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Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile
The Andean continental arc is built upon the thickest crust on Earth, whose eruption products reflect varying degrees of crustal assimilation. In order to robustly model magma evolution and assimilation at subduction zones such as the Andes, the compositions of parental magmas feeding crustal magma...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7176692/ https://www.ncbi.nlm.nih.gov/pubmed/32321945 http://dx.doi.org/10.1038/s41598-020-63454-1 |
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author | González-Maurel, Osvaldo Deegan, Frances M. le Roux, Petrus Harris, Chris Troll, Valentin R. Godoy, Benigno |
author_facet | González-Maurel, Osvaldo Deegan, Frances M. le Roux, Petrus Harris, Chris Troll, Valentin R. Godoy, Benigno |
author_sort | González-Maurel, Osvaldo |
collection | PubMed |
description | The Andean continental arc is built upon the thickest crust on Earth, whose eruption products reflect varying degrees of crustal assimilation. In order to robustly model magma evolution and assimilation at subduction zones such as the Andes, the compositions of parental magmas feeding crustal magma reservoirs need to be defined. Here we present new olivine and clinopyroxene oxygen isotope data from rare mafic volcanic rocks erupted at the margins of the giant Altiplano-Puna Magma Body (APMB) of the Altiplano-Puna Volcanic Complex, Central Andes. Existing olivine and pyroxene δ(18)O values for the Central Andes are highly variable and potentially not representative of sub-arc parental compositions. However, new olivine (n = 6) and clinopyroxene (n = 12) δ(18)O values of six Central Andean volcanoes presented here display a narrow range, with averages at 6.0‰ ± 0.2 (2σ S.D.) and 6.7‰ ± 0.3 (2σ S.D.), consistent with a common history for the investigated minerals. These data allow us to estimate the δ(18)O values of sub-arc, parental melts to ca. 7.0‰ ± 0.2 (2σ S.D.). Parental melts feeding the APMB and associated volcanic centres are postulated to form in the felsic continental crust following assimilation of up to 28% high-δ(18)O basement rocks by mantle-derived magmas. |
format | Online Article Text |
id | pubmed-7176692 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-71766922020-04-27 Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile González-Maurel, Osvaldo Deegan, Frances M. le Roux, Petrus Harris, Chris Troll, Valentin R. Godoy, Benigno Sci Rep Article The Andean continental arc is built upon the thickest crust on Earth, whose eruption products reflect varying degrees of crustal assimilation. In order to robustly model magma evolution and assimilation at subduction zones such as the Andes, the compositions of parental magmas feeding crustal magma reservoirs need to be defined. Here we present new olivine and clinopyroxene oxygen isotope data from rare mafic volcanic rocks erupted at the margins of the giant Altiplano-Puna Magma Body (APMB) of the Altiplano-Puna Volcanic Complex, Central Andes. Existing olivine and pyroxene δ(18)O values for the Central Andes are highly variable and potentially not representative of sub-arc parental compositions. However, new olivine (n = 6) and clinopyroxene (n = 12) δ(18)O values of six Central Andean volcanoes presented here display a narrow range, with averages at 6.0‰ ± 0.2 (2σ S.D.) and 6.7‰ ± 0.3 (2σ S.D.), consistent with a common history for the investigated minerals. These data allow us to estimate the δ(18)O values of sub-arc, parental melts to ca. 7.0‰ ± 0.2 (2σ S.D.). Parental melts feeding the APMB and associated volcanic centres are postulated to form in the felsic continental crust following assimilation of up to 28% high-δ(18)O basement rocks by mantle-derived magmas. Nature Publishing Group UK 2020-04-22 /pmc/articles/PMC7176692/ /pubmed/32321945 http://dx.doi.org/10.1038/s41598-020-63454-1 Text en © The Author(s) 2020 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/. |
spellingShingle | Article González-Maurel, Osvaldo Deegan, Frances M. le Roux, Petrus Harris, Chris Troll, Valentin R. Godoy, Benigno Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile |
title | Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile |
title_full | Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile |
title_fullStr | Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile |
title_full_unstemmed | Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile |
title_short | Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile |
title_sort | constraining the sub-arc, parental magma composition for the giant altiplano-puna volcanic complex, northern chile |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7176692/ https://www.ncbi.nlm.nih.gov/pubmed/32321945 http://dx.doi.org/10.1038/s41598-020-63454-1 |
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