Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand
The Pāpaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of the Hikurangi Margin. In logging‐while‐drilling data, the 33‐m‐thick fault zone exhibits mixed modes of deformation associated with a trend of down...
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Online Access: | http://hdl.handle.net/10044/1/83011 https://doi.org/10.1029/2020gl088474 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/83011 2023-05-15T17:12:00+02:00 Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand Cook, AE Paganoni, M Clennell, MB McNamara, DD Nole, M Wang, X Han, S Bell, RE Solomon, EA Saffer, DM Barnes, PM Pecher, IA Wallace, LM LeVay, LJ Petronotis, KE Natural Environment Research Council 2006-2012 2020-07-29 http://hdl.handle.net/10044/1/83011 https://doi.org/10.1029/2020gl088474 en eng American Geophysical Union (AGU) Geophysical Research Letters 0094-8276 http://hdl.handle.net/10044/1/83011 doi:10.1029/2020gl088474 NE/S00291X/1 ©2020. American Geophysical Union. All Rights Reserved. This is the accepted version of the following article: Cook, A. E., Paganoni, M., Clennell, M. B., McNamara, D. D., Nole, M., Wang, X., et al. (2020). Physical properties and gas hydrate at a near‐seafloor thrust fault, Hikurangi Margin, New Zealand. Geophysical Research Letters, 47, e2020GL088474, which has been published in final form at https://doi.org/10.1029/2020GL088474 11 1 Meteorology & Atmospheric Sciences Journal Article 2020 ftimperialcol https://doi.org/10.1029/2020gl088474 2020-10-08T22:38:20Z The Pāpaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of the Hikurangi Margin. In logging‐while‐drilling data, the 33‐m‐thick fault zone exhibits mixed modes of deformation associated with a trend of downward decreasing density, P‐wave velocity, and resistivity. Methane hydrate is observed from ~30 to 585 m below seafloor (mbsf), including within and surrounding the fault zone. Hydrate accumulations are vertically discontinuous and occur throughout the entire logged section at low to moderate saturation in silty and sandy centimeter‐thick layers. We argue that the hydrate distribution implies that the methane is not sourced from fluid flow along the fault but instead by local diffusion. This, combined with geophysical observations and geochemical measurements from Site U1518, suggests that the fault is not a focused migration pathway for deeply sourced fluids and that the near‐seafloor Pāpaku Fault Zone has little to no active fluid flow. Article in Journal/Newspaper Methane hydrate Imperial College London: Spiral New Zealand Geophysical Research Letters 47 16 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
English |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Cook, AE Paganoni, M Clennell, MB McNamara, DD Nole, M Wang, X Han, S Bell, RE Solomon, EA Saffer, DM Barnes, PM Pecher, IA Wallace, LM LeVay, LJ Petronotis, KE Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
The Pāpaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of the Hikurangi Margin. In logging‐while‐drilling data, the 33‐m‐thick fault zone exhibits mixed modes of deformation associated with a trend of downward decreasing density, P‐wave velocity, and resistivity. Methane hydrate is observed from ~30 to 585 m below seafloor (mbsf), including within and surrounding the fault zone. Hydrate accumulations are vertically discontinuous and occur throughout the entire logged section at low to moderate saturation in silty and sandy centimeter‐thick layers. We argue that the hydrate distribution implies that the methane is not sourced from fluid flow along the fault but instead by local diffusion. This, combined with geophysical observations and geochemical measurements from Site U1518, suggests that the fault is not a focused migration pathway for deeply sourced fluids and that the near‐seafloor Pāpaku Fault Zone has little to no active fluid flow. |
author2 |
Natural Environment Research Council 2006-2012 |
format |
Article in Journal/Newspaper |
author |
Cook, AE Paganoni, M Clennell, MB McNamara, DD Nole, M Wang, X Han, S Bell, RE Solomon, EA Saffer, DM Barnes, PM Pecher, IA Wallace, LM LeVay, LJ Petronotis, KE |
author_facet |
Cook, AE Paganoni, M Clennell, MB McNamara, DD Nole, M Wang, X Han, S Bell, RE Solomon, EA Saffer, DM Barnes, PM Pecher, IA Wallace, LM LeVay, LJ Petronotis, KE |
author_sort |
Cook, AE |
title |
Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand |
title_short |
Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand |
title_full |
Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand |
title_fullStr |
Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand |
title_full_unstemmed |
Physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, New Zealand |
title_sort |
physical properties and gas hydrate at a near‐seafloor thrust fault, hikurangi margin, new zealand |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
http://hdl.handle.net/10044/1/83011 https://doi.org/10.1029/2020gl088474 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
11 1 |
op_relation |
Geophysical Research Letters 0094-8276 http://hdl.handle.net/10044/1/83011 doi:10.1029/2020gl088474 NE/S00291X/1 |
op_rights |
©2020. American Geophysical Union. All Rights Reserved. This is the accepted version of the following article: Cook, A. E., Paganoni, M., Clennell, M. B., McNamara, D. D., Nole, M., Wang, X., et al. (2020). Physical properties and gas hydrate at a near‐seafloor thrust fault, Hikurangi Margin, New Zealand. Geophysical Research Letters, 47, e2020GL088474, which has been published in final form at https://doi.org/10.1029/2020GL088474 |
op_doi |
https://doi.org/10.1029/2020gl088474 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
16 |
_version_ |
1766068749828358144 |