Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough
Gas emissions from the seabed are favored by tectonically active settings and their distribution is often linked to the nearby faults. Here we use the multi-beam echo-sounder (MBES) and the multi-channel seismic (MCS) data and a sediment core to show multiple gas emissions near the fault complex out...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-03-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.557634/full |
| _version_ | 1818368875690983424 |
|---|---|
| author | Ang Li Ang Li Feng Cai Feng Cai Nengyou Wu Nengyou Wu Qing Li Qing Li Guijing Yan Guijing Yan Yunbao Sun Yunbao Sun Gang Dong Gang Dong Di Luo Di Luo Xingxing Wang Xingxing Wang |
| author_facet | Ang Li Ang Li Feng Cai Feng Cai Nengyou Wu Nengyou Wu Qing Li Qing Li Guijing Yan Guijing Yan Yunbao Sun Yunbao Sun Gang Dong Gang Dong Di Luo Di Luo Xingxing Wang Xingxing Wang |
| author_sort | Ang Li |
| collection | DOAJ |
| description | Gas emissions from the seabed are favored by tectonically active settings and their distribution is often linked to the nearby faults. Here we use the multi-beam echo-sounder (MBES) and the multi-channel seismic (MCS) data and a sediment core to show multiple gas emissions near the fault complex out of the shelf of the Mid-Okinawa Trough. The features indicating the gas emissions include 1) a set of the conical positive reliefs at the seabed, 2) the bundle-shaped clusters of the high-backscattering intensities in the water column, and 3) the sub-circular medium-to high-backscattering patches at the level of the seabed. These features together show that the free gases can escape from the marine sediments then rise in the water column at present, while some other gases trapped in the sub-seafloor sediment might contribute to the precipitation of the authigenic carbonates in the past. The spatial relationship between the gas emissions and the faults suggests that the faulting driven by the back-arc extension should provide the permeable migration pathways for the gas emissions to operate, and thus determines where most of them could potentially occur. The area surrounding the restraining bend concentrates part of the gas emissions rather than along the fault lines, due to the lateral compression and the structural complexity. This is demonstrated by the results of the numerical model of finite element method (FEM), which shows two gas emissions are within the compressed zone of the modeled restraining step-over. This study provides new evidence of the role of the tectonic stresses in determining the sites of degassing of marine sediments. |
| first_indexed | 2024-12-13T23:14:54Z |
| format | Article |
| id | doaj.art-4192205c86ff47bbaacd33c044b31f29 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-13T23:14:54Z |
| publishDate | 2021-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-4192205c86ff47bbaacd33c044b31f292022-12-21T23:27:58ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-03-01910.3389/feart.2021.557634557634Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa TroughAng Li0Ang Li1Feng Cai2Feng Cai3Nengyou Wu4Nengyou Wu5Qing Li6Qing Li7Guijing Yan8Guijing Yan9Yunbao Sun10Yunbao Sun11Gang Dong12Gang Dong13Di Luo14Di Luo15Xingxing Wang16Xingxing Wang17Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaKey Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaGas emissions from the seabed are favored by tectonically active settings and their distribution is often linked to the nearby faults. Here we use the multi-beam echo-sounder (MBES) and the multi-channel seismic (MCS) data and a sediment core to show multiple gas emissions near the fault complex out of the shelf of the Mid-Okinawa Trough. The features indicating the gas emissions include 1) a set of the conical positive reliefs at the seabed, 2) the bundle-shaped clusters of the high-backscattering intensities in the water column, and 3) the sub-circular medium-to high-backscattering patches at the level of the seabed. These features together show that the free gases can escape from the marine sediments then rise in the water column at present, while some other gases trapped in the sub-seafloor sediment might contribute to the precipitation of the authigenic carbonates in the past. The spatial relationship between the gas emissions and the faults suggests that the faulting driven by the back-arc extension should provide the permeable migration pathways for the gas emissions to operate, and thus determines where most of them could potentially occur. The area surrounding the restraining bend concentrates part of the gas emissions rather than along the fault lines, due to the lateral compression and the structural complexity. This is demonstrated by the results of the numerical model of finite element method (FEM), which shows two gas emissions are within the compressed zone of the modeled restraining step-over. This study provides new evidence of the role of the tectonic stresses in determining the sites of degassing of marine sediments.https://www.frontiersin.org/articles/10.3389/feart.2021.557634/fullgas emissiongas plumemulti-beam echo-sounderOkinawa troughtranstension |
| spellingShingle | Ang Li Ang Li Feng Cai Feng Cai Nengyou Wu Nengyou Wu Qing Li Qing Li Guijing Yan Guijing Yan Yunbao Sun Yunbao Sun Gang Dong Gang Dong Di Luo Di Luo Xingxing Wang Xingxing Wang Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough Frontiers in Earth Science gas emission gas plume multi-beam echo-sounder Okinawa trough transtension |
| title | Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough |
| title_full | Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough |
| title_fullStr | Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough |
| title_full_unstemmed | Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough |
| title_short | Gas Emissions in a Transtensile Regime Along the Western Slope of the Mid-Okinawa Trough |
| title_sort | gas emissions in a transtensile regime along the western slope of the mid okinawa trough |
| topic | gas emission gas plume multi-beam echo-sounder Okinawa trough transtension |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.557634/full |
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