| Title: |
Deep Nitrogen Fluxes and Sources Constrained by Arc Lava Phenocrysts |
| Authors: |
Hudak, Michael; Barry, Peter; Bekaert, David; Turner, Stephen; Broadley, Michael; Walowski, Kristina; Tyne, Rebecca; Li, Kan; Nielsen, Sune; Curtice, Joshua; Kurz, Mark; Cahoon, Emily; Wallace, Paul; Muth, Michelle; Shaw, Alison |
| Contributors: |
Williams College Williamstown; Woods Hole Oceanographic Institution (WHOI); Centre de Recherches Pétrographiques et Géochimiques (CRPG); Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS); University of Manchester Manchester; Western Washington University (WWU); Department of Marine Chemistry and Geochemistry (WHOI); Oregon State University (OSU); University of Oregon Eugene; University of Washington Seattle; Lorax Environmental Services Ltd, Vancouver, BC, Canada; This work was supported by NSF Grants OCE-PRF 2126355 and 2324745 to MRH and OCE and EAR Grants 2015789, 2152551, 2151120, and 2121637 to PHB. |
| Source: |
ISSN: 0094-8276. |
| Publisher Information: |
CCSD; American Geophysical Union |
| Publication Year: |
2024 |
| Collection: |
Université de Lorraine: HAL |
| Subject Terms: |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
| Description: |
International audience ; Abstract Nitrogen (N) dominates Earth's atmosphere (78% N 2 ) but occurs in trace abundances in silicate minerals, making it a sensitive tracer of recycled surface materials into the mantle. The mechanisms controlling N transfer between terrestrial reservoirs remain uncertain because low N abundances in mineral‐hosted fluid inclusions (FIs) are difficult to measure. Using new techniques, we analyzed N and He isotope compositions and abundances in olivine‐ and pyroxene‐hosted FIs from arc volcanoes in Southern Chile, Cascadia, Central America, and the Southern Marianas. These measurements enable an estimate of the global flux of N outgassing from arcs (4.0 × 10 10 mol/yr). This suggests that Earth is currently in a state of net N ingassing, with roughly half of subducted N returned to the mantle. Additionally, the N outgassing flux of individual arcs correlates with the thickness of subducting pelagic sediment, suggesting that N cycling in the modern solid Earth is largely controlled by sediment subduction. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1029/2024GL111312 |
| Availability: |
https://hal.science/hal-05344178; https://hal.science/hal-05344178v1/document; https://hal.science/hal-05344178v1/file/Hudaketal_NisotopesArcs_GRL_2024.pdf; https://doi.org/10.1029/2024GL111312 |
| Rights: |
http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.76FDE9DF |
| Database: |
BASE |