The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?)
The Duxbury massif, Eastmain District, Quebec, is a complex tonalitic intrusion that is internally divisible into a homogeneous border zone of granodiorite (Rb–Sr total-rock isochron age = 2500 ± 85 Ma; initial 87 Sr/ 86 Sr = 0.7023 ± 0.0003) and a heterogeneous core zone of tonalite (Rb–Sr total-ro...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1980
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e80-001 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-001 |
id |
crcansciencepubl:10.1139/e80-001 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e80-001 2023-12-17T10:29:34+01:00 The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) Verpaelst, P. Brooks, C. Franconi, A. 1980 http://dx.doi.org/10.1139/e80-001 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-001 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 17, issue 1, page 1-18 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1980 crcansciencepubl https://doi.org/10.1139/e80-001 2023-11-19T13:38:54Z The Duxbury massif, Eastmain District, Quebec, is a complex tonalitic intrusion that is internally divisible into a homogeneous border zone of granodiorite (Rb–Sr total-rock isochron age = 2500 ± 85 Ma; initial 87 Sr/ 86 Sr = 0.7023 ± 0.0003) and a heterogeneous core zone of tonalite (Rb–Sr total-rock errorchron age = 3060 ± 180 Ma; initial 87 Sr/ 86 Sr = 0.7014 ± 0.0003). The geologic, petrographic, and isotopic data are consistent with a model of remobilization of 3.1 Ga sialic basement during the Kenoran orogeny at 2.5 Ga. Evidence suggests that the source material was of tonalitic composition, that it was never more deeply buried than 15–20 km, and that it was remobilized in a plastic to brittle subsolidus state. Slab-sample studies of the tonalite indicate the 3.1 Ga age is a metamorphic one, and that the source material had a pre-history at that time. Sr-isotope constraints imply source region formation as juvenile material from the mantle at between 3.5 and 3.6 Ga. The Duxbury massif, hence, records a history of crustal development spanning at least 600 Ma and possibly more than 1 Ga. These results may be applicable on a larger scale to many of the regional tonalite massives found in the Superior Province of Canada and elsewhere. Article in Journal/Newspaper Eastmain Canadian Science Publishing (via Crossref) Canada Eastmain ENVELOPE(-78.166,-78.166,52.184,52.184) Canadian Journal of Earth Sciences 17 1 1 18 |
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 Verpaelst, P. Brooks, C. Franconi, A. The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) |
topic_facet |
General Earth and Planetary Sciences |
description |
The Duxbury massif, Eastmain District, Quebec, is a complex tonalitic intrusion that is internally divisible into a homogeneous border zone of granodiorite (Rb–Sr total-rock isochron age = 2500 ± 85 Ma; initial 87 Sr/ 86 Sr = 0.7023 ± 0.0003) and a heterogeneous core zone of tonalite (Rb–Sr total-rock errorchron age = 3060 ± 180 Ma; initial 87 Sr/ 86 Sr = 0.7014 ± 0.0003). The geologic, petrographic, and isotopic data are consistent with a model of remobilization of 3.1 Ga sialic basement during the Kenoran orogeny at 2.5 Ga. Evidence suggests that the source material was of tonalitic composition, that it was never more deeply buried than 15–20 km, and that it was remobilized in a plastic to brittle subsolidus state. Slab-sample studies of the tonalite indicate the 3.1 Ga age is a metamorphic one, and that the source material had a pre-history at that time. Sr-isotope constraints imply source region formation as juvenile material from the mantle at between 3.5 and 3.6 Ga. The Duxbury massif, hence, records a history of crustal development spanning at least 600 Ma and possibly more than 1 Ga. These results may be applicable on a larger scale to many of the regional tonalite massives found in the Superior Province of Canada and elsewhere. |
format |
Article in Journal/Newspaper |
author |
Verpaelst, P. Brooks, C. Franconi, A. |
author_facet |
Verpaelst, P. Brooks, C. Franconi, A. |
author_sort |
Verpaelst, P. |
title |
The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) |
title_short |
The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) |
title_full |
The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) |
title_fullStr |
The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) |
title_full_unstemmed |
The 2.5 Ga Duxbury massif, Quebec : a remobilized piece of pre-3.0 Ga sialic basement(?) |
title_sort |
2.5 ga duxbury massif, quebec : a remobilized piece of pre-3.0 ga sialic basement(?) |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/e80-001 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-001 |
long_lat |
ENVELOPE(-78.166,-78.166,52.184,52.184) |
geographic |
Canada Eastmain |
geographic_facet |
Canada Eastmain |
genre |
Eastmain |
genre_facet |
Eastmain |
op_source |
Canadian Journal of Earth Sciences volume 17, issue 1, page 1-18 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e80-001 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
17 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
18 |
_version_ |
1785581988788305920 |