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Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure

Efficient recycling of subducted sedimentary nitrogen (N) back to the atmosphere through arc volcanism has been advocated for the Central America margin while at other locations mass balance considerations and N contents of high pressure metamorphic rocks imply massive addition of subducted N to the...

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Autores principales: Lee, Hyunwoo, Fischer, Tobias P., de Moor, J. Maarten, Sharp, Zachary D., Takahata, Naoto, Sano, Yuji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5654979/
https://www.ncbi.nlm.nih.gov/pubmed/29066787
http://dx.doi.org/10.1038/s41598-017-14287-y
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author Lee, Hyunwoo
Fischer, Tobias P.
de Moor, J. Maarten
Sharp, Zachary D.
Takahata, Naoto
Sano, Yuji
author_facet Lee, Hyunwoo
Fischer, Tobias P.
de Moor, J. Maarten
Sharp, Zachary D.
Takahata, Naoto
Sano, Yuji
author_sort Lee, Hyunwoo
collection PubMed
description Efficient recycling of subducted sedimentary nitrogen (N) back to the atmosphere through arc volcanism has been advocated for the Central America margin while at other locations mass balance considerations and N contents of high pressure metamorphic rocks imply massive addition of subducted N to the mantle and past the zones of arc magma generation. Here, we report new results of N isotope compositions with gas chemistry and noble gas compositions of forearc and arc front springs in Costa Rica to show that the structure of the incoming plate has a profound effect on the extent of N subduction into the mantle. N isotope compositions of emitted arc gases (9–11 N°) imply less subducted pelagic sediment contribution compared to farther north. The N isotope compositions (δ(15)N = −4.4 to 1.6‰) of forearc springs at 9–11 N° are consistent with previously reported values in volcanic centers (δ(15)N = −3.0 to 1.9‰). We advocate that subduction erosion enhanced by abundant seamount subduction at 9–11 N° introduces overlying forearc crustal materials into the Costa Rican subduction zone, releasing fluids with lighter N isotope signatures. This process supports the recycling of heavier N into the deep mantle in this section of the Central America margin.
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spelling pubmed-56549792017-10-31 Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure Lee, Hyunwoo Fischer, Tobias P. de Moor, J. Maarten Sharp, Zachary D. Takahata, Naoto Sano, Yuji Sci Rep Article Efficient recycling of subducted sedimentary nitrogen (N) back to the atmosphere through arc volcanism has been advocated for the Central America margin while at other locations mass balance considerations and N contents of high pressure metamorphic rocks imply massive addition of subducted N to the mantle and past the zones of arc magma generation. Here, we report new results of N isotope compositions with gas chemistry and noble gas compositions of forearc and arc front springs in Costa Rica to show that the structure of the incoming plate has a profound effect on the extent of N subduction into the mantle. N isotope compositions of emitted arc gases (9–11 N°) imply less subducted pelagic sediment contribution compared to farther north. The N isotope compositions (δ(15)N = −4.4 to 1.6‰) of forearc springs at 9–11 N° are consistent with previously reported values in volcanic centers (δ(15)N = −3.0 to 1.9‰). We advocate that subduction erosion enhanced by abundant seamount subduction at 9–11 N° introduces overlying forearc crustal materials into the Costa Rican subduction zone, releasing fluids with lighter N isotope signatures. This process supports the recycling of heavier N into the deep mantle in this section of the Central America margin. Nature Publishing Group UK 2017-10-24 /pmc/articles/PMC5654979/ /pubmed/29066787 http://dx.doi.org/10.1038/s41598-017-14287-y Text en © The Author(s) 2017 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
Lee, Hyunwoo
Fischer, Tobias P.
de Moor, J. Maarten
Sharp, Zachary D.
Takahata, Naoto
Sano, Yuji
Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
title Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
title_full Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
title_fullStr Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
title_full_unstemmed Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
title_short Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
title_sort nitrogen recycling at the costa rican subduction zone: the role of incoming plate structure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5654979/
https://www.ncbi.nlm.nih.gov/pubmed/29066787
http://dx.doi.org/10.1038/s41598-017-14287-y
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