TY  - JOUR
KW  - Science & Technology
KW  -  Physical Sciences
KW  -  Geosciences
KW  -  Multidisciplinary
KW  -  Geology
KW  -  Fault intersections
KW  -  Volcanic complex
KW  -  Stress fields
KW  -  UAV
KW  -  Magma emplacement
KW  -  STRIKE-SLIP
KW  -  STRUCTURAL CONTROL
KW  -  SEISMIC ACTIVITY
KW  -  CHILEAN ANDES
KW  -  CORDON-CAULLE
KW  -  ZONE
KW  -  EARTHQUAKE
KW  -  TECTONICS
KW  -  EVOLUTION
A1  - Espinosa-Leal, J
A1  - Browning, J
A1  - Cembrano, J
A1  - Mitchell, T
A1  - Rojas, F
A1  - Moorkamp, M
A1  - Griffith, WA
A1  - Meredith, P
JF  - Journal of Volcanology and Geothermal Research
SN  - 0377-0273
PB  - ELSEVIER
UR  - https://doi.org/10.1016/j.jvolgeores.2024.108255
ID  - discovery10204564
N2  - 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.
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
EP  - 16
VL  - 458
AV  - restricted
Y1  - 2025/02/01/
TI  - Fault intersection-related stress rotation controls magma emplacement at the Nevados de Chillán Volcanic Complex
ER  -