eprintid: 10204564 rev_number: 7 eprint_status: archive userid: 699 dir: disk0/10/20/45/64 datestamp: 2025-02-11 10:54:42 lastmod: 2025-02-11 10:54:42 status_changed: 2025-02-11 10:54:42 type: article metadata_visibility: show sword_depositor: 699 creators_name: Espinosa-Leal, J creators_name: Browning, J creators_name: Cembrano, J creators_name: Mitchell, T creators_name: Rojas, F creators_name: Moorkamp, M creators_name: Griffith, WA creators_name: Meredith, P title: Fault intersection-related stress rotation controls magma emplacement at the Nevados de Chillán Volcanic Complex ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F57 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 note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. 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. date: 2025-02-01 date_type: published publisher: ELSEVIER official_url: https://doi.org/10.1016/j.jvolgeores.2024.108255 full_text_type: other language: eng verified: verified_manual elements_id: 2343737 doi: 10.1016/j.jvolgeores.2024.108255 lyricists_name: Mitchell, Thomas lyricists_name: Meredith, Philip lyricists_id: TMITC07 lyricists_id: PGMER52 actors_name: Mitchell, Thomas actors_id: TMITC07 actors_role: owner funding_acknowledgements: 1210591 [FONDECYT]; 15090013 [FONDAP]; 21212164 [ANID - National Doctoral Scholarship]; 14068 [Petex MOVE software] full_text_status: restricted publication: Journal of Volcanology and Geothermal Research volume: 458 article_number: 108255 pages: 16 issn: 0377-0273 citation: Espinosa-Leal, J; Browning, J; Cembrano, J; Mitchell, T; Rojas, F; Moorkamp, M; Griffith, WA; Espinosa-Leal, J; Browning, J; Cembrano, J; Mitchell, T; Rojas, F; Moorkamp, M; Griffith, WA; Meredith, P; - view fewer <#> (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 <https://doi.org/10.1016/j.jvolgeores.2024.108255>. document_url: https://discovery.ucl.ac.uk/id/eprint/10204564/1/Espinosa-Leal%20et%20al_JVGR%20-%20no%20changes%20shown.pdf