Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185
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...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.711140 2024-09-15T17:43:06+00:00 Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185 Li, Long Bebout, Gray E Idleman, Bruce D MEDIAN LATITUDE: 19.122250 * MEDIAN LONGITUDE: 164.474663 * SOUTH-BOUND LATITUDE: -51.335700 * WEST-BOUND LONGITUDE: 134.874200 * NORTH-BOUND LATITUDE: 36.878700 * EAST-BOUND LONGITUDE: -33.641000 * DATE/TIME START: 1973-03-20T00:00:00 * DATE/TIME END: 1999-06-13T16:15:00 2007 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.711140 https://doi.org/10.1594/PANGAEA.711140 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.711140 https://doi.org/10.1594/PANGAEA.711140 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess 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, https://doi.org/10.1016/j.gca.2007.02.001 129-801B 129-801C 185-1149B 185-1149C 185-1149D 185-801C 29-279A 34-319A 37-332B 46-396B 51-417A 51-417D 59-448 59-448A 60-458 60-459B 61-462A 70-504B Antarctic Ocean/Tasman Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg129 Leg185 Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 North Atlantic/CONT RISE North Atlantic/VALLEY North Pacific/Philippine Sea/RIDGE North Pacific/SEDIMENT POND North Pacific/TRENCH North Pacific Ocean Ocean Drilling Program ODP South Pacific/BASIN dataset publication series 2007 ftpangaea https://doi.org/10.1594/PANGAEA.71114010.1016/j.gca.2007.02.001 2024-07-24T02:31:42Z 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. Other/Unknown Material Antarc* Antarctic Antarctic Ocean North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(134.874200,-33.641000,36.878700,-51.335700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
129-801B 129-801C 185-1149B 185-1149C 185-1149D 185-801C 29-279A 34-319A 37-332B 46-396B 51-417A 51-417D 59-448 59-448A 60-458 60-459B 61-462A 70-504B Antarctic Ocean/Tasman Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg129 Leg185 Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 North Atlantic/CONT RISE North Atlantic/VALLEY North Pacific/Philippine Sea/RIDGE North Pacific/SEDIMENT POND North Pacific/TRENCH North Pacific Ocean Ocean Drilling Program ODP South Pacific/BASIN |
spellingShingle |
129-801B 129-801C 185-1149B 185-1149C 185-1149D 185-801C 29-279A 34-319A 37-332B 46-396B 51-417A 51-417D 59-448 59-448A 60-458 60-459B 61-462A 70-504B Antarctic Ocean/Tasman Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg129 Leg185 Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 North Atlantic/CONT RISE North Atlantic/VALLEY North Pacific/Philippine Sea/RIDGE North Pacific/SEDIMENT POND North Pacific/TRENCH North Pacific Ocean Ocean Drilling Program ODP South Pacific/BASIN Li, Long Bebout, Gray E Idleman, Bruce D Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185 |
topic_facet |
129-801B 129-801C 185-1149B 185-1149C 185-1149D 185-801C 29-279A 34-319A 37-332B 46-396B 51-417A 51-417D 59-448 59-448A 60-458 60-459B 61-462A 70-504B Antarctic Ocean/Tasman Sea/RIDGE Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg129 Leg185 Leg29 Leg34 Leg37 Leg46 Leg51 Leg59 Leg60 Leg61 Leg70 North Atlantic/CONT RISE North Atlantic/VALLEY North Pacific/Philippine Sea/RIDGE North Pacific/SEDIMENT POND North Pacific/TRENCH North Pacific Ocean Ocean Drilling Program ODP South Pacific/BASIN |
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 |
Other/Unknown Material |
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 |
title_short |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185 |
title_full |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185 |
title_fullStr |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185 |
title_full_unstemmed |
Nitrogen isotopic composition and chemical composition of altered oceanic crust from ODP Legs 129 and 185 |
title_sort |
nitrogen isotopic composition and chemical composition of altered oceanic crust from odp legs 129 and 185 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.711140 https://doi.org/10.1594/PANGAEA.711140 |
op_coverage |
MEDIAN LATITUDE: 19.122250 * MEDIAN LONGITUDE: 164.474663 * SOUTH-BOUND LATITUDE: -51.335700 * WEST-BOUND LONGITUDE: 134.874200 * NORTH-BOUND LATITUDE: 36.878700 * EAST-BOUND LONGITUDE: -33.641000 * DATE/TIME START: 1973-03-20T00:00:00 * DATE/TIME END: 1999-06-13T16:15:00 |
long_lat |
ENVELOPE(134.874200,-33.641000,36.878700,-51.335700) |
genre |
Antarc* Antarctic Antarctic Ocean North Atlantic |
genre_facet |
Antarc* Antarctic Antarctic Ocean North Atlantic |
op_source |
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, https://doi.org/10.1016/j.gca.2007.02.001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.711140 https://doi.org/10.1594/PANGAEA.711140 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71114010.1016/j.gca.2007.02.001 |
_version_ |
1810489934459437056 |