Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland
The peralkaline to agpaitic Ilímaussaq Complex, S. Greenland, displays spectacular macrorhythmic (> 5 m) layering via the kakortokite (agpaitic nepheline syenite), which outcrops as the lowest exposed rocks in the complex. This study applies crystal size distribution (CSD) analyses and eudialyte-...
Published in: | Lithos |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/layering-in-peralkaline-magmas-ilimaussaq-complex-s-greenland(f59e3d75-2fe8-4928-b800-26bd924c28e3).html https://doi.org/10.1016/j.lithos.2016.10.023 https://research-repository.st-andrews.ac.uk/bitstream/10023/9817/1/Hunt_et_al_2017_Ilimaussaq_layering.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/f59e3d75-2fe8-4928-b800-26bd924c28e3 2024-06-23T07:53:17+00:00 Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland Hunt, Emma J. Finch, Adrian A. Donaldson, Colin H. 2017-01 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/layering-in-peralkaline-magmas-ilimaussaq-complex-s-greenland(f59e3d75-2fe8-4928-b800-26bd924c28e3).html https://doi.org/10.1016/j.lithos.2016.10.023 https://research-repository.st-andrews.ac.uk/bitstream/10023/9817/1/Hunt_et_al_2017_Ilimaussaq_layering.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/layering-in-peralkaline-magmas-ilimaussaq-complex-s-greenland(f59e3d75-2fe8-4928-b800-26bd924c28e3).html info:eu-repo/semantics/openAccess Hunt , E J , Finch , A A & Donaldson , C H 2017 , ' Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland ' , Lithos , vol. 268-271 , pp. 1-15 . https://doi.org/10.1016/j.lithos.2016.10.023 Ilímaussaq Complex Kakortokite Agpaitic Macrorhythmic layering Crystal size distribution Eudialyte-group minerals article 2017 ftunstandrewcris https://doi.org/10.1016/j.lithos.2016.10.023 2024-06-13T00:54:30Z The peralkaline to agpaitic Ilímaussaq Complex, S. Greenland, displays spectacular macrorhythmic (> 5 m) layering via the kakortokite (agpaitic nepheline syenite), which outcrops as the lowest exposed rocks in the complex. This study applies crystal size distribution (CSD) analyses and eudialyte-group mineral chemical compositions to study the marker horizon, Unit 0, and the contact to the underlying Unit − 1. Unit 0 is the best-developed unit in the kakortokites and as such is ideal for gaining insight into processes of crystal formation and growth within the layered kakortokite. The findings are consistent with a model whereby the bulk of the black and red layers developed through in situ crystallisation at the crystal mush–magma interface, whereas the white layer developed through a range of processes operating throughout the magma chamber, including density segregation (gravitational settling and flotation). Primary textures were modified through late-stage textural coarsening via grain overgrowth. An open-system model is proposed, where varying concentrations of halogens, in combination with undercooling, controlled crystal nucleation and growth to form Unit 0. Our observations suggest that the model is applicable more widely to the layering throughout the kakortokite series and potentially other layered peralkaline/agpaitic rocks around the world. Article in Journal/Newspaper Greenland University of St Andrews: Research Portal Greenland Lithos 268-271 1 15 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Ilímaussaq Complex Kakortokite Agpaitic Macrorhythmic layering Crystal size distribution Eudialyte-group minerals |
spellingShingle |
Ilímaussaq Complex Kakortokite Agpaitic Macrorhythmic layering Crystal size distribution Eudialyte-group minerals Hunt, Emma J. Finch, Adrian A. Donaldson, Colin H. Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland |
topic_facet |
Ilímaussaq Complex Kakortokite Agpaitic Macrorhythmic layering Crystal size distribution Eudialyte-group minerals |
description |
The peralkaline to agpaitic Ilímaussaq Complex, S. Greenland, displays spectacular macrorhythmic (> 5 m) layering via the kakortokite (agpaitic nepheline syenite), which outcrops as the lowest exposed rocks in the complex. This study applies crystal size distribution (CSD) analyses and eudialyte-group mineral chemical compositions to study the marker horizon, Unit 0, and the contact to the underlying Unit − 1. Unit 0 is the best-developed unit in the kakortokites and as such is ideal for gaining insight into processes of crystal formation and growth within the layered kakortokite. The findings are consistent with a model whereby the bulk of the black and red layers developed through in situ crystallisation at the crystal mush–magma interface, whereas the white layer developed through a range of processes operating throughout the magma chamber, including density segregation (gravitational settling and flotation). Primary textures were modified through late-stage textural coarsening via grain overgrowth. An open-system model is proposed, where varying concentrations of halogens, in combination with undercooling, controlled crystal nucleation and growth to form Unit 0. Our observations suggest that the model is applicable more widely to the layering throughout the kakortokite series and potentially other layered peralkaline/agpaitic rocks around the world. |
format |
Article in Journal/Newspaper |
author |
Hunt, Emma J. Finch, Adrian A. Donaldson, Colin H. |
author_facet |
Hunt, Emma J. Finch, Adrian A. Donaldson, Colin H. |
author_sort |
Hunt, Emma J. |
title |
Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland |
title_short |
Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland |
title_full |
Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland |
title_fullStr |
Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland |
title_full_unstemmed |
Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland |
title_sort |
layering in peralkaline magmas, ilímaussaq complex, s greenland |
publishDate |
2017 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/layering-in-peralkaline-magmas-ilimaussaq-complex-s-greenland(f59e3d75-2fe8-4928-b800-26bd924c28e3).html https://doi.org/10.1016/j.lithos.2016.10.023 https://research-repository.st-andrews.ac.uk/bitstream/10023/9817/1/Hunt_et_al_2017_Ilimaussaq_layering.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Hunt , E J , Finch , A A & Donaldson , C H 2017 , ' Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland ' , Lithos , vol. 268-271 , pp. 1-15 . https://doi.org/10.1016/j.lithos.2016.10.023 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/layering-in-peralkaline-magmas-ilimaussaq-complex-s-greenland(f59e3d75-2fe8-4928-b800-26bd924c28e3).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.lithos.2016.10.023 |
container_title |
Lithos |
container_volume |
268-271 |
container_start_page |
1 |
op_container_end_page |
15 |
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1802644866460549120 |