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Magnetite layer formation in the Bushveld Complex of South Africa
The great economic significance of layered mafic-ultramafic intrusions like the Bushveld Complex of South Africa results from the existence within them of some layers highly concentrated in valuable elements. Here we address the origins of the Main Magnetite Layer, a globally important resource of F...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8776793/ https://www.ncbi.nlm.nih.gov/pubmed/35058432 http://dx.doi.org/10.1038/s41467-022-28000-9 |
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author | Yao, Zhuosen Mungall, James E. |
author_facet | Yao, Zhuosen Mungall, James E. |
author_sort | Yao, Zhuosen |
collection | PubMed |
description | The great economic significance of layered mafic-ultramafic intrusions like the Bushveld Complex of South Africa results from the existence within them of some layers highly concentrated in valuable elements. Here we address the origins of the Main Magnetite Layer, a globally important resource of Fe-Ti-V-rich magnetite. Previous models of in situ fractional magnetite crystallization require frequent ad hoc adjustments to the boundary conditions. An alternative model incorporating compositional convection near the top of the pile and infiltration of the pile from beneath by migrating intercumulus melt fits observations without any adjustments. Lateral variations in Cr concentration formerly held as indisputable evidence for in situ crystallization can be accommodated better by models of reactive melt infiltration from below. The choice of models has pivotal ramifications for understanding of the fundamental processes by which crystals accumulate and layers form in layered intrusions. |
format | Online Article Text |
id | pubmed-8776793 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-87767932022-02-04 Magnetite layer formation in the Bushveld Complex of South Africa Yao, Zhuosen Mungall, James E. Nat Commun Article The great economic significance of layered mafic-ultramafic intrusions like the Bushveld Complex of South Africa results from the existence within them of some layers highly concentrated in valuable elements. Here we address the origins of the Main Magnetite Layer, a globally important resource of Fe-Ti-V-rich magnetite. Previous models of in situ fractional magnetite crystallization require frequent ad hoc adjustments to the boundary conditions. An alternative model incorporating compositional convection near the top of the pile and infiltration of the pile from beneath by migrating intercumulus melt fits observations without any adjustments. Lateral variations in Cr concentration formerly held as indisputable evidence for in situ crystallization can be accommodated better by models of reactive melt infiltration from below. The choice of models has pivotal ramifications for understanding of the fundamental processes by which crystals accumulate and layers form in layered intrusions. Nature Publishing Group UK 2022-01-20 /pmc/articles/PMC8776793/ /pubmed/35058432 http://dx.doi.org/10.1038/s41467-022-28000-9 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Yao, Zhuosen Mungall, James E. Magnetite layer formation in the Bushveld Complex of South Africa |
title | Magnetite layer formation in the Bushveld Complex of South Africa |
title_full | Magnetite layer formation in the Bushveld Complex of South Africa |
title_fullStr | Magnetite layer formation in the Bushveld Complex of South Africa |
title_full_unstemmed | Magnetite layer formation in the Bushveld Complex of South Africa |
title_short | Magnetite layer formation in the Bushveld Complex of South Africa |
title_sort | magnetite layer formation in the bushveld complex of south africa |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8776793/ https://www.ncbi.nlm.nih.gov/pubmed/35058432 http://dx.doi.org/10.1038/s41467-022-28000-9 |
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