Development of a self-similar strike-slip duplex system in the Atacama Fault system, Chile

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dc.contributor.authorJensen, E.
dc.contributor.authorCembrano, J.
dc.contributor.authorFaulkner, D.
dc.contributor.authorVeloso, E.
dc.contributor.authorArancibia, G.
dc.date.accessioned2024-01-10T13:12:18Z
dc.date.available2024-01-10T13:12:18Z
dc.date.issued2011
dc.description.abstractFault development models are crucial to predict geometry and distribution of fractures at all scales. We present here structures related to the development of the Bolfin Fault in the Atacama Fault System (AFS), covering a range of scales of 7 orders of magnitude. The AFS is a 1000 km-long trench-parallel fault system located in the Andean Forearc. The Boffin Fault is a first-order fault of the Caleta Coloso Duplex, has a trend similar to 170 degrees and length >45 km. It cuts mainly meta-diorites and exhibits a 100-200 m thick core of subvertical bands of altered fractured host rock and of foliated cataclasites. This foliation is made up of several trend-parallel cm-thick shear bands, composed of plagioclase fragments (>0.1 mm) surrounded by epidote.
dc.description.abstractIn the compressive quadrant around the tip point of Boffin Fault, the lower strain faults exhibit an unusual internal structure consisting of fractures arranged in a multi-duplex pattern. This pattern can be observed from meters to millimeters scale. The fractures in the strike-slip duplex pattern can be separated into two types. Main Faults: trend-parallel, longer and with larger offsets; and Secondary Fractures: sigmoid-shape fractures distributed in the regions between Main Faults, all oriented between 15 degrees and 75 degrees with respect to the Main Faults, measured counterclockwise (i.e. in P-diedra).
dc.description.abstractOn the basis of the distribution of the two types of recognized fractures, the relative sequence of propagation can be inferred. Main Faults, the more widely distributed, propagated earlier. The Secondary Fractures, in turn, distributed in thinner areas between the larger Main Faults, were propagated later as linking fractures.
dc.description.abstractThe duplex pattern is self-similar: Multiple-Core Faults with internal structure of multiple-duplex are itself in turn secondary faults within a larger km-scale duplex (Caleta Coloso Duplex).
dc.description.abstractThe duplex width (W) and the length (L) of the Main Faults forming the duplex show an almost linear relationship, for duplexes observed from micro- to regional scale. For a scale range of seven orders of magnitude, the length of the master strike-slip faults is about ten times the width of the overlapping duplex area. This relationship evidence the self-similar nature of the structural system under study and suggests that the same fundamental mechanical processes that build up the small strike-slip duplexes operate also at the regional scale. (C) 2011 Elsevier Ltd. All rights reserved.
dc.description.funderFONDECYT
dc.description.funderUniversidad Catolica del Norte
dc.description.funderCONICYT
dc.fechaingreso.objetodigital01-04-2024
dc.format.extent16 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jsg.2011.09.002
dc.identifier.issn0191-8141
dc.identifier.urihttps://doi.org/10.1016/j.jsg.2011.09.002
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78166
dc.identifier.wosidWOS:000296993600006
dc.information.autorucIngeniería;Arancibia G;S/I;1008583
dc.information.autorucIngeniería;Cembrano J;S/I;1008585
dc.issue.numero11
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final1626
dc.pagina.inicio1611
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.revistaJOURNAL OF STRUCTURAL GEOLOGY
dc.rightsacceso restringido
dc.subjectFault internal structure
dc.subjectStrike-slip duplex
dc.subjectSelf-similarity
dc.subjectFault development
dc.subjectFracture network
dc.subjectMOUNT ABBOT QUADRANGLE
dc.subjectMAGMATIC ARC
dc.subjectCOASTAL CORDILLERA
dc.subjectSHEAR ZONES
dc.subjectFLUID-FLOW
dc.subjectDEFORMATION
dc.subjectEVOLUTION
dc.subjectTECTONICS
dc.subjectGROWTH
dc.subjectSTRESS
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleDevelopment of a self-similar strike-slip duplex system in the Atacama Fault system, Chile
dc.typeartículo
dc.volumen33
sipa.codpersvinculados1008583
sipa.codpersvinculados1008585
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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