Anorthosite and associated plutons, southern Nain complex, Labrador
Plutonic rocks in a southern area of the Nain anorthosite complex consist of leuconorite, anorthosite, granite, and subordinate diorite. An older anorthosite intrusion (CI < 10) has been invaded and broken up by an extensive leuconorite intrusion (CI = 15). Ferrodiorite occurs as small bodies...
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Canadian Science Publishing
1978
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Online Access: | http://dx.doi.org/10.1139/e78-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-138 |
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crcansciencepubl:10.1139/e78-138 2023-12-17T10:33:32+01:00 Anorthosite and associated plutons, southern Nain complex, Labrador Wiebe, Robert A. 1978 http://dx.doi.org/10.1139/e78-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-138 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 15, issue 8, page 1326-1340 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1978 crcansciencepubl https://doi.org/10.1139/e78-138 2023-11-19T13:39:29Z Plutonic rocks in a southern area of the Nain anorthosite complex consist of leuconorite, anorthosite, granite, and subordinate diorite. An older anorthosite intrusion (CI < 10) has been invaded and broken up by an extensive leuconorite intrusion (CI = 15). Ferrodiorite occurs as small bodies within or adjacent to the leuconorite and is a late stage differentiate of leuconorite, Large granitic plutons of separate crustal origin were emplaced prior to complete solidification of the leuconorite. Where these intrusions invaded leuconorite a marginal hybrid (diorite–granite) zone of heterogeneous matrix developed with chilled pillows of residual magma (mainly ferrodiorite) filter-pressed from the leuconorite. Chilled leuconorite dikes indicate that the parent magma of one leuconorite intrusion was approximately equivalent to its average composition. The older anorthosite body most probably represents a concentration of plagioclase crystals from a different magma; deformation of plagioclase crystals suggest that the mechanism of concentration was filter pressing. Article in Journal/Newspaper Nain Canadian Science Publishing (via Crossref) Nain ENVELOPE(-61.695,-61.695,56.542,56.542) Canadian Journal of Earth Sciences 15 8 1326 1340 |
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 Wiebe, Robert A. Anorthosite and associated plutons, southern Nain complex, Labrador |
topic_facet |
General Earth and Planetary Sciences |
description |
Plutonic rocks in a southern area of the Nain anorthosite complex consist of leuconorite, anorthosite, granite, and subordinate diorite. An older anorthosite intrusion (CI < 10) has been invaded and broken up by an extensive leuconorite intrusion (CI = 15). Ferrodiorite occurs as small bodies within or adjacent to the leuconorite and is a late stage differentiate of leuconorite, Large granitic plutons of separate crustal origin were emplaced prior to complete solidification of the leuconorite. Where these intrusions invaded leuconorite a marginal hybrid (diorite–granite) zone of heterogeneous matrix developed with chilled pillows of residual magma (mainly ferrodiorite) filter-pressed from the leuconorite. Chilled leuconorite dikes indicate that the parent magma of one leuconorite intrusion was approximately equivalent to its average composition. The older anorthosite body most probably represents a concentration of plagioclase crystals from a different magma; deformation of plagioclase crystals suggest that the mechanism of concentration was filter pressing. |
format |
Article in Journal/Newspaper |
author |
Wiebe, Robert A. |
author_facet |
Wiebe, Robert A. |
author_sort |
Wiebe, Robert A. |
title |
Anorthosite and associated plutons, southern Nain complex, Labrador |
title_short |
Anorthosite and associated plutons, southern Nain complex, Labrador |
title_full |
Anorthosite and associated plutons, southern Nain complex, Labrador |
title_fullStr |
Anorthosite and associated plutons, southern Nain complex, Labrador |
title_full_unstemmed |
Anorthosite and associated plutons, southern Nain complex, Labrador |
title_sort |
anorthosite and associated plutons, southern nain complex, labrador |
publisher |
Canadian Science Publishing |
publishDate |
1978 |
url |
http://dx.doi.org/10.1139/e78-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-138 |
long_lat |
ENVELOPE(-61.695,-61.695,56.542,56.542) |
geographic |
Nain |
geographic_facet |
Nain |
genre |
Nain |
genre_facet |
Nain |
op_source |
Canadian Journal of Earth Sciences volume 15, issue 8, page 1326-1340 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e78-138 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
15 |
container_issue |
8 |
container_start_page |
1326 |
op_container_end_page |
1340 |
_version_ |
1785587630692368384 |