Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador
The Snyder breccia is composed of angular to subrounded xenoliths of migmatites and amphibolites in a very fine grained matrix. It is apparently intrusive into the metasediments of the Snyder Group exposed at Snyder Bay, Labrador. The Snyder Group unconformably overlies a migmatitic and amphibolitic...
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Language: | English |
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Canadian Science Publishing
1975
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Online Access: | http://dx.doi.org/10.1139/e75-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-033 |
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crcansciencepubl:10.1139/e75-033 2023-12-17T10:46:38+01:00 Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador Barton Jr., Jackson M. Barton, Erika S. 1975 http://dx.doi.org/10.1139/e75-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-033 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 12, issue 3, page 361-370 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1975 crcansciencepubl https://doi.org/10.1139/e75-033 2023-11-19T13:38:39Z The Snyder breccia is composed of angular to subrounded xenoliths of migmatites and amphibolites in a very fine grained matrix. It is apparently intrusive into the metasediments of the Snyder Group exposed at Snyder Bay, Labrador. The Snyder Group unconformably overlies a migmatitic and amphibolitic basement complex and is intruded by the Kiglapait layered intrusion. K–Ar ages indicate that the basement complex is Archean in age (> 2600 m.y. old) and that the Kiglapait layered intrusion was emplaced prior to 1280 m.y. ago. Major and trace element analyses of the matrix of the Snyder breccia indicate that while it was originally of tonalitic composition, later it locally underwent alteration characterized by loss of sodium and strontium and gain of potassium, rubidium and barium. Rb–Sr isotopic analyses show that this alteration occurred about 1842 m.y. ago, most probably contemporaneously with emplacement of the breccia. The Snyder Group thus was deposited sometime between 2600 and 1842 m.y. ago and may be correlative with other Aphebian successions preserved on the North Atlantic Archean craton. Article in Journal/Newspaper North Atlantic Canadian Science Publishing (via Crossref) Snyder ENVELOPE(-121.386,-121.386,56.917,56.917) Canadian Journal of Earth Sciences 12 3 361 370 |
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 Barton Jr., Jackson M. Barton, Erika S. Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador |
topic_facet |
General Earth and Planetary Sciences |
description |
The Snyder breccia is composed of angular to subrounded xenoliths of migmatites and amphibolites in a very fine grained matrix. It is apparently intrusive into the metasediments of the Snyder Group exposed at Snyder Bay, Labrador. The Snyder Group unconformably overlies a migmatitic and amphibolitic basement complex and is intruded by the Kiglapait layered intrusion. K–Ar ages indicate that the basement complex is Archean in age (> 2600 m.y. old) and that the Kiglapait layered intrusion was emplaced prior to 1280 m.y. ago. Major and trace element analyses of the matrix of the Snyder breccia indicate that while it was originally of tonalitic composition, later it locally underwent alteration characterized by loss of sodium and strontium and gain of potassium, rubidium and barium. Rb–Sr isotopic analyses show that this alteration occurred about 1842 m.y. ago, most probably contemporaneously with emplacement of the breccia. The Snyder Group thus was deposited sometime between 2600 and 1842 m.y. ago and may be correlative with other Aphebian successions preserved on the North Atlantic Archean craton. |
format |
Article in Journal/Newspaper |
author |
Barton Jr., Jackson M. Barton, Erika S. |
author_facet |
Barton Jr., Jackson M. Barton, Erika S. |
author_sort |
Barton Jr., Jackson M. |
title |
Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador |
title_short |
Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador |
title_full |
Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador |
title_fullStr |
Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador |
title_full_unstemmed |
Age and Geochemical Studies of the Snyder Breccia, Coastal Labrador |
title_sort |
age and geochemical studies of the snyder breccia, coastal labrador |
publisher |
Canadian Science Publishing |
publishDate |
1975 |
url |
http://dx.doi.org/10.1139/e75-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-033 |
long_lat |
ENVELOPE(-121.386,-121.386,56.917,56.917) |
geographic |
Snyder |
geographic_facet |
Snyder |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Canadian Journal of Earth Sciences volume 12, issue 3, page 361-370 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e75-033 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
12 |
container_issue |
3 |
container_start_page |
361 |
op_container_end_page |
370 |
_version_ |
1785570192820011008 |