Espinosa-Leal, J;
Browning, J;
Cembrano, J;
Mitchell, T;
Rojas, F;
Moorkamp, M;
Griffith, WA;
(2025)
Fault intersection-related stress rotation controls magma emplacement at the Nevados de Chillán Volcanic Complex.
Journal of Volcanology and Geothermal Research
, 458
, Article 108255. 10.1016/j.jvolgeores.2024.108255.
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Espinosa-Leal et al_JVGR - no changes shown.pdf - Accepted Version Access restricted to UCL open access staff until 12 December 2025. Download (6MB) |
Abstract
It 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.
| Type: | Article |
|---|---|
| Title: | Fault intersection-related stress rotation controls magma emplacement at the Nevados de Chillán Volcanic Complex |
| DOI: | 10.1016/j.jvolgeores.2024.108255 |
| Publisher version: | https://doi.org/10.1016/j.jvolgeores.2024.108255 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, Fault intersections, Volcanic complex, Stress fields, UAV, Magma emplacement, STRIKE-SLIP, STRUCTURAL CONTROL, SEISMIC ACTIVITY, CHILEAN ANDES, CORDON-CAULLE, ZONE, EARTHQUAKE, TECTONICS, EVOLUTION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204564 |
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