The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution
The Matachewan Large Igneous Province (LIP) is interpreted to have formed during the early stages of mantle plume-induced continental break-up in the early Proterozoic. When the Matachewan LIP is reconstructed to its original configuration with units from the Superior Craton and other formerly adjac...
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Oxford University Press (OUP)
2015
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Online Access: | http://hdl.handle.net/10379/10793 https://doi.org/10.1093/petrology/egv038 |
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ftnuigalway:oai:aran.library.nuigalway.ie/:10379/10793 2023-06-11T04:11:41+02:00 The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution Ciborowski, T. Jake R. Kerr, Andrew C. Ernst, Richard E. McDonald, Iain Minifie, Matthew J. Harlan, Stephen S. Millar, Ian L. 2015-08-01 http://hdl.handle.net/10379/10793 https://doi.org/10.1093/petrology/egv038 unknown Oxford University Press (OUP) Journal of Petrology Ciborowski, T. Jake R. Kerr, Andrew C.; Ernst, Richard E.; McDonald, Iain; Minifie, Matthew J.; Harlan, Stephen S.; Millar, Ian L. (2015). The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution. Journal of Petrology 56 (8), 1459-1493 0022-3530,1460-2415 http://hdl.handle.net/10379/10793 doi:10.1093/petrology/egv038 Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ geochemistry large igneous province modelling great oxidation event western churchill province u-pb geochronology kapuskasing structural zone northeastern baltic shield ti continental tholeiites layered mafic intrusions radiating dyke swarms fennoscandian shield upper-mantle Article 2015 ftnuigalway https://doi.org/10.1093/petrology/egv038 2023-05-28T18:05:07Z The Matachewan Large Igneous Province (LIP) is interpreted to have formed during the early stages of mantle plume-induced continental break-up in the early Proterozoic. When the Matachewan LIP is reconstructed to its original configuration with units from the Superior Craton and other formerly adjacent blocks (Karelia, Kola, Wyoming and Hearne), the dyke swarms, layered intrusions and flood basalts, emplaced over the lifetime of the province, form one of the most extensive magmatic provinces recognized in the geological record. New geochemical data allow, for the first time, the Matachewan LIP to be considered as a single, coherent entity and show that Matachewan LIP rocks share a common tholeiitic composition and trace element geochemistry, characterized by enrichment in the most incompatible elements and depletion in the less incompatible elements. This signature, ubiquitous in early Proterozoic continental magmatic rocks, may indicate that the Matachewan LIP formed through contamination of the primary magmas with litho-spheric material or that the early Proterozoic mantle had a fundamentally different composition from the modern mantle. In addition to the radiating geometry of the dyke swarms, a plume origin for the Matachewan LIP is consistent with the geochemistry of some of the suites; these suites are used to constrain a source mantle potential temperature of c. 1500-1550 degrees C. Comparison of these mantle potential temperatures with estimated temperatures for the early Proterozoic upper mantle indicates that they are consistent with a hot mantle plume source for the magmatism. Geochemical data from coeval intrusions suggest that the plume head was compositionally heterogeneous and sampled material from both depleted and enriched mantle. As has been documented with less ancient but similarly vast LIPs, the emplacement of the Matachewan LIP probably had a significant impact on the early Proterozoic global environment. Compilation of the best age estimates for various suites shows that the emplacement of ... Article in Journal/Newspaper Fennoscandian National University of Ireland (NUI), Galway: ARAN Journal of Petrology 56 8 1459 1494 |
institution |
Open Polar |
collection |
National University of Ireland (NUI), Galway: ARAN |
op_collection_id |
ftnuigalway |
language |
unknown |
topic |
geochemistry large igneous province modelling great oxidation event western churchill province u-pb geochronology kapuskasing structural zone northeastern baltic shield ti continental tholeiites layered mafic intrusions radiating dyke swarms fennoscandian shield upper-mantle |
spellingShingle |
geochemistry large igneous province modelling great oxidation event western churchill province u-pb geochronology kapuskasing structural zone northeastern baltic shield ti continental tholeiites layered mafic intrusions radiating dyke swarms fennoscandian shield upper-mantle Ciborowski, T. Jake R. Kerr, Andrew C. Ernst, Richard E. McDonald, Iain Minifie, Matthew J. Harlan, Stephen S. Millar, Ian L. The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
topic_facet |
geochemistry large igneous province modelling great oxidation event western churchill province u-pb geochronology kapuskasing structural zone northeastern baltic shield ti continental tholeiites layered mafic intrusions radiating dyke swarms fennoscandian shield upper-mantle |
description |
The Matachewan Large Igneous Province (LIP) is interpreted to have formed during the early stages of mantle plume-induced continental break-up in the early Proterozoic. When the Matachewan LIP is reconstructed to its original configuration with units from the Superior Craton and other formerly adjacent blocks (Karelia, Kola, Wyoming and Hearne), the dyke swarms, layered intrusions and flood basalts, emplaced over the lifetime of the province, form one of the most extensive magmatic provinces recognized in the geological record. New geochemical data allow, for the first time, the Matachewan LIP to be considered as a single, coherent entity and show that Matachewan LIP rocks share a common tholeiitic composition and trace element geochemistry, characterized by enrichment in the most incompatible elements and depletion in the less incompatible elements. This signature, ubiquitous in early Proterozoic continental magmatic rocks, may indicate that the Matachewan LIP formed through contamination of the primary magmas with litho-spheric material or that the early Proterozoic mantle had a fundamentally different composition from the modern mantle. In addition to the radiating geometry of the dyke swarms, a plume origin for the Matachewan LIP is consistent with the geochemistry of some of the suites; these suites are used to constrain a source mantle potential temperature of c. 1500-1550 degrees C. Comparison of these mantle potential temperatures with estimated temperatures for the early Proterozoic upper mantle indicates that they are consistent with a hot mantle plume source for the magmatism. Geochemical data from coeval intrusions suggest that the plume head was compositionally heterogeneous and sampled material from both depleted and enriched mantle. As has been documented with less ancient but similarly vast LIPs, the emplacement of the Matachewan LIP probably had a significant impact on the early Proterozoic global environment. Compilation of the best age estimates for various suites shows that the emplacement of ... |
format |
Article in Journal/Newspaper |
author |
Ciborowski, T. Jake R. Kerr, Andrew C. Ernst, Richard E. McDonald, Iain Minifie, Matthew J. Harlan, Stephen S. Millar, Ian L. |
author_facet |
Ciborowski, T. Jake R. Kerr, Andrew C. Ernst, Richard E. McDonald, Iain Minifie, Matthew J. Harlan, Stephen S. Millar, Ian L. |
author_sort |
Ciborowski, T. Jake R. |
title |
The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
title_short |
The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
title_full |
The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
title_fullStr |
The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
title_full_unstemmed |
The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
title_sort |
early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution |
publisher |
Oxford University Press (OUP) |
publishDate |
2015 |
url |
http://hdl.handle.net/10379/10793 https://doi.org/10.1093/petrology/egv038 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
Journal of Petrology Ciborowski, T. Jake R. Kerr, Andrew C.; Ernst, Richard E.; McDonald, Iain; Minifie, Matthew J.; Harlan, Stephen S.; Millar, Ian L. (2015). The early proterozoic matachewan large igneous province: geochemistry, petrogenesis, and implications for earth evolution. Journal of Petrology 56 (8), 1459-1493 0022-3530,1460-2415 http://hdl.handle.net/10379/10793 doi:10.1093/petrology/egv038 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
op_doi |
https://doi.org/10.1093/petrology/egv038 |
container_title |
Journal of Petrology |
container_volume |
56 |
container_issue |
8 |
container_start_page |
1459 |
op_container_end_page |
1494 |
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1768386908742746112 |