Crustal seismicity associated to rpid surface uplift at Laguna del Maule Volcanic Complex, Southern Volcanic Zone of the Andes

2018 ◽  
Vol 353 ◽  
pp. 83-94 ◽  
Author(s):  
Carlos Cardona ◽  
Andrés Tassara ◽  
Fernando Gil-Cruz ◽  
Luis Lara ◽  
Sergio Morales ◽  
...  
Keyword(s):  
Volcanic Complex ◽  
Volcanic Zone ◽  
Surface Uplift ◽  
The Andes ◽  
Southern Volcanic Zone

scholarly journals Temporal Evolution of Magmatism in the Northern Volcanic Zone of the Andes: The Geology and Petrology of Cayambe Volcanic Complex (Ecuador)

2005 ◽  
Vol 46 (11) ◽  
pp. 2225-2252 ◽  
Author(s):  
PABLO SAMANIEGO ◽  
HERVÉ MARTIN ◽  
MICHEL MONZIER ◽  
CLAUDE ROBIN ◽  
MICHEL FORNARI ◽  
...  
Keyword(s):  
Temporal Evolution ◽  
Volcanic Complex ◽  
Volcanic Zone ◽  
The Andes ◽  
Northern Volcanic Zone

Thermo-mechanical behavior of a granodiorite from the Liquiñe fractured geothermal system (39°S) in the Southern Volcanic Zone of the Andes

Geothermics ◽  
2020 ◽  
Vol 87 ◽  
pp. 101828 ◽  
Author(s):  
J. Sepúlveda ◽  
G. Arancibia ◽  
E. Molina ◽  
J.P. Gilbert ◽  
M. Duda ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Geothermal System ◽  
Volcanic Zone ◽  
The Andes ◽  
Southern Volcanic Zone

scholarly journals Boron and other trace element constraints on the slab-derived component in Quaternary volcanic rocks from the Southern Volcanic Zone of the Andes

2013 ◽  
Vol 47 (2) ◽  
pp. 185-199 ◽  
Author(s):  
HIRONAO SHINJOE ◽  
YUJI ORIHASHI ◽  
JOS^|^Eacute; A. NARANJO ◽  
DAIJI HIRATA ◽  
TOSHIAKI HASENAKA ◽  
...  
Keyword(s):  
Trace Element ◽  
Volcanic Rocks ◽  
Volcanic Zone ◽  
The Andes ◽  
Southern Volcanic Zone

scholarly journals Tectonic controls on geomorphology and spatial distribution of monogenetic volcanoes in the Central Southern Volcanic Zone of the Andes (Argentina)

2021 ◽  
Author(s):  
Fernanda Silva Santos ◽  
Carlos Sommer ◽  
Mauricio Haag ◽  
Walter Báez ◽  
Alberto Caselli ◽  
...  
Keyword(s):  
Structural Control ◽  
Tectonic Setting ◽  
Volcanic Field ◽  
Eruption Dynamics ◽  
Volcanic Zone ◽  
Nazca Plate ◽  
Cinder Cones ◽  
The Andes ◽  
Southern Volcanic Zone ◽  
Monogenetic Volcanoes

Monogenetic volcanoes are among the most common volcanic landforms on Earth. The morphology and distribution of small volcanoes can provide important information about eruption dynamics and tectonics. The Southern Volcanic Zone of the Andes (CSVZ) comprises one of the most active magmatic regions on Earth. Characterized by the presence of polygenetic volcanoes and calderas in a complex tectonic setting, this region also hosts hundreds of small, back-arc monogenetic volcanoes. In this contribution, we apply a Geographic Information System (GIS) that combines imagery data and digital elevation models to establish the first comprehensive dataset of monogenetic volcanoes in the CSVZ (38° to 40° S), exploring their eruption dynamics and relationship to tectonic and structural processes. Combining spatial analysis and geomorphological observations, we identify the presence of 356 monogenetic volcanoes distributed into nine clusters, now grouped in the Zapala Volcanic Field (ZVF). The ZVF is marked by the predominance of cinder cones (80%) followed by phreatomagmatic volcanoes (20%), suggesting some influence of external water in the eruption dynamics. Generally, monogenetic vents present a clear association with local and regional lineaments, suggesting a strong structural control on the occurrence of the monogenetic deposits. The higher vent densities are observed in the southern Loncopué Though, an important extensional feature related to tearing of the subducted Nazca plate underneath the South American Plate. Morphometric parameters of cinder cones indicate variable stress orientations in the CSVZ that possibly result from the oblique tectonics in the region. From north to south, the maximum principal stress rotates from NE-SW to E-W and becomes progressively less constrained as it distances from the current magmatic arc. Based on the relative ages, we map the evolution of monogenetic volcanism through time. Our results suggest a waning in the monogenetic activity in ZVF over time. When compared to monogenetic fields in the Central Andes, the ZVF is marked by higher vent densities and number of phreatomagmatic landforms, with the absence of lava domes. This ultimately reflects the contrasting crustal structure and climate conditions of these two regions.

scholarly journals The 4.2 ka cal BP major eruption of Cerro Blanco, Central Andes

2020 ◽  
Author(s):  
Jose-Luis Fernandez-Turiel ◽  
Francisco-Jose Perez-Torrado ◽  
Alejandro Rodríguez-Gonzalez ◽  
Norma Ratto ◽  
Marta Rejas ◽  
...  
Keyword(s):  
Risk Mitigation ◽  
Volcanic Hazards ◽  
Mitigation Measures ◽  
Explosive Eruptions ◽  
Volcanic Complex ◽  
Volcanic Zone ◽  
Ash Fall ◽  
The Andes ◽  
Local Environments ◽  
Major Eruption

<p>The major eruption of the Cerro Blanco Volcanic Complex (CBVC), in the Central Volcanic Zone of the Andes, NW Argentina, dated at 4410–4150 a cal BP, was investigated confirming that is the most important of the three major Holocene felsic eruptive events identified in the southern Puna (Fernandez-Turiel et al., 2019). Identification of pre–, syn–, and post–caldera products of CBVC allowed us to estimate the distribution of the Plinian fallout during the paroxysmal syn–caldera phase of the eruption. Results provide evidence for a major rhyolitic explosive eruption that spread volcanic deposits over an area of about 500,000 km<sup>2</sup>, accumulating >100 km<sup>3</sup> of tephra (bulk volume). This last value exceeds the lower threshold of Volcanic Explosive Index (VEI) of 7. Ash-fall deposits mantled the region at distances >400 km from source and thick pyroclastic-flow deposits filled neighbouring valleys up to several tens of kilometres from the vent. This eruption is the largest documented during the past five millennia in the Central Volcanic Zone of the Andes, and is probably one of the largest Holocene explosive eruptions in the world.</p><p>The implications of the findings of the present work reach far beyond having some chronostratigraphic markers. Further interdisciplinary research should be performed in order to draw general conclusions on these impacts in local environments and the disruptive consequences for local communities. This is invaluable not just for understanding how the system may have been affected over time, but also for evaluating volcanic hazards and risk mitigation measures related to potential future large explosive eruptions.</p><p>Financial support was provided by the ASH and QUECA Projects (MINECO, CGL2008–00099 and CGL2011–23307). We acknowledge the assistance in the analytical work of labGEOTOP Geochemistry Laboratory (infrastructure co–funded by ERDF–EU Ref. CSIC08–4E–001) and DRX Laboratory (infrastructure co–funded by ERDF–EU Ref. CSIC10–4E–141) (J. Ibañez, J. Elvira and S. Alvarez) of ICTJA-CSIC, and EPMA and SEM Laboratories of CCiTUB (X. Llovet and J. Garcia Veigas). This study was carried out in the framework of the Research Consolidated Groups GEOVOL (Canary Islands Government, ULPGC) and GEOPAM (Generalitat de Catalunya, 2017 SGR 1494).</p><p> </p><p>Fernandez–Turiel, J.L., Perez–Torrado, F.J., Rodriguez–Gonzalez, A., Saavedra, J., Carracedo, J.C., Rejas, M., Lobo, A., Osterrieth, M., Carrizo, J.I., Esteban, G., Gallardo, J., Ratto, N., 2019. The large eruption 4.2 ka cal BP in Cerro Blanco, Central Volcanic Zone, Andes: Insights to the Holocene eruptive deposits in the southern Puna and adjacent regions. Estudios Geologicos 75, e088.</p>

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