Multi-scale flow structure of a strike-slip tectonic setting: A self-similar model for the Liquiñe-Ofqui Fault System and the Andean Transverse Faults, Southern Andes (39–40°S)

Roquer, Tomás; Arancibia, Gloria; Crempien, Jorge G. F.; Mery, Domingo; Rowland, J. V.; Sepúlveda, Josefa; Veloso, Eugenio E.; Nehler, Mathias; Bracke, Rolf; Morata, Diego

doi:10.1016/j.geothermics.2022.102424

Cited by 2 publications

(1 citation statement)

References 88 publications

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“…In the continent, two regional fault arrangements accommodate the strain partitioning due to oblique convergence: the Liquiñe-Ofqui Fault System (LOFS), and the Andean Transverse Faults (ATFs). The LOFS is a NS-to NNE-striking intra-arc fault system of continental scale (~1,200 km long) with dextral and dextral-reverse kinematics, and minor NE-to ENE-striking secondary faults with dextral, dextral-reverse, and dextral-normal kinematics (Cembrano et al, 1996(Cembrano et al, , 2000Arancibia et al, 1999;Lavenu and Cembrano, 1999;Lange et al, 2008;Roquer et al, 2022). The ATFs are NW-SE faults striking 30 to 60° away from the main trend of the arc (Stanton-Yonge et al, 2016).…”

Section: Tectonic Settingmentioning

confidence: 99%

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

Romero,

Vergara-Pinto,

Forte

et al. 2024

andgeo

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The Andean Southern Volcanic Zone (SVZ) concentrates many of the most active volcanoes of the Andean continental arc, as well as the region’s most recent and impactful volcanic eruptions. In this contribution, we briefly revise the general characteristics of the SVZ volcanism and provide a synthesis of the scientific findings related to the latest volcanic eruptions (430 peer-reviewed publications with over 9,000 citations, with large-magnitude (VEI 4-5) eruptions being the most studied. Our study shows that SVZ research has been primarily focused on environmental and atmospheric impacts (29%), eruption descriptions and physical volcanology (20%), volcanic hazard and risk assessments (15%), and other investigations complementary to volcanology. Whereas the least silicic eruptions (e.g., Llaima 2008-2009 and Villarrica 2015) shed light on magma replenishment and degassing dynamics controlling eruption styles, intermediate eruptions (andesitic-dacitic) offered clues on either rapid or slow eruption initiation, with relevant findings on phreatic-to-magmatic style transitions and eruption triggering mechanisms. On the other hand, silicic (i.e., rhyolite-rhyodacite) eruptions provided unique observations on rapid magma ascent, high-rate magma extrusion, rheology, fragmentation processes, and style transitions. These recent eruptions have also inspired a new generation of tephrochronological, tephrostratigraphical, and physical volcanology studies, aimed at assessing the long-term (kyr-scale) evolution of the volcanic systems and their associated hazards. We debate how the knowledge gained from research and the long-term human coexistence with volcanoes are relevant to reducing volcanic risk in the SVZ. Finally, we discuss how challenges and opportunities emerging from other disciplines can complement our understanding of volcanism in this active region.

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Section: Tectonic Settingmentioning

confidence: 99%

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

Romero,

Vergara-Pinto,

Forte

et al. 2024

andgeo

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Strain partitioning in the Patagonian Broken Foreland: influence of structural inheritance of early Andean deformation

García,

López,

Bucher

et al. 2024

JGS

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In the context of Andean-type oblique convergence, strain partitioning between thrust and strike-slip tectonics is well-documented in the arc region. However, the impact of this configuration in the retroarc remains poorly understood, especially in broken foreland systems where basement structures compartmentalize the retroarc into small intermontane sedimentary basins. The spatiotemporal analysis of tectonic evolution and the role of inherited weaknesses in this area are often debated. This study addresses these uncertainties by integrating geometric and kinematic analyses of tectonic structures within the Sañicó Massif in the North Patagonian foreland. Results reveal two deformational episodes. The initial Late Cretaceous to Paleocene episode represents a contractional deformation phase, with NW-SE shortening direction causing the tectonic inversion of pre-Andean rift depocentres. The second episode records a Neogene transpressional regime with both contractional and strike-slip deformation, with E-W to NE-SW shortening direction, which progressed under reactivation of pre-existing structures and generated new faults. This work demonstrates the Neogene propagation of the strike-slip regime towards the retroarc, defining strain partitioning at various scales and highlighting its interaction with pre-existing structures. These results enhance our understanding of the complex tectonic history in oblique subduction settings, providing significant evidence of the structural inheritance in retroarc systems.

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Multi-scale flow structure of a strike-slip tectonic setting: A self-similar model for the Liquiñe-Ofqui Fault System and the Andean Transverse Faults, Southern Andes (39–40°S)

Cited by 2 publications

References 88 publications

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

Strain partitioning in the Patagonian Broken Foreland: influence of structural inheritance of early Andean deformation

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