Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin
A bottom-simulating reflector (BSR) occurs west of Svalbard in water depths exceeding 600 m, indicating that gas hydrate occurrence in marine sediments is more widespread in this region than anywhere else on the eastern North Atlantic margin. Regional BSR mapping shows the presence of hydrate and fr...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Wiley
2016
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/39563/ http://onlinelibrary.wiley.com/doi/10.1002/2015JB012083/full https://hdl.handle.net/10013/epic.46742 |
id |
ftawi:oai:epic.awi.de:39563 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:39563 2023-05-15T17:34:46+02:00 Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin Dumke, Ines Burwicz, Ewa B. Berndt, Christian Klaeschen, Dirk Feseker, Tomas Geissler, Wolfram Sarkar, Sudipta 2016 https://epic.awi.de/id/eprint/39563/ http://onlinelibrary.wiley.com/doi/10.1002/2015JB012083/full https://hdl.handle.net/10013/epic.46742 unknown Wiley Dumke, I. , Burwicz, E. B. , Berndt, C. , Klaeschen, D. , Feseker, T. , Geissler, W. orcid:0000-0001-6807-555X and Sarkar, S. (2016) Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin , Journal of Geophysical Research-Solid Earth . doi:10.1002/2015JB012083 <https://doi.org/10.1002/2015JB012083> , hdl:10013/epic.46742 EPIC3Journal of Geophysical Research-Solid Earth, Wiley, ISSN: 0148-0227 Article isiRev 2016 ftawi https://doi.org/10.1002/2015JB012083 2021-12-24T15:41:05Z A bottom-simulating reflector (BSR) occurs west of Svalbard in water depths exceeding 600 m, indicating that gas hydrate occurrence in marine sediments is more widespread in this region than anywhere else on the eastern North Atlantic margin. Regional BSR mapping shows the presence of hydrate and free gas in several areas, with the largest area located north of the Knipovich Ridge, a slow-spreading ridge segment of the Mid Atlantic Ridge system. Here, heat flow is high (up to 330 mW m-2), increasing towards the ridge axis. The coinciding maxima in across-margin BSR width and heat flow suggest that the Knipovich Ridge influenced methane generation in this area. This is supported by recent finds of thermogenic methane at cold seeps north of the ridge termination. To evaluate the source rock potential on the western Svalbard margin, we applied 1D petroleum system modeling at three sites. The modeling shows that temperature and burial conditions near the ridge were sufficient to produce hydrocarbons. The bulk petroleum mass produced since the Eocene is at least 5 kt and could be as high as ~0.2 Mt. Most likely, source rocks are Miocene organic-rich sediments and a potential Eocene source rock that may exist in the area if early rifting created sufficiently deep depocenters. Thermogenic methane production could thus explain the more widespread presence of gas hydrates north of the Knipovich Ridge. The presence of microbial methane on the upper continental slope and shelf indicates that the origin of methane on the Svalbard margin varies spatially. Article in Journal/Newspaper North Atlantic Svalbard Svalbard margin Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Svalbard Mid-Atlantic Ridge Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Journal of Geophysical Research: Solid Earth 121 3 1405 1424 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A bottom-simulating reflector (BSR) occurs west of Svalbard in water depths exceeding 600 m, indicating that gas hydrate occurrence in marine sediments is more widespread in this region than anywhere else on the eastern North Atlantic margin. Regional BSR mapping shows the presence of hydrate and free gas in several areas, with the largest area located north of the Knipovich Ridge, a slow-spreading ridge segment of the Mid Atlantic Ridge system. Here, heat flow is high (up to 330 mW m-2), increasing towards the ridge axis. The coinciding maxima in across-margin BSR width and heat flow suggest that the Knipovich Ridge influenced methane generation in this area. This is supported by recent finds of thermogenic methane at cold seeps north of the ridge termination. To evaluate the source rock potential on the western Svalbard margin, we applied 1D petroleum system modeling at three sites. The modeling shows that temperature and burial conditions near the ridge were sufficient to produce hydrocarbons. The bulk petroleum mass produced since the Eocene is at least 5 kt and could be as high as ~0.2 Mt. Most likely, source rocks are Miocene organic-rich sediments and a potential Eocene source rock that may exist in the area if early rifting created sufficiently deep depocenters. Thermogenic methane production could thus explain the more widespread presence of gas hydrates north of the Knipovich Ridge. The presence of microbial methane on the upper continental slope and shelf indicates that the origin of methane on the Svalbard margin varies spatially. |
format |
Article in Journal/Newspaper |
author |
Dumke, Ines Burwicz, Ewa B. Berndt, Christian Klaeschen, Dirk Feseker, Tomas Geissler, Wolfram Sarkar, Sudipta |
spellingShingle |
Dumke, Ines Burwicz, Ewa B. Berndt, Christian Klaeschen, Dirk Feseker, Tomas Geissler, Wolfram Sarkar, Sudipta Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin |
author_facet |
Dumke, Ines Burwicz, Ewa B. Berndt, Christian Klaeschen, Dirk Feseker, Tomas Geissler, Wolfram Sarkar, Sudipta |
author_sort |
Dumke, Ines |
title |
Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin |
title_short |
Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin |
title_full |
Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin |
title_fullStr |
Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin |
title_full_unstemmed |
Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin |
title_sort |
gas hydrate distribution and hydrocarbon maturation north of the knipovich ridge, western svalbard margin |
publisher |
Wiley |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/39563/ http://onlinelibrary.wiley.com/doi/10.1002/2015JB012083/full https://hdl.handle.net/10013/epic.46742 |
long_lat |
ENVELOPE(7.074,7.074,75.712,75.712) |
geographic |
Svalbard Mid-Atlantic Ridge Knipovich Ridge |
geographic_facet |
Svalbard Mid-Atlantic Ridge Knipovich Ridge |
genre |
North Atlantic Svalbard Svalbard margin |
genre_facet |
North Atlantic Svalbard Svalbard margin |
op_source |
EPIC3Journal of Geophysical Research-Solid Earth, Wiley, ISSN: 0148-0227 |
op_relation |
Dumke, I. , Burwicz, E. B. , Berndt, C. , Klaeschen, D. , Feseker, T. , Geissler, W. orcid:0000-0001-6807-555X and Sarkar, S. (2016) Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin , Journal of Geophysical Research-Solid Earth . doi:10.1002/2015JB012083 <https://doi.org/10.1002/2015JB012083> , hdl:10013/epic.46742 |
op_doi |
https://doi.org/10.1002/2015JB012083 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
121 |
container_issue |
3 |
container_start_page |
1405 |
op_container_end_page |
1424 |
_version_ |
1766133701445419008 |