Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland
Igneous sheet intrusions are a fundamental component of volcano plumbing systems. Identifying how sheet intrusion emplacement and geometry controls later magmatic processes is critical to understanding the distribution of volcanic eruptions and magma-related ore deposits. Using the Younger Giant Dyk...
Published in: | Geochemistry, Geophysics, Geosystems |
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Language: | English |
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/dyke-architecture-mineral-layering-and-magmatic-convection-new-perspectives-from-the-younger-giant-dyke-complex-s-greenland(a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7).html https://doi.org/10.1029/2021GC010260 https://research-repository.st-andrews.ac.uk/bitstream/10023/24978/1/Koopmans_2022_GGG_Dyke_architecture_mineral_layering_magmatic_convection_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7 2024-06-23T07:53:17+00:00 Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland Koopmans, L. McCarthy, W. Magee, C. 2022-03-01 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/dyke-architecture-mineral-layering-and-magmatic-convection-new-perspectives-from-the-younger-giant-dyke-complex-s-greenland(a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7).html https://doi.org/10.1029/2021GC010260 https://research-repository.st-andrews.ac.uk/bitstream/10023/24978/1/Koopmans_2022_GGG_Dyke_architecture_mineral_layering_magmatic_convection_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/dyke-architecture-mineral-layering-and-magmatic-convection-new-perspectives-from-the-younger-giant-dyke-complex-s-greenland(a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7).html info:eu-repo/semantics/openAccess Koopmans , L , McCarthy , W & Magee , C 2022 , ' Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland ' , Geochemistry, Geophysics, Geosystems , vol. 23 , no. 3 , e2021GC010260 . https://doi.org/10.1029/2021GC010260 Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation article 2022 ftunstandrewcris https://doi.org/10.1029/2021GC010260 2024-06-13T01:20:25Z Igneous sheet intrusions are a fundamental component of volcano plumbing systems. Identifying how sheet intrusion emplacement and geometry controls later magmatic processes is critical to understanding the distribution of volcanic eruptions and magma-related ore deposits. Using the Younger Giant Dyke Complex, a Mesoproterozoic suite of large (< 800 m wide) mafic dykes in southern Greenland, we assess the influence sheet of emplacement and geometry on subsequent magma flow and mush evolution. Through structural mapping, petrographic observations, and anisotropy of magnetic susceptibility fabric analyses, we show that the Younger Giant Dyke Complex was emplaced as a series of individual dyke segments, which following coalescence into a sheet intrusion remained largely isolated during their magmatic evolution. Through petrographic evidence for liquid-rich growth of cumulus phases, concentric magnetic fabrics, and the detailed study layered zones within the Younger Giant Dyke Complex, we infer magma convection occurred within the cores of each dyke element. We particularly relate layering to hydrodynamic sorting processes at a magma-mush boundary towards the base of each convection cell. Overall, our work demonstrates that the initial geometry of sheet intrusions can constrain magma flow patterns and affect the distribution of crystallisation regimes. Article in Journal/Newspaper Greenland University of St Andrews: Research Portal Greenland Geochemistry, Geophysics, Geosystems 23 3 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation |
spellingShingle |
Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation Koopmans, L. McCarthy, W. Magee, C. Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland |
topic_facet |
Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation |
description |
Igneous sheet intrusions are a fundamental component of volcano plumbing systems. Identifying how sheet intrusion emplacement and geometry controls later magmatic processes is critical to understanding the distribution of volcanic eruptions and magma-related ore deposits. Using the Younger Giant Dyke Complex, a Mesoproterozoic suite of large (< 800 m wide) mafic dykes in southern Greenland, we assess the influence sheet of emplacement and geometry on subsequent magma flow and mush evolution. Through structural mapping, petrographic observations, and anisotropy of magnetic susceptibility fabric analyses, we show that the Younger Giant Dyke Complex was emplaced as a series of individual dyke segments, which following coalescence into a sheet intrusion remained largely isolated during their magmatic evolution. Through petrographic evidence for liquid-rich growth of cumulus phases, concentric magnetic fabrics, and the detailed study layered zones within the Younger Giant Dyke Complex, we infer magma convection occurred within the cores of each dyke element. We particularly relate layering to hydrodynamic sorting processes at a magma-mush boundary towards the base of each convection cell. Overall, our work demonstrates that the initial geometry of sheet intrusions can constrain magma flow patterns and affect the distribution of crystallisation regimes. |
format |
Article in Journal/Newspaper |
author |
Koopmans, L. McCarthy, W. Magee, C. |
author_facet |
Koopmans, L. McCarthy, W. Magee, C. |
author_sort |
Koopmans, L. |
title |
Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland |
title_short |
Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland |
title_full |
Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland |
title_fullStr |
Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland |
title_full_unstemmed |
Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland |
title_sort |
dyke architecture, mineral layering, and magmatic convection; new perspectives from the younger giant dyke complex, s greenland |
publishDate |
2022 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/dyke-architecture-mineral-layering-and-magmatic-convection-new-perspectives-from-the-younger-giant-dyke-complex-s-greenland(a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7).html https://doi.org/10.1029/2021GC010260 https://research-repository.st-andrews.ac.uk/bitstream/10023/24978/1/Koopmans_2022_GGG_Dyke_architecture_mineral_layering_magmatic_convection_CC.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Koopmans , L , McCarthy , W & Magee , C 2022 , ' Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland ' , Geochemistry, Geophysics, Geosystems , vol. 23 , no. 3 , e2021GC010260 . https://doi.org/10.1029/2021GC010260 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/dyke-architecture-mineral-layering-and-magmatic-convection-new-perspectives-from-the-younger-giant-dyke-complex-s-greenland(a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2021GC010260 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
23 |
container_issue |
3 |
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1802644868467523584 |