Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings
Abstract We conducted magnetotelluric measurements to investigate a large serpentinite complex in the northern Kamuikotan Zone that intruded a Cretaceous–Paleocene forearc sedimentary sequence. The resistivity model we derived by three-dimensional inversion clearly shows a low-resistivity zone benea...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-07-01
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| Series: | Earth, Planets and Space |
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| Online Access: | https://doi.org/10.1186/s40623-021-01482-5 |
| _version_ | 1818909171933773824 |
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| author | Hiroshi Ichihara Toru Mogi Toshihiro Uchida Hideyuki Satoh Yusuke Yamaya Masakazu Fujii Shusaku Yamazaki Kenji Okazaki Noriko Tada |
| author_facet | Hiroshi Ichihara Toru Mogi Toshihiro Uchida Hideyuki Satoh Yusuke Yamaya Masakazu Fujii Shusaku Yamazaki Kenji Okazaki Noriko Tada |
| author_sort | Hiroshi Ichihara |
| collection | DOAJ |
| description | Abstract We conducted magnetotelluric measurements to investigate a large serpentinite complex in the northern Kamuikotan Zone that intruded a Cretaceous–Paleocene forearc sedimentary sequence. The resistivity model we derived by three-dimensional inversion clearly shows a low-resistivity zone beneath the outcrop of the serpentinite complex. We interpret the low-resistivity zone to represent aqueous pore fluid within a serpentinite mélange derived from the subducting Pacific plate or mantle wedge. Previous geological studies in the area have shown that the serpentinite mélange had uplifted during the early Pleistocene. They indicate that the ultramafic rocks and aqueous fluids have continued to rise in the area. The uplifting serpentinite body might have formed a zone enriched in pore fluid that promoted the occurrence of a previously identified intra-plate slow slip event. These results demonstrate the important role of fluid transport during tectonic processes related to uplift in subduction zones. |
| first_indexed | 2024-12-19T22:22:41Z |
| format | Article |
| id | doaj.art-3eef2f942d5a4b0e815fc8f9d606e0b8 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-19T22:22:41Z |
| publishDate | 2021-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-3eef2f942d5a4b0e815fc8f9d606e0b82022-12-21T20:03:35ZengSpringerOpenEarth, Planets and Space1880-59812021-07-0173111110.1186/s40623-021-01482-5Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundingsHiroshi Ichihara0Toru Mogi1Toshihiro Uchida2Hideyuki Satoh3Yusuke Yamaya4Masakazu Fujii5Shusaku Yamazaki6Kenji Okazaki7Noriko Tada8Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya UniversityEarthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya UniversityThe Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido UniversityRenewable Energy Research Center, National Institute of Advanced Industrial Science and Technology (AIST)National Institute of Polar ResearchCivil Engineering Research Institute for Cold RegionCivil Engineering Research Institute for Cold RegionResearch Institute for Marine Geodynamics, Japan Agency for Marin-Earth Science and TechnologyAbstract We conducted magnetotelluric measurements to investigate a large serpentinite complex in the northern Kamuikotan Zone that intruded a Cretaceous–Paleocene forearc sedimentary sequence. The resistivity model we derived by three-dimensional inversion clearly shows a low-resistivity zone beneath the outcrop of the serpentinite complex. We interpret the low-resistivity zone to represent aqueous pore fluid within a serpentinite mélange derived from the subducting Pacific plate or mantle wedge. Previous geological studies in the area have shown that the serpentinite mélange had uplifted during the early Pleistocene. They indicate that the ultramafic rocks and aqueous fluids have continued to rise in the area. The uplifting serpentinite body might have formed a zone enriched in pore fluid that promoted the occurrence of a previously identified intra-plate slow slip event. These results demonstrate the important role of fluid transport during tectonic processes related to uplift in subduction zones.https://doi.org/10.1186/s40623-021-01482-5Magnetotelluric methodElectrical conductivityResistivitySerpentiniteSlow earthquakeSlow slip |
| spellingShingle | Hiroshi Ichihara Toru Mogi Toshihiro Uchida Hideyuki Satoh Yusuke Yamaya Masakazu Fujii Shusaku Yamazaki Kenji Okazaki Noriko Tada Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings Earth, Planets and Space Magnetotelluric method Electrical conductivity Resistivity Serpentinite Slow earthquake Slow slip |
| title | Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings |
| title_full | Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings |
| title_fullStr | Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings |
| title_full_unstemmed | Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings |
| title_short | Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings |
| title_sort | imaging of a serpentinite complex in the kamuikotan zone northern japan from magnetotelluric soundings |
| topic | Magnetotelluric method Electrical conductivity Resistivity Serpentinite Slow earthquake Slow slip |
| url | https://doi.org/10.1186/s40623-021-01482-5 |
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