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Carbonatite ring-complexes explained by caldera-style volcanism

Carbonatites are rare, carbonate-rich magmatic rocks that make up a minute portion of the crust only, yet they are of great relevance for our understanding of crustal and mantle processes. Although they occur in all continents and from Archaean to present, the deeper plumbing system of carbonatite r...

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Autores principales: Andersson, Magnus, Malehmir, Alireza, Troll, Valentin R., Dehghannejad, Mahdieh, Juhlin, Christopher, Ask, Maria
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3628075/
https://www.ncbi.nlm.nih.gov/pubmed/23591904
http://dx.doi.org/10.1038/srep01677
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author Andersson, Magnus
Malehmir, Alireza
Troll, Valentin R.
Dehghannejad, Mahdieh
Juhlin, Christopher
Ask, Maria
author_facet Andersson, Magnus
Malehmir, Alireza
Troll, Valentin R.
Dehghannejad, Mahdieh
Juhlin, Christopher
Ask, Maria
author_sort Andersson, Magnus
collection PubMed
description Carbonatites are rare, carbonate-rich magmatic rocks that make up a minute portion of the crust only, yet they are of great relevance for our understanding of crustal and mantle processes. Although they occur in all continents and from Archaean to present, the deeper plumbing system of carbonatite ring-complexes is usually poorly constrained. Here, we show that carbonatite ring-complexes can be explained by caldera-style volcanism. Our geophysical investigation of the Alnö carbonatite ring-complex in central Sweden identifies a solidified saucer-shaped magma chamber at ~3 km depth that links to surface exposures through a ring fault system. Caldera subsidence during final stages of activity caused carbonatite eruptions north of the main complex, providing the crucial element to connect plutonic and eruptive features of carbonatite magmatism. The way carbonatite magmas are stored, transported and erupt at the surface is thus comparable to known emplacement styles from silicic calderas.
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spelling pubmed-36280752013-04-17 Carbonatite ring-complexes explained by caldera-style volcanism Andersson, Magnus Malehmir, Alireza Troll, Valentin R. Dehghannejad, Mahdieh Juhlin, Christopher Ask, Maria Sci Rep Article Carbonatites are rare, carbonate-rich magmatic rocks that make up a minute portion of the crust only, yet they are of great relevance for our understanding of crustal and mantle processes. Although they occur in all continents and from Archaean to present, the deeper plumbing system of carbonatite ring-complexes is usually poorly constrained. Here, we show that carbonatite ring-complexes can be explained by caldera-style volcanism. Our geophysical investigation of the Alnö carbonatite ring-complex in central Sweden identifies a solidified saucer-shaped magma chamber at ~3 km depth that links to surface exposures through a ring fault system. Caldera subsidence during final stages of activity caused carbonatite eruptions north of the main complex, providing the crucial element to connect plutonic and eruptive features of carbonatite magmatism. The way carbonatite magmas are stored, transported and erupt at the surface is thus comparable to known emplacement styles from silicic calderas. Nature Publishing Group 2013-04-17 /pmc/articles/PMC3628075/ /pubmed/23591904 http://dx.doi.org/10.1038/srep01677 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
spellingShingle Article
Andersson, Magnus
Malehmir, Alireza
Troll, Valentin R.
Dehghannejad, Mahdieh
Juhlin, Christopher
Ask, Maria
Carbonatite ring-complexes explained by caldera-style volcanism
title Carbonatite ring-complexes explained by caldera-style volcanism
title_full Carbonatite ring-complexes explained by caldera-style volcanism
title_fullStr Carbonatite ring-complexes explained by caldera-style volcanism
title_full_unstemmed Carbonatite ring-complexes explained by caldera-style volcanism
title_short Carbonatite ring-complexes explained by caldera-style volcanism
title_sort carbonatite ring-complexes explained by caldera-style volcanism
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3628075/
https://www.ncbi.nlm.nih.gov/pubmed/23591904
http://dx.doi.org/10.1038/srep01677
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