitched by Arenig–Llanvirn granite (467 ± 6 Ma and 468 +3.5/–3 Ma) and Caradoc intrusions (458 ± 3 Ma and 454 ± 2 Ma). Metamorphic monazite (462 ± 1 Ma) and titanite (460 ± 3 Ma) from the nearby Mount Cormack Subzone (Gander) indicate the coeval formation of a low-pressure–high-temperature metamorphic dome. The widespread presence of Caradoc magmatism suggests that the width of the back-arc basin remained relatively narrow.





This article has been cited by other articles:


Home page
 Geological Society of America BulletinHome page
C.R. van Staal, K.L. Currie, G. Rowbotham, N. Rogers, and W. Goodfellow
Pressure-temperature paths and exhumation of Late Ordovician-Early Silurian blueschists and associated metamorphic nappes of the Salinic Brunswick subduction complex, northern Appalachians
Geological Society of America Bulletin, 2008; 120: 1455 - 1477.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society of America Special PapersHome page
A. Zagorevski, C. R. van Staal, V. McNicoll, N. Rogers, and P. Valverde-Vaquero
Tectonic architecture of an arc-arc collision zone, Newfoundland Appalachians
Geological Society of America Special Papers, 2008; 436: 309 - 333.
[Abstract] [Full Text] [PDF]

Home page
 ajsHome page
A. Zagorevski, C. R. Van Staal, V. McNicoll, and N. Rogers
Upper Cambrian to Upper Ordovician peri-Gondwanan Island arc activity in the Victoria Lake Supergroup, Central Newfoundland: Tectonic development of the northern Ganderian margin
Am J Sci, 2007; 307: 339 - 370.
[Abstract] [Full Text] [PDF]

Home page
 ajsHome page
S. Lin, D. W. Davis, S. M. Barr, C. R. Van Staal, Y. Chen, and M. Constantin
U-Pb Geochronological Constraints On The Evolution Of The ASPY Terrane, Cape Breton Island: Implications For Relationships Between ASPY And BRAS D'OR Terranes And Ganderia In The Canadian Appalachians
Am J Sci, 2007; 307: 371 - 398.
[Abstract] [Full Text] [PDF]

Home page
 ajsHome page
J. C. Pollock, D. H. C. Wilton, C. R. van Staal, and K. D. Morrissey
U-Pb detrital zircon geochronological constraints on the Early Silurian collision of Ganderia and Laurentia along the Dog Bay Line: The terminal Iapetan suture in the Newfoundland Appalachians
Am J Sci, 2007; 307: 399 - 433.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society of America MemoirsHome page
C.R. van Staal, J.B. Whalen, V.J. McNicoll, S. Pehrsson, C.J. Lissenberg, A. Zagorevski, O. van Breemen, and G.A. Jenner
The Notre Dame arc and the Taconic orogeny in Newfoundland
Geological Society of America Memoirs, 2007; 200: 511 - 552.
[Abstract] [Full Text] [PDF]

Home page
 ajsHome page
J. N. Aleinikoff, R. P. Wintsch, R. P. Tollo, D. M. Unruh, C. M. Fanning, and M. D. Schmitz
Ages and origins of rocks of the Killingworth dome, south-central Connecticut: Implications for the tectonic evolution of southern New England
Am J Sci, 2007; 307: 63 - 118.
[Abstract] [Full Text] [PDF]

Home page
 ajsHome page
R. P. Wintsch, J. N. Aleinikoff, G. J. Walsh, W. A. Bothner, A. M. Hussey II, and C. M. Fanning
Shrimp U-Pb evidence for a Late Silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England
Am J Sci, 2007; 307: 119 - 167.
[Abstract] [Full Text] [PDF]