The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting
The results of a combined geophysical and geochemical research program are presented that focused on Grimsey hydrothermal field (GHF) which is located at 66 degrees 35'30"N, 17 degrees 39'30"W east of the island of Grimsey in the Tjornes Fracture Zone. The vent field is situated...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2001
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/16311/ https://oceanrep.geomar.de/id/eprint/16311/1/Riedel%20et%20al%202001.pdf https://doi.org/10.1016/s0012-821x(01)00519-2 |
id |
ftoceanrep:oai:oceanrep.geomar.de:16311 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:16311 2023-05-15T16:31:13+02:00 The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting Riedel, C. Schmidt, Mark Botz, R. Theilen, F. 2001 text https://oceanrep.geomar.de/id/eprint/16311/ https://oceanrep.geomar.de/id/eprint/16311/1/Riedel%20et%20al%202001.pdf https://doi.org/10.1016/s0012-821x(01)00519-2 en eng Elsevier https://oceanrep.geomar.de/id/eprint/16311/1/Riedel%20et%20al%202001.pdf Riedel, C., Schmidt, M. , Botz, R. and Theilen, F. (2001) The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting. Earth and Planetary Science Letters, 193 (3-4). pp. 409-421. DOI 10.1016/s0012-821x(01)00519-2 <https://doi.org/10.1016/s0012-821x%2801%2900519-2>. doi:10.1016/s0012-821x(01)00519-2 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2001 ftoceanrep https://doi.org/10.1016/s0012-821x(01)00519-2 2023-04-07T15:05:35Z The results of a combined geophysical and geochemical research program are presented that focused on Grimsey hydrothermal field (GHF) which is located at 66 degrees 35'30"N, 17 degrees 39'30"W east of the island of Grimsey in the Tjornes Fracture Zone. The vent field is situated at the sourthernmost tip of a submarine ridge which is connected to the offshore part of the Theistareykir Fissure Swarm. Reflection seismic recordings were interpreted in conjunction with earthquake catalogue data to detect active fault structures and potential heat sources in the subsurface. An inter-linked fracture network forming a downwards converging system of faults connected to a deep-reaching normal fault is assumed to provide the preferential pathways for gases (He-3, CO2, CH4 etc.) migrating from a possible deep-seated gas source (lower crust/upper mantle) to the surface. The location of hydrothermal vents was detected by concentration measurements of dissolved methane in the water column, which coincide with polarity reversals in the seismic seafloor reflection. Both the molecular composition of the gas and the isotopic composition of methane at GHF indicate a predominating abiogenic source (Fischer-Tropsch reactions at 250-500 degreesC) mixed with thermogenic hydrocarbons. New seismic data from the GHF were compared with gas geochemical data which indicate that the thermogenic hydrocarbons are related to (up to 60 m thick) sediments deposited in a basin located east of the ridge. Article in Journal/Newspaper Grimsey Iceland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Earth and Planetary Science Letters 193 3-4 409 421 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The results of a combined geophysical and geochemical research program are presented that focused on Grimsey hydrothermal field (GHF) which is located at 66 degrees 35'30"N, 17 degrees 39'30"W east of the island of Grimsey in the Tjornes Fracture Zone. The vent field is situated at the sourthernmost tip of a submarine ridge which is connected to the offshore part of the Theistareykir Fissure Swarm. Reflection seismic recordings were interpreted in conjunction with earthquake catalogue data to detect active fault structures and potential heat sources in the subsurface. An inter-linked fracture network forming a downwards converging system of faults connected to a deep-reaching normal fault is assumed to provide the preferential pathways for gases (He-3, CO2, CH4 etc.) migrating from a possible deep-seated gas source (lower crust/upper mantle) to the surface. The location of hydrothermal vents was detected by concentration measurements of dissolved methane in the water column, which coincide with polarity reversals in the seismic seafloor reflection. Both the molecular composition of the gas and the isotopic composition of methane at GHF indicate a predominating abiogenic source (Fischer-Tropsch reactions at 250-500 degreesC) mixed with thermogenic hydrocarbons. New seismic data from the GHF were compared with gas geochemical data which indicate that the thermogenic hydrocarbons are related to (up to 60 m thick) sediments deposited in a basin located east of the ridge. |
format |
Article in Journal/Newspaper |
author |
Riedel, C. Schmidt, Mark Botz, R. Theilen, F. |
spellingShingle |
Riedel, C. Schmidt, Mark Botz, R. Theilen, F. The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting |
author_facet |
Riedel, C. Schmidt, Mark Botz, R. Theilen, F. |
author_sort |
Riedel, C. |
title |
The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting |
title_short |
The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting |
title_full |
The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting |
title_fullStr |
The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting |
title_full_unstemmed |
The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting |
title_sort |
grimsey hydrothermal field offshore north iceland: crustal structure, faulting and related gas venting |
publisher |
Elsevier |
publishDate |
2001 |
url |
https://oceanrep.geomar.de/id/eprint/16311/ https://oceanrep.geomar.de/id/eprint/16311/1/Riedel%20et%20al%202001.pdf https://doi.org/10.1016/s0012-821x(01)00519-2 |
genre |
Grimsey Iceland |
genre_facet |
Grimsey Iceland |
op_relation |
https://oceanrep.geomar.de/id/eprint/16311/1/Riedel%20et%20al%202001.pdf Riedel, C., Schmidt, M. , Botz, R. and Theilen, F. (2001) The Grimsey hydrothermal field offshore North Iceland: crustal structure, faulting and related gas venting. Earth and Planetary Science Letters, 193 (3-4). pp. 409-421. DOI 10.1016/s0012-821x(01)00519-2 <https://doi.org/10.1016/s0012-821x%2801%2900519-2>. doi:10.1016/s0012-821x(01)00519-2 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/s0012-821x(01)00519-2 |
container_title |
Earth and Planetary Science Letters |
container_volume |
193 |
container_issue |
3-4 |
container_start_page |
409 |
op_container_end_page |
421 |
_version_ |
1766020988968894464 |