Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures

Accretionary prisms commonly grow seaward, with the strata of the inner prism consisting of older, previously accreted outer prism rocks overlain by thick fore-arc basin strata. We focus on the Nankai Trough inner accretionary prism using three-dimensional (3-D) seismic data and logging data from th...

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Detalles Bibliográficos
Autores: Boston, B., Moore, Gregory F., Jurado, Maria José, Sone, Hiroki
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/129970
Acceso en línea:http://hdl.handle.net/10261/129970
Access Level:acceso abierto
Palabra clave:Accretionary prism
Nankai Trough
Kumano Basin
Inner accretionary prism
Fore-arc basin
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spelling Deformation of the Nankai Trough inner accretionary prism: The role of inherited structuresBoston, B.Moore, Gregory F.Jurado, Maria JoséSone, HirokiAccretionary prismNankai TroughKumano BasinInner accretionary prismFore-arc basinAccretionary prisms commonly grow seaward, with the strata of the inner prism consisting of older, previously accreted outer prism rocks overlain by thick fore-arc basin strata. We focus on the Nankai Trough inner accretionary prism using three-dimensional (3-D) seismic data and logging data from the Integrated Ocean Drilling Program (IODP). We update the 3-D seismic volume using well velocity data to better constrain deeper horizons. Interpretation of these horizons reveals multiple folds with axial surfaces that strike near parallel to modern outer prism thrust faults, and we interpret that these folds formed as a result of thrust faulting. Reactivation of one inner prism thrust fault continued until at least ∼0.44 Ma, after the modern fore-arc basin formed, indicating that the inner prism had continued deformation until that time. Structural restorations of these folded seismic horizons demonstrate that ∼580 m of slip occurred on this steeply dipping reactivated thrust after fore-arc basin formation. Structural interpretation and analysis of logging-while-drilling data, including borehole images, in the deep inner prism revealed intense deformation of a generally homogenous lithology characterized by bedding that dips steeply (60°–90°), intersected by faults and fractures that have a range of dips and densities. Our study of the deep Kumano Basin provides new insights into the structure of the inner prism and reveals that although the inner prism has partially preserved inherited outer prism structures, these older folds and faults are steeply rotated and cut by multiple fracture populations during subsequent deformation.Funding for this research was provided by the National Science Foundation (grant OCE-0451790) and a U.S. Science Support Program Post-Expedition Award.Peer reviewedAmerican Geophysical UnionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/129970reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1002/2015GC006185Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1299702026-05-22T06:33:51Z
dc.title.none.fl_str_mv Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
title Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
spellingShingle Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
Boston, B.
Accretionary prism
Nankai Trough
Kumano Basin
Inner accretionary prism
Fore-arc basin
title_short Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
title_full Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
title_fullStr Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
title_full_unstemmed Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
title_sort Deformation of the Nankai Trough inner accretionary prism: The role of inherited structures
dc.creator.none.fl_str_mv Boston, B.
Moore, Gregory F.
Jurado, Maria José
Sone, Hiroki
author Boston, B.
author_facet Boston, B.
Moore, Gregory F.
Jurado, Maria José
Sone, Hiroki
author_role author
author2 Moore, Gregory F.
Jurado, Maria José
Sone, Hiroki
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Accretionary prism
Nankai Trough
Kumano Basin
Inner accretionary prism
Fore-arc basin
topic Accretionary prism
Nankai Trough
Kumano Basin
Inner accretionary prism
Fore-arc basin
description Accretionary prisms commonly grow seaward, with the strata of the inner prism consisting of older, previously accreted outer prism rocks overlain by thick fore-arc basin strata. We focus on the Nankai Trough inner accretionary prism using three-dimensional (3-D) seismic data and logging data from the Integrated Ocean Drilling Program (IODP). We update the 3-D seismic volume using well velocity data to better constrain deeper horizons. Interpretation of these horizons reveals multiple folds with axial surfaces that strike near parallel to modern outer prism thrust faults, and we interpret that these folds formed as a result of thrust faulting. Reactivation of one inner prism thrust fault continued until at least ∼0.44 Ma, after the modern fore-arc basin formed, indicating that the inner prism had continued deformation until that time. Structural restorations of these folded seismic horizons demonstrate that ∼580 m of slip occurred on this steeply dipping reactivated thrust after fore-arc basin formation. Structural interpretation and analysis of logging-while-drilling data, including borehole images, in the deep inner prism revealed intense deformation of a generally homogenous lithology characterized by bedding that dips steeply (60°–90°), intersected by faults and fractures that have a range of dips and densities. Our study of the deep Kumano Basin provides new insights into the structure of the inner prism and reveals that although the inner prism has partially preserved inherited outer prism structures, these older folds and faults are steeply rotated and cut by multiple fracture populations during subsequent deformation.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/129970
url http://hdl.handle.net/10261/129970
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1002/2015GC006185
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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