{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360021390743190912.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2022gc010792"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2022GC010792"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Paleo‐Permeability Structure of the Crustal Section of the Samail Ophiolite Based on Automated Detection of Veins in X‐Ray CT Core Images From the Oman Drilling Project"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>To assess the paleo‐permeability structure of oceanic crust, we used 3‐D X‐ray Computed Tomography (XCT) images to quantify the distribution and geometry of mineral veins in core samples from Oman Drilling Project Holes GT1A, GT2A, and GT3A, which correspond to the upper to lower crustal sections of the Samail ophiolite. We developed a new method that automatically detects veins in the XCT core images based on iterative adaption of the two‐step Hough transform combined with multiscale Hessian filtering for identifying an elongate structure. Application of the developed method allowed us to identify the geometry and Computed Tomography number of more than 1500 veins with millimeter‐scale apertures in core sections with a total length of ∼1,200 m. High‐CT (HCT) veins in the drilled cores can be related to relatively high‐temperature fluid circulation near the mid‐ocean ridge, whereas Low‐CT (LCT) veins can be related to subsequent low‐temperature fluid circulation. Applying fracture fluid‐flow models to the geometric information for the detected veins, we found that the HCT and LCT vein systems both yielded bulk permeability of 10<jats:sup>−13</jats:sup>–10<jats:sup>−9</jats:sup> m<jats:sup>2</jats:sup> for each hole. This indicates that millimeter‐wide fractures can control crustal‐scale permeability, even in the lower oceanic crust. However, these vein systems show different depth dependencies and anisotropies of permeability, possibly reflecting the different spatial variations of high‐ and low‐temperature fluid circulation in oceanic crust.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021390743190916","@type":"Researcher","foaf:name":[{"@value":"Y. Akamatsu"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Planetary Systems Science Hiroshima University  Higashi‐Hiroshima Japan"},{"@value":"Now at Research Institute for Marine Geodynamics JAMSTEC  Kanagawa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390743190915","@type":"Researcher","foaf:name":[{"@value":"I. Katayama"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Planetary Systems Science Hiroshima University  Higashi‐Hiroshima Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390743190914","@type":"Researcher","foaf:name":[{"@value":"K. Okazaki"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Planetary Systems Science Hiroshima University  Higashi‐Hiroshima Japan"},{"@value":"Kochi Institute for Core Sample Research, X‐star JAMSTEC  Kochi Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390743190913","@type":"Researcher","foaf:name":[{"@value":"K. Michibayashi"}],"jpcoar:affiliationName":[{"@value":"Department of Earth and Planetary Sciences Graduate School of Environmental Studies Nagoya University  Nagoya Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"15252027"},{"@type":"EISSN","@value":"15252027"}],"prism:publicationName":[{"@value":"Geochemistry, Geophysics, Geosystems"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2023-06","prism:volume":"24","prism:number":"6"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://creativecommons.org/licenses/by/4.0/"],"url":[{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2022GC010792"}],"createdAt":"2023-06-22","modifiedAt":"2024-05-14","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=X%E2%80%90ray%20computed%20tomography","dc:title":"X‐ray computed tomography"},{"@id":"https://cir.nii.ac.jp/all?q=QE1-996.5","dc:title":"QE1-996.5"},{"@id":"https://cir.nii.ac.jp/all?q=QC801-809","dc:title":"QC801-809"},{"@id":"https://cir.nii.ac.jp/all?q=Geophysics.%20Cosmic%20physics","dc:title":"Geophysics. Cosmic physics"},{"@id":"https://cir.nii.ac.jp/all?q=hydrothermal%20circulation","dc:title":"hydrothermal circulation"},{"@id":"https://cir.nii.ac.jp/all?q=oceanic%20crust","dc:title":"oceanic crust"},{"@id":"https://cir.nii.ac.jp/all?q=Geology","dc:title":"Geology"},{"@id":"https://cir.nii.ac.jp/all?q=permeability","dc:title":"permeability"},{"@id":"https://cir.nii.ac.jp/all?q=image%20processing","dc:title":"image processing"},{"@id":"https://cir.nii.ac.jp/all?q=Oman%20Drilling%20Project","dc:title":"Oman Drilling Project"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040008389833171968","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21H05201"},{"@type":"JGN","@value":"JP21H05201"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-21H05201/"}],"notation":[{"@language":"ja","@value":"Slow-to-Fast現象の物理化学プロセス解明"},{"@language":"en","@value":"Physicochemical processes in slow-to-fast phenomena"}]},{"@id":"https://cir.nii.ac.jp/crid/1040566775670983296","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20H00200"},{"@type":"JGN","@value":"JP20H00200"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H00200/"}],"notation":[{"@language":"ja","@value":"プレートテクトニクスを始める力学条件の新展開"},{"@language":"en","@value":"New approach for the mechanical properties and initiation of plate 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