In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008
At Integrated Ocean Drilling Program (IODP) Site C0008 in the Nankai Trough slope sediment, we discovered in situ temperature anomalies at 80 to 160 m below the seafloor, where pore fluid Cl and δ 18O excursions were identified and interpreted as pore fluid refreshing due to hydrate dissociation. Th...
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ftunivryukyus:oai:u-ryukyu.repo.nii.ac.jp:02008847 2023-08-27T04:10:34+02:00 In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 Kinoshita, Masataka Fukase, Hiroaki Goto, Shusaku Toki, Tomohiro 2015-02-05 https://hdl.handle.net/20.500.12000/37646 eng eng Springer https://doi.org/10.1186/s40623-014-0171-1 doi:10.1186/s40623-014-0171-1 http://hdl.handle.net/20.500.12000/37646 1880-5981 Earth, Planets and Space 16 67 9 1 open access NanTroSEIZE Methane hydrate Endothermic Friction VoR 2015 ftunivryukyus https://doi.org/20.500.12000/3764610.1186/s40623-014-0171-1 2023-08-04T00:05:34Z At Integrated Ocean Drilling Program (IODP) Site C0008 in the Nankai Trough slope sediment, we discovered in situ temperature anomalies at 80 to 160 m below the seafloor, where pore fluid Cl and δ 18O excursions were identified and interpreted as pore fluid refreshing due to hydrate dissociation. The volume fraction of hydrates is estimated to be approximately 3% and approximately 40% maximum at Holes C0008A and C0008C, respectively. In the vicinity of these anomalies, we discovered negative and positive temperature excursions of up to 1 K measured in situ using the Advanced Piston Corer Temperature (APC-T) tool attached to the shoe of a hydraulic piston corer. They are significantly larger than the uncertainties caused during data acquisition and processing. Frictional heat due to penetration increased the temperature by >10 K, exceeding the gas/hydrate stability temperature at that depth. This heat is partly consumed by hydrate dissociation, which disturbs the thermal decay curve after penetration, but 2D numerical modeling revealed that hydrate dissociation does not significantly change the extrapolated equilibrium temperature. So far, we cannot suggest any acceptable explanation for the observed thermal anomalies, although we strongly suspect that it is related to hydrate dissociation. 論文 http://purl.org/coar/resource_type/c_6501 Other/Unknown Material Methane hydrate University of the Ryukyus Repository (UR) Earth, Planets and Space 67 1 16 |
institution |
Open Polar |
collection |
University of the Ryukyus Repository (UR) |
op_collection_id |
ftunivryukyus |
language |
English |
topic |
NanTroSEIZE Methane hydrate Endothermic Friction |
spellingShingle |
NanTroSEIZE Methane hydrate Endothermic Friction Kinoshita, Masataka Fukase, Hiroaki Goto, Shusaku Toki, Tomohiro In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 |
topic_facet |
NanTroSEIZE Methane hydrate Endothermic Friction |
description |
At Integrated Ocean Drilling Program (IODP) Site C0008 in the Nankai Trough slope sediment, we discovered in situ temperature anomalies at 80 to 160 m below the seafloor, where pore fluid Cl and δ 18O excursions were identified and interpreted as pore fluid refreshing due to hydrate dissociation. The volume fraction of hydrates is estimated to be approximately 3% and approximately 40% maximum at Holes C0008A and C0008C, respectively. In the vicinity of these anomalies, we discovered negative and positive temperature excursions of up to 1 K measured in situ using the Advanced Piston Corer Temperature (APC-T) tool attached to the shoe of a hydraulic piston corer. They are significantly larger than the uncertainties caused during data acquisition and processing. Frictional heat due to penetration increased the temperature by >10 K, exceeding the gas/hydrate stability temperature at that depth. This heat is partly consumed by hydrate dissociation, which disturbs the thermal decay curve after penetration, but 2D numerical modeling revealed that hydrate dissociation does not significantly change the extrapolated equilibrium temperature. So far, we cannot suggest any acceptable explanation for the observed thermal anomalies, although we strongly suspect that it is related to hydrate dissociation. 論文 http://purl.org/coar/resource_type/c_6501 |
format |
Other/Unknown Material |
author |
Kinoshita, Masataka Fukase, Hiroaki Goto, Shusaku Toki, Tomohiro |
author_facet |
Kinoshita, Masataka Fukase, Hiroaki Goto, Shusaku Toki, Tomohiro |
author_sort |
Kinoshita, Masataka |
title |
In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 |
title_short |
In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 |
title_full |
In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 |
title_fullStr |
In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 |
title_full_unstemmed |
In situ thermal excursions detected in the Nankai Trough forearc slope sediment at IODP NanTroSEIZE Site C0008 |
title_sort |
in situ thermal excursions detected in the nankai trough forearc slope sediment at iodp nantroseize site c0008 |
publisher |
Springer |
publishDate |
2015 |
url |
https://hdl.handle.net/20.500.12000/37646 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://doi.org/10.1186/s40623-014-0171-1 doi:10.1186/s40623-014-0171-1 http://hdl.handle.net/20.500.12000/37646 1880-5981 Earth, Planets and Space 16 67 9 1 |
op_rights |
open access |
op_doi |
https://doi.org/20.500.12000/3764610.1186/s40623-014-0171-1 |
container_title |
Earth, Planets and Space |
container_volume |
67 |
container_issue |
1 |
container_start_page |
16 |
_version_ |
1775352703117950976 |