The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland
The Twillingate Granite cuts mafic pillow lavas and silicic fragmental volcanic rocks of the Sleepy Cove Group. The granitic rocks are soda-rich and they vary from intensely foliated and mylonitic in the south to mildly foliated and massive toward the north. The Sleepy Cove volcanic rocks show simil...
Published in: | Canadian Journal of Earth Sciences |
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Canadian Science Publishing
1975
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crcansciencepubl:10.1139/e75-090 2023-12-17T10:43:37+01:00 The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland Williams, Harold Payne, John G. 1975 http://dx.doi.org/10.1139/e75-090 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-090 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 12, issue 6, page 982-995 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1975 crcansciencepubl https://doi.org/10.1139/e75-090 2023-11-19T13:38:55Z The Twillingate Granite cuts mafic pillow lavas and silicic fragmental volcanic rocks of the Sleepy Cove Group. The granitic rocks are soda-rich and they vary from intensely foliated and mylonitic in the south to mildly foliated and massive toward the north. The Sleepy Cove volcanic rocks show similar structural and metamorphic variations from lineated amphibolitic pillow lavas, to elongated pillows of greenschist metamorphic grade, to slightly metamorphosed and relatively undeformed pillow lavas.The collective terrane occupied by the Twillingate Granite and Sleepy Cove Group is virtually surrounded by intrusive mafic dikes that are integral and coeval parts of the Moretons Harbour and Herring Neck Groups. The dikes decrease in abundance away from the contacts of the collective Twillingate – Sleepy Cove terrane. The essentially intrusive contact is modified by faults and locally, the profuse dike swarms are absent.Regional relationships, thickness, lithofacies, and petrochemistry all indicate that the Moretons Harbour and Herring Neck Groups relate to an episode of Lower Ordovician island arc volcanism. Intrusive relationships and contrasts in structural style and metamorphic grade indicate that the Twillingate Granite and Sleepy Cove Group are older. These older rocks are also interpreted as island arc derivatives, so that in their present position, they may represent the remnant of a partly deformed and metamorphosed older arc that is now bordered by relatively undeformed Lower Ordovician volcanic rocks.Similar relationships within transported sequences of western Newfoundland suggest a central Newfoundland island arc provenance for the transported Little Port Complex. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Twillingate ENVELOPE(-54.765,-54.765,49.650,49.650) Herring Neck ENVELOPE(-54.615,-54.615,49.633,49.633) Sleepy Cove ENVELOPE(-54.815,-54.815,49.683,49.683) Canadian Journal of Earth Sciences 12 6 982 995 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Williams, Harold Payne, John G. The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland |
topic_facet |
General Earth and Planetary Sciences |
description |
The Twillingate Granite cuts mafic pillow lavas and silicic fragmental volcanic rocks of the Sleepy Cove Group. The granitic rocks are soda-rich and they vary from intensely foliated and mylonitic in the south to mildly foliated and massive toward the north. The Sleepy Cove volcanic rocks show similar structural and metamorphic variations from lineated amphibolitic pillow lavas, to elongated pillows of greenschist metamorphic grade, to slightly metamorphosed and relatively undeformed pillow lavas.The collective terrane occupied by the Twillingate Granite and Sleepy Cove Group is virtually surrounded by intrusive mafic dikes that are integral and coeval parts of the Moretons Harbour and Herring Neck Groups. The dikes decrease in abundance away from the contacts of the collective Twillingate – Sleepy Cove terrane. The essentially intrusive contact is modified by faults and locally, the profuse dike swarms are absent.Regional relationships, thickness, lithofacies, and petrochemistry all indicate that the Moretons Harbour and Herring Neck Groups relate to an episode of Lower Ordovician island arc volcanism. Intrusive relationships and contrasts in structural style and metamorphic grade indicate that the Twillingate Granite and Sleepy Cove Group are older. These older rocks are also interpreted as island arc derivatives, so that in their present position, they may represent the remnant of a partly deformed and metamorphosed older arc that is now bordered by relatively undeformed Lower Ordovician volcanic rocks.Similar relationships within transported sequences of western Newfoundland suggest a central Newfoundland island arc provenance for the transported Little Port Complex. |
format |
Article in Journal/Newspaper |
author |
Williams, Harold Payne, John G. |
author_facet |
Williams, Harold Payne, John G. |
author_sort |
Williams, Harold |
title |
The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland |
title_short |
The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland |
title_full |
The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland |
title_fullStr |
The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland |
title_full_unstemmed |
The Twillingate Granite and nearby Volcanic Groups: An Island Arc Complex In Northeast Newfoundland |
title_sort |
twillingate granite and nearby volcanic groups: an island arc complex in northeast newfoundland |
publisher |
Canadian Science Publishing |
publishDate |
1975 |
url |
http://dx.doi.org/10.1139/e75-090 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-090 |
long_lat |
ENVELOPE(-54.765,-54.765,49.650,49.650) ENVELOPE(-54.615,-54.615,49.633,49.633) ENVELOPE(-54.815,-54.815,49.683,49.683) |
geographic |
Twillingate Herring Neck Sleepy Cove |
geographic_facet |
Twillingate Herring Neck Sleepy Cove |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 12, issue 6, page 982-995 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e75-090 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
12 |
container_issue |
6 |
container_start_page |
982 |
op_container_end_page |
995 |
_version_ |
1785558780744826880 |