Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ...
We report on the geochemistry of hydrocarbons and pore waters down to 62.5 mbsf, collected by drilling with the MARUM‐MeBo70 and by gravity coring at the Lunde pockmark in the Vestnesa Ridge. Our data document the origin and transformations of volatiles feeding gas emissions previously documented in...
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ftdatacite:10.1594/pangaea.905864 2023-10-01T03:54:02+02:00 Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... Pape, Thomas Malnati, Janice Bohrmann, Gerhard 2019 application/zip https://dx.doi.org/10.1594/pangaea.905864 https://doi.pangaea.de/10.1594/PANGAEA.905864 en eng PANGAEA https://dx.doi.org/10.1029/2018jb016679 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 Center for Marine Environmental Sciences MARUM article Publication Series of Datasets Collection 2019 ftdatacite https://doi.org/10.1594/pangaea.90586410.1029/2018jb016679 2023-09-04T13:47:41Z We report on the geochemistry of hydrocarbons and pore waters down to 62.5 mbsf, collected by drilling with the MARUM‐MeBo70 and by gravity coring at the Lunde pockmark in the Vestnesa Ridge. Our data document the origin and transformations of volatiles feeding gas emissions previously documented in this region. Gas hydrates are present where a fracture network beneath the pockmark focusses migration of thermogenic hydrocarbons characterized by their C1/C2+ and stable isotopic compositions (δ2H‐CH4, δ13C‐CH4). Measured geothermal gradients (~80°C km‐1) and known formation temperatures (>70°C) suggest that those hydrocarbons are formed at depths >800 mbsf.A combined analytical/modeling approach, including concentration and isotopic mass balances, reveals that pockmark sediments experience diffuse migration of thermogenic hydrocarbons. However, at sites without channeled flow this appears to be limited to depths > ~50 mbsf. At all sites we document a contribution of microbial methanogenesis to the ... Article in Journal/Newspaper Arctic Arctic Ocean Lunde DataCite Metadata Store (German National Library of Science and Technology) Arctic Arctic Ocean Lunde ENVELOPE(50.467,50.467,-66.967,-66.967) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Center for Marine Environmental Sciences MARUM |
spellingShingle |
Center for Marine Environmental Sciences MARUM Pape, Thomas Malnati, Janice Bohrmann, Gerhard Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... |
topic_facet |
Center for Marine Environmental Sciences MARUM |
description |
We report on the geochemistry of hydrocarbons and pore waters down to 62.5 mbsf, collected by drilling with the MARUM‐MeBo70 and by gravity coring at the Lunde pockmark in the Vestnesa Ridge. Our data document the origin and transformations of volatiles feeding gas emissions previously documented in this region. Gas hydrates are present where a fracture network beneath the pockmark focusses migration of thermogenic hydrocarbons characterized by their C1/C2+ and stable isotopic compositions (δ2H‐CH4, δ13C‐CH4). Measured geothermal gradients (~80°C km‐1) and known formation temperatures (>70°C) suggest that those hydrocarbons are formed at depths >800 mbsf.A combined analytical/modeling approach, including concentration and isotopic mass balances, reveals that pockmark sediments experience diffuse migration of thermogenic hydrocarbons. However, at sites without channeled flow this appears to be limited to depths > ~50 mbsf. At all sites we document a contribution of microbial methanogenesis to the ... |
format |
Article in Journal/Newspaper |
author |
Pape, Thomas Malnati, Janice Bohrmann, Gerhard |
author_facet |
Pape, Thomas Malnati, Janice Bohrmann, Gerhard |
author_sort |
Pape, Thomas |
title |
Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... |
title_short |
Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... |
title_full |
Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... |
title_fullStr |
Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... |
title_full_unstemmed |
Physical properties, gas compositon, and δ¹³C DIC measured on sediment cores from an active pockmark on Vestnesa Ridge, Arctic Ocean ... |
title_sort |
physical properties, gas compositon, and δ¹³c dic measured on sediment cores from an active pockmark on vestnesa ridge, arctic ocean ... |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://dx.doi.org/10.1594/pangaea.905864 https://doi.pangaea.de/10.1594/PANGAEA.905864 |
long_lat |
ENVELOPE(50.467,50.467,-66.967,-66.967) |
geographic |
Arctic Arctic Ocean Lunde |
geographic_facet |
Arctic Arctic Ocean Lunde |
genre |
Arctic Arctic Ocean Lunde |
genre_facet |
Arctic Arctic Ocean Lunde |
op_relation |
https://dx.doi.org/10.1029/2018jb016679 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.1594/pangaea.90586410.1029/2018jb016679 |
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1778521275537293312 |