The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance
A diabase dike about 140 km long (the Shelburne dike) cuts in a northeasterly direction across the southwestern part of Nova Scotia. The dike, recently dated at 201 Ma, forms part of a major Appalachian system of diabase dikes and basaltic flows of early Mesozoic age, emplaced during the first stage...
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Canadian Science Publishing
1981
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crcansciencepubl:10.1139/e81-124 2024-09-15T18:20:06+00:00 The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance Papezik, V. S. Barr, Sandra M. 1981 http://dx.doi.org/10.1139/e81-124 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-124 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 18, issue 8, page 1346-1355 ISSN 0008-4077 1480-3313 journal-article 1981 crcansciencepubl https://doi.org/10.1139/e81-124 2024-07-25T04:10:07Z A diabase dike about 140 km long (the Shelburne dike) cuts in a northeasterly direction across the southwestern part of Nova Scotia. The dike, recently dated at 201 Ma, forms part of a major Appalachian system of diabase dikes and basaltic flows of early Mesozoic age, emplaced during the first stages of opening of the present Atlantic Ocean.The Shelburne dike is tholeiitic and quartz normative. Its chemistry resembles that of the Palisade sill of New Jersey, but differs substantially from the more primitive magnesian composition of a similar dike on the Avalon Peninsula of Newfoundland. A more advanced stage of differentiation is reflected also in the composition of its main minerals (augite, pigeonite, zoned orthopyroxene, calcic plagioclase). Such chemical variations among the roughly contemporaneous diabase dikes of the northern Appalachians complicate the existing petrogenetic and tectonic models of the development of the Appalachian dike swarm. Article in Journal/Newspaper Newfoundland Canadian Science Publishing Canadian Journal of Earth Sciences 18 8 1346 1355 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
A diabase dike about 140 km long (the Shelburne dike) cuts in a northeasterly direction across the southwestern part of Nova Scotia. The dike, recently dated at 201 Ma, forms part of a major Appalachian system of diabase dikes and basaltic flows of early Mesozoic age, emplaced during the first stages of opening of the present Atlantic Ocean.The Shelburne dike is tholeiitic and quartz normative. Its chemistry resembles that of the Palisade sill of New Jersey, but differs substantially from the more primitive magnesian composition of a similar dike on the Avalon Peninsula of Newfoundland. A more advanced stage of differentiation is reflected also in the composition of its main minerals (augite, pigeonite, zoned orthopyroxene, calcic plagioclase). Such chemical variations among the roughly contemporaneous diabase dikes of the northern Appalachians complicate the existing petrogenetic and tectonic models of the development of the Appalachian dike swarm. |
format |
Article in Journal/Newspaper |
author |
Papezik, V. S. Barr, Sandra M. |
spellingShingle |
Papezik, V. S. Barr, Sandra M. The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance |
author_facet |
Papezik, V. S. Barr, Sandra M. |
author_sort |
Papezik, V. S. |
title |
The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance |
title_short |
The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance |
title_full |
The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance |
title_fullStr |
The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance |
title_full_unstemmed |
The Shelburne dike, an early Mesozoic diabase dike in Nova Scotia: mineralogy, chemistry, and regional significance |
title_sort |
shelburne dike, an early mesozoic diabase dike in nova scotia: mineralogy, chemistry, and regional significance |
publisher |
Canadian Science Publishing |
publishDate |
1981 |
url |
http://dx.doi.org/10.1139/e81-124 http://www.nrcresearchpress.com/doi/pdf/10.1139/e81-124 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Earth Sciences volume 18, issue 8, page 1346-1355 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e81-124 |
container_title |
Canadian Journal of Earth Sciences |
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18 |
container_issue |
8 |
container_start_page |
1346 |
op_container_end_page |
1355 |
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1810458467328065536 |