Quantitative anisotropies of palaeopermeability in a strike-slip fault damage zone: Insights from micro-CT analysis and numerical simulations

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dc.contributor.authorGomila R.
dc.contributor.authorArancibia G.
dc.contributor.authorCembrano J.
dc.contributor.authorGomila R.
dc.contributor.authorArancibia G.
dc.contributor.authorMorata D.
dc.contributor.authorCembrano J.
dc.contributor.authorGomila R.
dc.contributor.authorNehler M.
dc.contributor.authorBracke R.
dc.contributor.authorMorata D.
dc.date.accessioned2024-01-10T13:44:35Z
dc.date.available2024-01-10T13:44:35Z
dc.date.issued2021
dc.description.abstract© 2021 Elsevier B.V.Fracturing and damage around faults related to seismogenesis can enhance hydrothermal fluid percolation, causing mineral precipitation. This study uses hydrothermally sealed microfractures across an ancient exhumed fault to unravel the 3D-spatial distribution of fault damage and related anisotropy in permeability. We studied the fault damage zone of the Jorgillo Fault, a left-lateral strike-slip fault, exposed by ca. 20 km in the Atacama Fault System, northern Chile. The study was conducted by addressing the 3D-spatial distribution of the microfracture network through X-ray micro-computed tomography and palaeopermeability modeling using a computational fluid dynamic approach, thus assessing mm-scale fault-related permeability tensors. 3D modeled fault-directed permeability ellipsoids on both sides of the fault core are transverse anisotropic, where palaeopermeability (matrix permeability) in the fault-parallel plane is higher than across-strike of the Jorgillo Fault (2.4 and 1.9 times in the eastern and western block of the fault, respectively). Modeled 3D permeability values (ca. 10−11 to 10−15 m2) show a mean overestimation factor of 8.4 of the estimated 2D permeability (ca. 10−9 to 10−12 m2). Permeability anisotropy distribution in the damage zone is related to off-fault damage generation, and could be explained by tip propagation fault growth and dynamic rupture due to earthquakes under the fault-valve mechanism. Whereas the fault would act as an impermeable seal except for post-failure, when it became highly permeable for fluids.
dc.description.funderCONICYT-BMBF
dc.description.funderMSCA-IF FRICTION
dc.description.funderVRI
dc.description.funderPUC
dc.description.funderCONICYT
dc.description.funderFONDAP
dc.fechaingreso.objetodigital11-04-2024
dc.fuente.origenScopus
dc.identifier.doi10.1016/j.tecto.2021.228873
dc.identifier.issn00401951
dc.identifier.scopusidSCOPUS_ID:85108296380
dc.identifier.urihttps://doi.org/10.1016/j.tecto.2021.228873
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78916
dc.identifier.wosidWOS:000674652900006
dc.information.autorucFacultad de Ingeniería; Arancibia Hernandez, Gloria Cecilia; S/I; 1008583
dc.issue.numero228873
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherElsevier B.V.
dc.revistaTectonophysics
dc.rightsacceso restringido
dc.subject3D Permeability modeling
dc.subjectFault zone palaeopermeability
dc.subjectLattice-Boltzmann method
dc.subjectPermeability anisotropy
dc.subjectX-Ray micro-computed tomography
dc.subject.ods13 Climate action
dc.subject.odspa13 Acción por el clima
dc.titleQuantitative anisotropies of palaeopermeability in a strike-slip fault damage zone: Insights from micro-CT analysis and numerical simulations
dc.typeartículo
dc.volumen810
sipa.codpersvinculados1008583
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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