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Fold-Axis Parallel Extension along the Southern Ending of the Quito (Ecuadorian Andes) Fault System: Implications in River Network and Aquifer Geometry

dc.contributor.authorPeñafiel L.A.
dc.contributor.authorReyes P.S.B.
dc.contributor.authorAlcalá F.J.
dc.contributor.authorRamírez M.R.
dc.contributor.authorCabero A.
dc.date.accessioned2020-09-02T22:25:50Z
dc.date.available2020-09-02T22:25:50Z
dc.date.issued2020
dc.identifier10.1134/S0016852120020090
dc.identifier.citation54, 2, 256-265
dc.identifier.issn00168521
dc.identifier.urihttps://hdl.handle.net/20.500.12728/5799
dc.descriptionAbstract: Extension parallel to fold axis represents a rarely documented tectonic process that occur in different tectonic settings such as large-scale orogenic belts, mountain ranges, and thrust and fold belts. Along the Ecuadorian Andes, extensional systems have only been reported as tectonic boundaries of local intermontane basins, pull-apart depressions and outer-arc stretching faults along hinge surfaces in compressional antiforms. The Quito fault system shows in planform view a right-stepping en-echelon arrangement which southernmost anticlinal ridge terminates as an arcuate structure locally dissected by the Saguanchi Gorge. Valley hillslopes of this transverse drainage display evidence of tectonic extension featured by several swarms of normal faults commonly dipping towards the valley bottom. Magnetotellurics sounding obtained across a N‒S line parallel to the crestline axis reveals three contiguous and distinguishable domains of which the central one shows a wedge-shaped geometry pointing down. This tectonic evidence for ongoing extensional deformation suggests that the process of fold-axis-parallel extension controlled the tectonic development and dissection of the Saguanchi Gorge across the anticlinal ridge. This episode marks a significant change in the groundwater recharge and aquifer storage conditions between the Quito basin and the inter-Andean Depression aquifer systems, currently in production to provide the potable water supply for the Quito city. © 2020, Pleiades Publishing, Inc.
dc.language.isoen
dc.publisherPleiades Publishing
dc.subjectEcuador
dc.subjectfold-axis parallel extension
dc.subjectQuito fault system
dc.subjectthe aquifer geometry
dc.subjectaquifer
dc.subjectcrustal deformation
dc.subjectextensional tectonics
dc.subjectfold and thrust belt
dc.subjectgeometry
dc.subjectnormal fault
dc.subjectriver system
dc.subjecttectonic setting
dc.subjectAndes
dc.subjectEcuador
dc.subjectPichincha
dc.subjectQuito
dc.titleFold-Axis Parallel Extension along the Southern Ending of the Quito (Ecuadorian Andes) Fault System: Implications in River Network and Aquifer Geometry
dc.typeArticle


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