Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years
The effect of seeping of methane on marine sediment records has been studied in four gravity cores from Vestnesa Ridge, Svalbard margin. The area shows acoustic signs in the form of flares indicating active methane gas seepage. For a better understanding of the timing and variability of the flux of...
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crwiley:10.1111/bor.12202 2024-06-23T07:52:54+00:00 Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years Sztybor, Kamila Rasmussen, Tine L. Universitetet i Tromsø Norges Forskningsråd 2016 http://dx.doi.org/10.1111/bor.12202 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12202 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12202 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 46, issue 2, page 212-228 ISSN 0300-9483 1502-3885 journal-article 2016 crwiley https://doi.org/10.1111/bor.12202 2024-06-13T04:22:28Z The effect of seeping of methane on marine sediment records has been studied in four gravity cores from Vestnesa Ridge, Svalbard margin. The area shows acoustic signs in the form of flares indicating active methane gas seepage. For a better understanding of the timing and variability of the flux of methane in the past and the effects on potential proxies, a detailed study of the diagenetic processes that may affect the composition and structure of both sediments and foraminiferal shells is needed. Here we discuss deep‐sea records from methane‐influenced environments in three cores from an active and very heterogeneous seep‐area (pockmark) and one core from outside the pockmark for background. The results include the distribution and stable isotopes of authigenic carbonates and of benthic and planktonic foraminifera, magnetic susceptibility, AMS ‐ 14 C dates, sedimentary data and biostratigraphy. Extremely low δ 13 C values recorded in both benthic and planktonic foraminifera during the Bølling‐Allerød interstadials indicate possible increased methane flux beginning at late Heinrich event H1. The recorded low values are mainly a result of diagenetic overprint by methane‐derived authigenic carbonates. The δ 18 O signals of authigenic carbonates are close to those of foraminiferal calcite and thus the δ 18 O records remain a valid stratigraphical tool in methane seep sites, except in the case of severely encrusted samples. In addition, the records from the active pockmark show nearly constant values of low magnetic susceptibility in contrast to higher and more variable magnetic susceptibility values from the control station and other published records from normal sediments west of Svalbard. This phenomenon is probably caused by dissolution of magnetic minerals in the reducing environmental conditions of methane seep sediments, associated with anaerobic oxidation of methane and formation of paramagnetic minerals (pyrite). This process enables magnetic susceptibility to be used as a common diagnostic tool for ... Article in Journal/Newspaper Fram Strait Planktonic foraminifera Svalbard Svalbard margin Wiley Online Library Svalbard Boreas 46 2 212 228 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The effect of seeping of methane on marine sediment records has been studied in four gravity cores from Vestnesa Ridge, Svalbard margin. The area shows acoustic signs in the form of flares indicating active methane gas seepage. For a better understanding of the timing and variability of the flux of methane in the past and the effects on potential proxies, a detailed study of the diagenetic processes that may affect the composition and structure of both sediments and foraminiferal shells is needed. Here we discuss deep‐sea records from methane‐influenced environments in three cores from an active and very heterogeneous seep‐area (pockmark) and one core from outside the pockmark for background. The results include the distribution and stable isotopes of authigenic carbonates and of benthic and planktonic foraminifera, magnetic susceptibility, AMS ‐ 14 C dates, sedimentary data and biostratigraphy. Extremely low δ 13 C values recorded in both benthic and planktonic foraminifera during the Bølling‐Allerød interstadials indicate possible increased methane flux beginning at late Heinrich event H1. The recorded low values are mainly a result of diagenetic overprint by methane‐derived authigenic carbonates. The δ 18 O signals of authigenic carbonates are close to those of foraminiferal calcite and thus the δ 18 O records remain a valid stratigraphical tool in methane seep sites, except in the case of severely encrusted samples. In addition, the records from the active pockmark show nearly constant values of low magnetic susceptibility in contrast to higher and more variable magnetic susceptibility values from the control station and other published records from normal sediments west of Svalbard. This phenomenon is probably caused by dissolution of magnetic minerals in the reducing environmental conditions of methane seep sediments, associated with anaerobic oxidation of methane and formation of paramagnetic minerals (pyrite). This process enables magnetic susceptibility to be used as a common diagnostic tool for ... |
author2 |
Universitetet i Tromsø Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Sztybor, Kamila Rasmussen, Tine L. |
spellingShingle |
Sztybor, Kamila Rasmussen, Tine L. Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years |
author_facet |
Sztybor, Kamila Rasmussen, Tine L. |
author_sort |
Sztybor, Kamila |
title |
Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years |
title_short |
Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years |
title_full |
Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years |
title_fullStr |
Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years |
title_full_unstemmed |
Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years |
title_sort |
diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the fram strait as indications of variation in seep intensity during the last 35 000 years |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/bor.12202 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12202 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12202 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Fram Strait Planktonic foraminifera Svalbard Svalbard margin |
genre_facet |
Fram Strait Planktonic foraminifera Svalbard Svalbard margin |
op_source |
Boreas volume 46, issue 2, page 212-228 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12202 |
container_title |
Boreas |
container_volume |
46 |
container_issue |
2 |
container_start_page |
212 |
op_container_end_page |
228 |
_version_ |
1802644324202053632 |