Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland
The expedition was funded by the Mining Institute of Scotland Trust, the Institute of Materials, Minerals and Mining, the Society of Economic Geologists Hickok-Radford Fund, the Edinburgh Geological Society, the Augustine Courtauld trust and the Scott Polar Research Institute. Igneous sheet intrusio...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | http://hdl.handle.net/10023/24978 https://doi.org/10.1029/2021GC010260 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/24978 2023-07-02T03:32:25+02:00 Dyke architecture, mineral layering, and magmatic convection; new perspectives from the Younger Giant Dyke Complex, S Greenland Koopmans, L. McCarthy, W. Magee, C. University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry 2022-03-02T11:30:26Z 22 application/pdf http://hdl.handle.net/10023/24978 https://doi.org/10.1029/2021GC010260 eng eng Geochemistry, Geophysics, Geosystems 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 1525-2027 PURE: 278023854 PURE UUID: a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7 RIS: urn:6C71E4783CCD0063FA5A833C000D62C1 ORCID: /0000-0002-7214-1449/work/109316248 WOS: 000776516500018 Scopus: 85127230183 http://hdl.handle.net/10023/24978 https://doi.org/10.1029/2021GC010260 Copyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation QE Geology DAS MCC QE Journal article 2022 ftstandrewserep https://doi.org/10.1029/2021GC010260 2023-06-13T18:29:05Z The expedition was funded by the Mining Institute of Scotland Trust, the Institute of Materials, Minerals and Mining, the Society of Economic Geologists Hickok-Radford Fund, the Edinburgh Geological Society, the Augustine Courtauld trust and the Scott Polar Research Institute. 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. Publisher PDF Peer reviewed Article in Journal/Newspaper Greenland Scott Polar Research Institute University of St Andrews: Digital Research Repository Courtauld ENVELOPE(-67.508,-67.508,-70.330,-70.330) Greenland Geochemistry, Geophysics, Geosystems 23 3 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation QE Geology DAS MCC QE |
spellingShingle |
Anisotropy of magnetic susceptibility Layered igneous systems Rock magnetics Magma chamber processes Mesoproterozoic Sheet segmentation QE Geology DAS MCC QE 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 QE Geology DAS MCC QE |
description |
The expedition was funded by the Mining Institute of Scotland Trust, the Institute of Materials, Minerals and Mining, the Society of Economic Geologists Hickok-Radford Fund, the Edinburgh Geological Society, the Augustine Courtauld trust and the Scott Polar Research Institute. 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. Publisher PDF Peer reviewed |
author2 |
University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry |
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 |
http://hdl.handle.net/10023/24978 https://doi.org/10.1029/2021GC010260 |
long_lat |
ENVELOPE(-67.508,-67.508,-70.330,-70.330) |
geographic |
Courtauld Greenland |
geographic_facet |
Courtauld Greenland |
genre |
Greenland Scott Polar Research Institute |
genre_facet |
Greenland Scott Polar Research Institute |
op_relation |
Geochemistry, Geophysics, Geosystems 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 1525-2027 PURE: 278023854 PURE UUID: a32ca3eb-4e14-4c99-bc5a-4a5e94f198d7 RIS: urn:6C71E4783CCD0063FA5A833C000D62C1 ORCID: /0000-0002-7214-1449/work/109316248 WOS: 000776516500018 Scopus: 85127230183 http://hdl.handle.net/10023/24978 https://doi.org/10.1029/2021GC010260 |
op_rights |
Copyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
op_doi |
https://doi.org/10.1029/2021GC010260 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
23 |
container_issue |
3 |
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1770272001251868672 |