Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province
The Aillik domain of the Makkovik Province is dominated by deformed and metamorphosed sedimentary and bimodal volcanic rocks of the redefined Aillik Group and abundant unfoliated late- to post-orogenic plutonic rocks. Mapping and petrological studies in the Makkovik Bay area of the Aillik domain sho...
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crcansciencepubl:10.1139/e02-008 2023-12-17T10:33:17+01:00 Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province Sinclair, G S Barr, S M Culshaw, N G Ketchum, J W.F 2002 http://dx.doi.org/10.1139/e02-008 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-008 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 39, issue 5, page 731-748 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2002 crcansciencepubl https://doi.org/10.1139/e02-008 2023-11-19T13:39:14Z The Aillik domain of the Makkovik Province is dominated by deformed and metamorphosed sedimentary and bimodal volcanic rocks of the redefined Aillik Group and abundant unfoliated late- to post-orogenic plutonic rocks. Mapping and petrological studies in the Makkovik Bay area of the Aillik domain showed that the upper part of the group, in addition to felsic volcanic rocks, also includes extensive areas of hypabyssal, foliated granitic rocks (Measles Point Granite). Although petrochemically similar to the spatially associated felsic volcanic rocks, a new UPb (zircon) age of 1929 Ma suggests that the Measles Point Granite may be about 70 million years older than the volcanic rocks of the Aillik Group, based on published UPb dates for the latter unit. The volcanic and granitic rocks show similar structural and metamorphic history, and both have characteristics of crust-derived A-type felsic rocks, although the granite shows less chemical variation than the felsic volcanic rocks. A within-plate setting is postulated, although the associated mafic metavolcanic rocks and amphibolite dykes show evidence of a volcanic-arc influence. Possible solutions of the paradox presented by the UPb ages imply that the Measles Point Granite either represents the juvenile basement to the Aillik Group or was derived from a basement with a large juvenile component. The setting for deposition of the Aillik Group that is consistent with current tectonic models for the Makkovik Province is a rifted arc built on a juvenile terrane accreted to Archean crust. Article in Journal/Newspaper Makkovik Canadian Science Publishing (via Crossref) Makkovik ENVELOPE(-59.178,-59.178,55.087,55.087) Canadian Journal of Earth Sciences 39 5 731 748 |
institution |
Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Sinclair, G S Barr, S M Culshaw, N G Ketchum, J W.F Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province |
topic_facet |
General Earth and Planetary Sciences |
description |
The Aillik domain of the Makkovik Province is dominated by deformed and metamorphosed sedimentary and bimodal volcanic rocks of the redefined Aillik Group and abundant unfoliated late- to post-orogenic plutonic rocks. Mapping and petrological studies in the Makkovik Bay area of the Aillik domain showed that the upper part of the group, in addition to felsic volcanic rocks, also includes extensive areas of hypabyssal, foliated granitic rocks (Measles Point Granite). Although petrochemically similar to the spatially associated felsic volcanic rocks, a new UPb (zircon) age of 1929 Ma suggests that the Measles Point Granite may be about 70 million years older than the volcanic rocks of the Aillik Group, based on published UPb dates for the latter unit. The volcanic and granitic rocks show similar structural and metamorphic history, and both have characteristics of crust-derived A-type felsic rocks, although the granite shows less chemical variation than the felsic volcanic rocks. A within-plate setting is postulated, although the associated mafic metavolcanic rocks and amphibolite dykes show evidence of a volcanic-arc influence. Possible solutions of the paradox presented by the UPb ages imply that the Measles Point Granite either represents the juvenile basement to the Aillik Group or was derived from a basement with a large juvenile component. The setting for deposition of the Aillik Group that is consistent with current tectonic models for the Makkovik Province is a rifted arc built on a juvenile terrane accreted to Archean crust. |
format |
Article in Journal/Newspaper |
author |
Sinclair, G S Barr, S M Culshaw, N G Ketchum, J W.F |
author_facet |
Sinclair, G S Barr, S M Culshaw, N G Ketchum, J W.F |
author_sort |
Sinclair, G S |
title |
Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province |
title_short |
Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province |
title_full |
Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province |
title_fullStr |
Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province |
title_full_unstemmed |
Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province |
title_sort |
geochemistry and age of the aillik group and associated plutonic rocks, makkovik bay area, labrador: implications for tectonic development of the makkovik province |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/e02-008 http://www.nrcresearchpress.com/doi/pdf/10.1139/e02-008 |
long_lat |
ENVELOPE(-59.178,-59.178,55.087,55.087) |
geographic |
Makkovik |
geographic_facet |
Makkovik |
genre |
Makkovik |
genre_facet |
Makkovik |
op_source |
Canadian Journal of Earth Sciences volume 39, issue 5, page 731-748 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e02-008 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
39 |
container_issue |
5 |
container_start_page |
731 |
op_container_end_page |
748 |
_version_ |
1785587227072397312 |