Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications
Methane gas hydrates in marine sediments often concentrate in coarse-grained layers surrounded by fine-grained marine muds that are hydrate-free. Methane in these hydrate deposits is typically microbial, and must have migrated from its source as the coarse-grained sediments contain little or no orga...
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ftoceanrep:oai:oceanrep.geomar.de:47999 2023-05-15T17:12:10+02:00 Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications Malinverno, Alberto Goldberg, David S. 2015 text https://oceanrep.geomar.de/id/eprint/47999/ https://oceanrep.geomar.de/id/eprint/47999/1/Malinverno%20et%20al.pdf https://doi.org/10.1016/j.epsl.2015.04.019 en eng Elsevier https://oceanrep.geomar.de/id/eprint/47999/1/Malinverno%20et%20al.pdf Malinverno, A. and Goldberg, D. S. (2015) Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications. Earth and Planetary Science Letters, 422 . pp. 105-114. DOI 10.1016/j.epsl.2015.04.019 <https://doi.org/10.1016/j.epsl.2015.04.019>. doi:10.1016/j.epsl.2015.04.019 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2015 ftoceanrep https://doi.org/10.1016/j.epsl.2015.04.019 2023-04-07T15:47:44Z Methane gas hydrates in marine sediments often concentrate in coarse-grained layers surrounded by fine-grained marine muds that are hydrate-free. Methane in these hydrate deposits is typically microbial, and must have migrated from its source as the coarse-grained sediments contain little or no organic matter. In “long-range” migration, fluid flow through permeable layers transports methane from deeper sources into the gas hydrate stability zone (GHSZ). In “short-range” migration, microbial methane is generated within the GHSZ in fine-grained sediments, where small pore sizes inhibit hydrate formation. Dissolved methane can then diffuse into adjacent sand layers, where pore size does not restrict hydrate formation and hydrates can accumulate. Short-range migration has been used to explain hydrate accumulations in sand layers observed in drill sites on the northern Cascadia margin and in the Gulf of Mexico. Here we test the feasibility of short-range migration in two additional locations, where gas hydrates have been found in coarse-grained volcanic ash layers (Site NGHP-01-17, Andaman Sea, Indian Ocean) and turbidite sand beds (Site IODP-C0002, Kumano forearc basin, Nankai Trough, western Pacific). We apply reaction–transport modeling to calculate dissolved methane concentration and gas hydrate amounts resulting from microbial methane generated within the GHSZ. Model results show that short-range migration of microbial methane can explain the overall amounts of methane hydrate observed at the two sites. Short-range migration has been shown to be feasible in diverse margin environments and is likely to be a widespread methane transport mechanism in gas hydrate systems. It only requires a small amount of organic carbon and sediment sequences consisting of thin coarse-grained layers that can concentrate microbial methane generated within thick fine-grained sediment beds; these conditions are common along continental margins around the globe. Article in Journal/Newspaper Methane hydrate OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Indian Pacific Earth and Planetary Science Letters 422 105 114 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Methane gas hydrates in marine sediments often concentrate in coarse-grained layers surrounded by fine-grained marine muds that are hydrate-free. Methane in these hydrate deposits is typically microbial, and must have migrated from its source as the coarse-grained sediments contain little or no organic matter. In “long-range” migration, fluid flow through permeable layers transports methane from deeper sources into the gas hydrate stability zone (GHSZ). In “short-range” migration, microbial methane is generated within the GHSZ in fine-grained sediments, where small pore sizes inhibit hydrate formation. Dissolved methane can then diffuse into adjacent sand layers, where pore size does not restrict hydrate formation and hydrates can accumulate. Short-range migration has been used to explain hydrate accumulations in sand layers observed in drill sites on the northern Cascadia margin and in the Gulf of Mexico. Here we test the feasibility of short-range migration in two additional locations, where gas hydrates have been found in coarse-grained volcanic ash layers (Site NGHP-01-17, Andaman Sea, Indian Ocean) and turbidite sand beds (Site IODP-C0002, Kumano forearc basin, Nankai Trough, western Pacific). We apply reaction–transport modeling to calculate dissolved methane concentration and gas hydrate amounts resulting from microbial methane generated within the GHSZ. Model results show that short-range migration of microbial methane can explain the overall amounts of methane hydrate observed at the two sites. Short-range migration has been shown to be feasible in diverse margin environments and is likely to be a widespread methane transport mechanism in gas hydrate systems. It only requires a small amount of organic carbon and sediment sequences consisting of thin coarse-grained layers that can concentrate microbial methane generated within thick fine-grained sediment beds; these conditions are common along continental margins around the globe. |
format |
Article in Journal/Newspaper |
author |
Malinverno, Alberto Goldberg, David S. |
spellingShingle |
Malinverno, Alberto Goldberg, David S. Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications |
author_facet |
Malinverno, Alberto Goldberg, David S. |
author_sort |
Malinverno, Alberto |
title |
Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications |
title_short |
Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications |
title_full |
Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications |
title_fullStr |
Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications |
title_full_unstemmed |
Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications |
title_sort |
testing short-range migration of microbial methane as a hydrate formation mechanism: results from andaman sea and kumano basin drill sites and global implications |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://oceanrep.geomar.de/id/eprint/47999/ https://oceanrep.geomar.de/id/eprint/47999/1/Malinverno%20et%20al.pdf https://doi.org/10.1016/j.epsl.2015.04.019 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://oceanrep.geomar.de/id/eprint/47999/1/Malinverno%20et%20al.pdf Malinverno, A. and Goldberg, D. S. (2015) Testing short-range migration of microbial methane as a hydrate formation mechanism: Results from Andaman Sea and Kumano Basin drill sites and global implications. Earth and Planetary Science Letters, 422 . pp. 105-114. DOI 10.1016/j.epsl.2015.04.019 <https://doi.org/10.1016/j.epsl.2015.04.019>. doi:10.1016/j.epsl.2015.04.019 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2015.04.019 |
container_title |
Earth and Planetary Science Letters |
container_volume |
422 |
container_start_page |
105 |
op_container_end_page |
114 |
_version_ |
1766068962997567488 |