Fault intersection-related stress rotation controls magma emplacement at the Nevados de Chill´ an Volcanic Complex

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dc.catalogadorjlo
dc.contributor.authorEspinosa Leal, Javier
dc.contributor.authorBrowning, John
dc.contributor.authorCembrano, José
dc.contributor.authorMitchell, Thomas
dc.contributor.authorRojas, Flavia
dc.contributor.authorMoorkamp, Max
dc.contributor.authorGriffith, W. Ashley
dc.contributor.authorMeredith, Philip
dc.date.accessioned2025-08-28T18:45:23Z
dc.date.available2025-08-28T18:45:23Z
dc.date.issued2025
dc.description.abstractIt has been suggested that fracture and fault intersections promote enhanced transport of fluids in the brittle crust by forming zones of increased permeability. However, the underlying mechanisms that control the emplacement of magma at fault intersections remain poorly understood. To better understand the relation between magma emplacement, volcano development and fault zone intersections, we examine the Nevados de Chillán Volcanic Complex (NChVC, 36.8°S) in the Southern Andean Volcanic Zone. The complex is thought to be located atop the intersection between two sets of NE-right lateral strike-slip faults and a seismically active regional scale NW-oriented inherited structure, also interpreted as a regional fault zone. We collected data on the orientation and frequency of tens of dykes and thousands of fractures, at the volcano scale, from representative outcrops using three-dimensional digital image correlation techniques, with images taken from Unmanned Aerial Vehicles (UAVs). We use these data to generate a conceptual model of the response of the different fracture sets to regional loads and the potential consequence in terms of magma emplacement. In our conceptual model, N-S to NW-SE striking fractures become reactivated by fault intersection-related local stress field rotations. This, in turn, favors NW-SE aligned magma emplacement, and the evolution of NW-SE aligned volcanoes. Our findings provide a mechanical explanation for rotated magma emplacement pathways, which do not necessarily require a transient stress state imposed by unlocking the megathrust.
dc.format.extent16 páginas
dc.fuente.origenORCID
dc.identifier.doi10.1016/j.jvolgeores.2024.108255
dc.identifier.issn0377-0273
dc.identifier.urihttps://doi.org/10.1016/j.jvolgeores.2024.108255
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/105331
dc.information.autorucEscuela de Ingeniería; Espinosa Leal, Javier Andrés; S/I; 1183136
dc.information.autorucEscuela de Ingeniería; Browning, John; 0000-0001-8022-6234; 1081089
dc.information.autorucEscuela de Ingeniería; Cembrano Perasso, José Miguel; 0000-0003-4247-8259; 1008585
dc.information.autorucEscuela de Ingeniería; Rojas Guzmán, Flavia Jael; S/I; 1049375
dc.language.isoen
dc.nota.accesocontenido parcial
dc.revistaJournal of Volcanology and Geothermal Research
dc.rightsacceso restringido
dc.subjectFault intersections
dc.subjectVolcanic complex
dc.subjectStress fields
dc.subjectMagma emplacement
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.titleFault intersection-related stress rotation controls magma emplacement at the Nevados de Chill´ an Volcanic Complex
dc.typeartículo
dc.volumen458
sipa.codpersvinculados1183136
sipa.codpersvinculados1081089
sipa.codpersvinculados1008585
sipa.codpersvinculados1049375
sipa.trazabilidadORCID;2025-08-22
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