Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland
This is the author accepted manuscript. The final version is available from Oxford University Press via the DOI in this record The Skaergaard Intrusion of East Greenland solidified as a closed system, with the development of progressively more fractionated material at the roof, floor and vertical wa...
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ftunivexeter:oai:ore.exeter.ac.uk:10871/129880 2024-09-09T19:38:41+00:00 Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland Holness, MB Humphreys, MCS Namur, O Andersen, JCØ Tegner, C Nielsen, TFD 2021 egab100-- http://hdl.handle.net/10871/129880 https://doi.org/10.1093/petrology/egab100 en eng Oxford University Press Journal of Petrology, 63(1) orcid:0000-0002-9939-8682 (Andersen, Jens CØ) Vol. 63, No. 1, article egab100 https://doi.org/10.1093/petrology/egab100 NE/N009894/1 NE/J020877/2 http://hdl.handle.net/10871/129880 0022-3530 1460-2415 Journal of Petrology © The Author(s) 2021. Published by Oxford University Press. All rights reserved. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) 2022-12-14 Under embargo until 14 December 2022 in compliance with publisher policy http://www.rioxx.net/licenses/all-rights-reserved layered intrusion gabbro cumulate crystal mush Article 2021 ftunivexeter https://doi.org/10.1093/petrology/egab100 2024-07-29T03:24:14Z This is the author accepted manuscript. The final version is available from Oxford University Press via the DOI in this record The Skaergaard Intrusion of East Greenland solidified as a closed system, with the development of progressively more fractionated material at the roof, floor and vertical walls of the magma chamber. We argue, using field observations of the exposed western margin together with detailed microstructural and geochemical analysis, that the mush on the vertical walls of the Skaergaard Intrusion reached a maximum thickness of ~180 m, and was highly unstable. Material was lost both continuously, due to non-retention of poorly consolidated material, and during episodic collapse events. The almost complete absence in the wall rocks of material formed in LZc times (following the saturation of the bulk magma in Fe-Ti oxides) was likely to have been caused by a collapse event, perhaps related to faulting of the actively extending Greenlandic margin. A second major collapse of the MBS occurred during the later stages of solidification, with the greatest loss of material occurring in a region of the wall with an unusually thick mush, creating a transient and localised increase in the thickness of the floor mush. This work demonstrates the importance of vertical walls in supplying loose, disaggregated material to form mobile magmatic slurries that may contribute to floor cumulates or be entrained and erupted in long-lived systems. Natural Environment Research Council Natural Environment Research Council Royal Society Carlsberg Foundation GEUS Trinity College University of Cambridge Article in Journal/Newspaper East Greenland Greenland greenlandic University of Exeter: Open Research Exeter (ORE) Greenland Wall Rocks ENVELOPE(-129.312,-129.312,52.728,52.728) Journal of Petrology 63 1 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
topic |
layered intrusion gabbro cumulate crystal mush |
spellingShingle |
layered intrusion gabbro cumulate crystal mush Holness, MB Humphreys, MCS Namur, O Andersen, JCØ Tegner, C Nielsen, TFD Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland |
topic_facet |
layered intrusion gabbro cumulate crystal mush |
description |
This is the author accepted manuscript. The final version is available from Oxford University Press via the DOI in this record The Skaergaard Intrusion of East Greenland solidified as a closed system, with the development of progressively more fractionated material at the roof, floor and vertical walls of the magma chamber. We argue, using field observations of the exposed western margin together with detailed microstructural and geochemical analysis, that the mush on the vertical walls of the Skaergaard Intrusion reached a maximum thickness of ~180 m, and was highly unstable. Material was lost both continuously, due to non-retention of poorly consolidated material, and during episodic collapse events. The almost complete absence in the wall rocks of material formed in LZc times (following the saturation of the bulk magma in Fe-Ti oxides) was likely to have been caused by a collapse event, perhaps related to faulting of the actively extending Greenlandic margin. A second major collapse of the MBS occurred during the later stages of solidification, with the greatest loss of material occurring in a region of the wall with an unusually thick mush, creating a transient and localised increase in the thickness of the floor mush. This work demonstrates the importance of vertical walls in supplying loose, disaggregated material to form mobile magmatic slurries that may contribute to floor cumulates or be entrained and erupted in long-lived systems. Natural Environment Research Council Natural Environment Research Council Royal Society Carlsberg Foundation GEUS Trinity College University of Cambridge |
format |
Article in Journal/Newspaper |
author |
Holness, MB Humphreys, MCS Namur, O Andersen, JCØ Tegner, C Nielsen, TFD |
author_facet |
Holness, MB Humphreys, MCS Namur, O Andersen, JCØ Tegner, C Nielsen, TFD |
author_sort |
Holness, MB |
title |
Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland |
title_short |
Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland |
title_full |
Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland |
title_fullStr |
Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland |
title_full_unstemmed |
Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland |
title_sort |
crystal mush growth and collapse on a steep wall: the marginal border series of the skaergaard intrusion, east greenland |
publisher |
Oxford University Press |
publishDate |
2021 |
url |
http://hdl.handle.net/10871/129880 https://doi.org/10.1093/petrology/egab100 |
long_lat |
ENVELOPE(-129.312,-129.312,52.728,52.728) |
geographic |
Greenland Wall Rocks |
geographic_facet |
Greenland Wall Rocks |
genre |
East Greenland Greenland greenlandic |
genre_facet |
East Greenland Greenland greenlandic |
op_relation |
Journal of Petrology, 63(1) orcid:0000-0002-9939-8682 (Andersen, Jens CØ) Vol. 63, No. 1, article egab100 https://doi.org/10.1093/petrology/egab100 NE/N009894/1 NE/J020877/2 http://hdl.handle.net/10871/129880 0022-3530 1460-2415 Journal of Petrology |
op_rights |
© The Author(s) 2021. Published by Oxford University Press. All rights reserved. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) 2022-12-14 Under embargo until 14 December 2022 in compliance with publisher policy http://www.rioxx.net/licenses/all-rights-reserved |
op_doi |
https://doi.org/10.1093/petrology/egab100 |
container_title |
Journal of Petrology |
container_volume |
63 |
container_issue |
1 |
_version_ |
1809907589785321472 |