Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland?
The Lush's Bight Group of north-central Newfoundland consists mainly of regionally metamorphosed pillowed basalts. Mafic dikes and sills, comagmatic with the basalts, are abundant and dioritic stocks and silicic igneous rocks constitute a small portion of the group. Most rocks belong to a thole...
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Language: | English |
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Canadian Science Publishing
1972
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Online Access: | http://dx.doi.org/10.1139/e72-046 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-046 |
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crcansciencepubl:10.1139/e72-046 2023-12-17T10:43:57+01:00 Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? Smitheringale, W. G. 1972 http://dx.doi.org/10.1139/e72-046 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-046 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 9, issue 5, page 574-588 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1972 crcansciencepubl https://doi.org/10.1139/e72-046 2023-11-19T13:38:34Z The Lush's Bight Group of north-central Newfoundland consists mainly of regionally metamorphosed pillowed basalts. Mafic dikes and sills, comagmatic with the basalts, are abundant and dioritic stocks and silicic igneous rocks constitute a small portion of the group. Most rocks belong to a tholeiitic suite derived from low-K tholeiite that has a trace element content similar to oceanic tholeiite. A few rocks are slightly alkaline, implying that alkali basalt may have contributed to the volcanic pile. The thickness, chemical composition, and lithology of the group suggest it represents the upper (dominantly volcanic) part of layer two of oceanic crust. Alternatively, formation as a tholeiitic shield beneath a mid-ocean volcanic island is suggested by the alkaline affinities of some rocks and by a thick pyroclastic sequence that conformably overlies the group.The Lush's Bight Group contains many volcanogenic iron-copper sulfide occurrences.Mid-ocean ridges are recognized as magmatically dominated environments in which hydrothermal fluids of plutonic and volcanic origin might constitute ore fluids. Article in Journal/Newspaper Newfoundland Canadian Science Publishing (via Crossref) Canadian Journal of Earth Sciences 9 5 574 588 |
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 Smitheringale, W. G. Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? |
topic_facet |
General Earth and Planetary Sciences |
description |
The Lush's Bight Group of north-central Newfoundland consists mainly of regionally metamorphosed pillowed basalts. Mafic dikes and sills, comagmatic with the basalts, are abundant and dioritic stocks and silicic igneous rocks constitute a small portion of the group. Most rocks belong to a tholeiitic suite derived from low-K tholeiite that has a trace element content similar to oceanic tholeiite. A few rocks are slightly alkaline, implying that alkali basalt may have contributed to the volcanic pile. The thickness, chemical composition, and lithology of the group suggest it represents the upper (dominantly volcanic) part of layer two of oceanic crust. Alternatively, formation as a tholeiitic shield beneath a mid-ocean volcanic island is suggested by the alkaline affinities of some rocks and by a thick pyroclastic sequence that conformably overlies the group.The Lush's Bight Group contains many volcanogenic iron-copper sulfide occurrences.Mid-ocean ridges are recognized as magmatically dominated environments in which hydrothermal fluids of plutonic and volcanic origin might constitute ore fluids. |
format |
Article in Journal/Newspaper |
author |
Smitheringale, W. G. |
author_facet |
Smitheringale, W. G. |
author_sort |
Smitheringale, W. G. |
title |
Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? |
title_short |
Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? |
title_full |
Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? |
title_fullStr |
Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? |
title_full_unstemmed |
Low-Potash Lush's Bight Tholeiites: Ancient Oceanic Crust in Newfoundland? |
title_sort |
low-potash lush's bight tholeiites: ancient oceanic crust in newfoundland? |
publisher |
Canadian Science Publishing |
publishDate |
1972 |
url |
http://dx.doi.org/10.1139/e72-046 http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-046 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 9, issue 5, page 574-588 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e72-046 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
9 |
container_issue |
5 |
container_start_page |
574 |
op_container_end_page |
588 |
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1785560292116135936 |