Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360
Knowledge of the subduction input flux of nitrogen (N) in altered oceanic crust (AOC) is critical in any attempt to mass-balance N across arc-trench systems on a global or individual-margin basis. We have employed sealed-tube, carrier-gas-based methods to examine the N concentrations and isotopic co...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA - Data Publisher for Earth & Environmental Science
2007
|
Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.711140 https://doi.pangaea.de/10.1594/PANGAEA.711140 |
id |
ftdatacite:10.1594/pangaea.711140 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.1594/pangaea.711140 2023-05-15T13:38:45+02:00 Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 Li, Long Bebout, Gray E Idleman, Bruce D 2007 application/zip https://dx.doi.org/10.1594/pangaea.711140 https://doi.pangaea.de/10.1594/PANGAEA.711140 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.gca.2007.02.001 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 Leg129 Leg185 Glomar Challenger Joides Resolution Deep Sea Drilling Project DSDP Ocean Drilling Program ODP Supplementary Collection of Datasets article Collection 2007 ftdatacite https://doi.org/10.1594/pangaea.711140 https://doi.org/10.1016/j.gca.2007.02.001 2022-04-01T14:07:00Z Knowledge of the subduction input flux of nitrogen (N) in altered oceanic crust (AOC) is critical in any attempt to mass-balance N across arc-trench systems on a global or individual-margin basis. We have employed sealed-tube, carrier-gas-based methods to examine the N concentrations and isotopic compositions of AOC. Analyses of 53 AOC samples recovered on DSDP/ODP legs from the North and South Pacific, the North Atlantic, and the Antarctic oceans (with larger numbers of samples from Site 801 outboard of the Mariana trench and Site 1149 outboard of the Izu trench), and 14 composites for the AOC sections at Site 801, give N concentrations of 1.3 to 18.2 ppm and d15N_air of -11.6‰ to +8.3‰, indicating significant N enrichment probably during the early stages of hydrothermal alteration of the oceanic basalts. The N-d15N modeling for samples from Sites 801 and 1149 (n=39) shows that the secondary N may come from (1) the sedimentary N in the intercalated sediments and possibly overlying sediments via fluid-sediment/rock interaction, and (2) degassed mantle N2 in seawater via alteration-related abiotic reduction processes. For all Site 801 samples, weak correlation of N and K2O contents indicates that the siting of N in potassic alteration phases strongly depends on N availability and is possibly influenced by highly heterogeneous temperature and redox conditions during hydrothermal alteration.The upper 470-m AOC recovered by ODP Legs 129 and 185 delivers approximately 800 kg/km N annually into the Mariana margin. If the remaining less-altered oceanic crust (assuming 6.5 km, mostly dikes and gabbros) has MORB-like N of 1.5 ppm, the entire oceanic crust transfers 5100 kg/km N annually into that trench. This N input flux is twice as large as the annual N input of 2500 kg/km in seafloor sediments subducting into the same margin, demonstrating that the N input in oceanic crust, and its isotopic consequences, must be considered in any assessment of convergent margin N flux. Dataset Antarc* Antarctic North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Antarctic Pacific The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 Leg129 Leg185 Glomar Challenger Joides Resolution Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
spellingShingle |
Drilling/drill rig Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 Leg129 Leg185 Glomar Challenger Joides Resolution Deep Sea Drilling Project DSDP Ocean Drilling Program ODP Li, Long Bebout, Gray E Idleman, Bruce D Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 |
topic_facet |
Drilling/drill rig Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 Leg129 Leg185 Glomar Challenger Joides Resolution Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
description |
Knowledge of the subduction input flux of nitrogen (N) in altered oceanic crust (AOC) is critical in any attempt to mass-balance N across arc-trench systems on a global or individual-margin basis. We have employed sealed-tube, carrier-gas-based methods to examine the N concentrations and isotopic compositions of AOC. Analyses of 53 AOC samples recovered on DSDP/ODP legs from the North and South Pacific, the North Atlantic, and the Antarctic oceans (with larger numbers of samples from Site 801 outboard of the Mariana trench and Site 1149 outboard of the Izu trench), and 14 composites for the AOC sections at Site 801, give N concentrations of 1.3 to 18.2 ppm and d15N_air of -11.6‰ to +8.3‰, indicating significant N enrichment probably during the early stages of hydrothermal alteration of the oceanic basalts. The N-d15N modeling for samples from Sites 801 and 1149 (n=39) shows that the secondary N may come from (1) the sedimentary N in the intercalated sediments and possibly overlying sediments via fluid-sediment/rock interaction, and (2) degassed mantle N2 in seawater via alteration-related abiotic reduction processes. For all Site 801 samples, weak correlation of N and K2O contents indicates that the siting of N in potassic alteration phases strongly depends on N availability and is possibly influenced by highly heterogeneous temperature and redox conditions during hydrothermal alteration.The upper 470-m AOC recovered by ODP Legs 129 and 185 delivers approximately 800 kg/km N annually into the Mariana margin. If the remaining less-altered oceanic crust (assuming 6.5 km, mostly dikes and gabbros) has MORB-like N of 1.5 ppm, the entire oceanic crust transfers 5100 kg/km N annually into that trench. This N input flux is twice as large as the annual N input of 2500 kg/km in seafloor sediments subducting into the same margin, demonstrating that the N input in oceanic crust, and its isotopic consequences, must be considered in any assessment of convergent margin N flux. |
format |
Dataset |
author |
Li, Long Bebout, Gray E Idleman, Bruce D |
author_facet |
Li, Long Bebout, Gray E Idleman, Bruce D |
author_sort |
Li, Long |
title |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 |
title_short |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 |
title_full |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 |
title_fullStr |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 |
title_full_unstemmed |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185, supplement to: Li, Long; Bebout, Gray E; Idleman, Bruce D (2007): Nitrogen concentration and delta 15N of altered oceanic crust obtained on ODP Legs 129 and 185: Insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. Geochimica et Cosmochimica Acta, 71(9), 2344-2360 |
title_sort |
nitrogen isotopic composition and chemical composition of altered oceanic crust from odp legs 129 and 185, supplement to: li, long; bebout, gray e; idleman, bruce d (2007): nitrogen concentration and delta 15n of altered oceanic crust obtained on odp legs 129 and 185: insights into alteration-related nitrogen enrichment and the nitrogen subduction budget. geochimica et cosmochimica acta, 71(9), 2344-2360 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2007 |
url |
https://dx.doi.org/10.1594/pangaea.711140 https://doi.pangaea.de/10.1594/PANGAEA.711140 |
geographic |
Antarctic Pacific The Antarctic |
geographic_facet |
Antarctic Pacific The Antarctic |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_relation |
https://dx.doi.org/10.1016/j.gca.2007.02.001 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.711140 https://doi.org/10.1016/j.gca.2007.02.001 |
_version_ |
1766110734404550656 |