Calbuco Volcano and minor eruptive centers distributed along the Liqui�e-Ofqui Fault Zone, Chile (41�?42� S): contrasting origin of andesitic and basaltic magma in the Southern Volcanic Zone of the Andes

1995 ◽  
Vol 119 (4) ◽  
pp. 345-361 ◽  
Author(s):  
L. L�pez-Escobar ◽  
M. A. Parada ◽  
R. Hickey-Vargas ◽  
F. A. Frey ◽  
P. D. Kempton ◽  
...  
Keyword(s):  
Fault Zone ◽  
Basaltic Magma ◽  
Volcanic Zone ◽  
The Andes ◽  
Southern Volcanic Zone ◽  
Calbuco Volcano ◽  
Eruptive Centers

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

Crustal xenoliths from Calbuco Volcano, Andean Southern Volcanic Zone: implications for crustal composition and magma-crust interaction

1995 ◽  
Vol 119 (4) ◽  
pp. 331-344
Author(s):  
R. Hickey-Vargas ◽  
Mohammad J. Abdollahi ◽  
Miguel A. Parada ◽  
Leopoldo L�pez-Escobar ◽  
Fred A. Frey
Keyword(s):  
Volcanic Zone ◽  
Crustal Composition ◽  
Southern Volcanic Zone ◽  
Calbuco Volcano ◽  
Crustal Xenoliths ◽  
Andean Southern Volcanic Zone

Multiple subduction components in the mantle wedge: Evidence from eruptive centers in the Central Southern volcanic zone, Chile

Geology ◽  
2002 ◽  
Vol 30 (3) ◽  
pp. 199 ◽  
Author(s):  
Rosemary Hickey-Vargas ◽  
Murong Sun ◽  
Leopoldo López-Escobar ◽  
Hugo Moreno-Roa ◽  
Mark K. Reagan ◽  
...  
Keyword(s):  
Mantle Wedge ◽  
Volcanic Zone ◽  
Southern Volcanic Zone ◽  
Eruptive Centers

Crustal xenoliths from Calbuco Volcano, Andean Southern Volcanic Zone: implications for crustal composition and magma-crust interaction

1995 ◽  
Vol 119 (4) ◽  
pp. 331-344 ◽  
Author(s):  
Rosemary Hickey-Vargas ◽  
Mohammad J. Abdollahi ◽  
Miguel A. Parada ◽  
Leopoldo L�pez-Escobar ◽  
Fred A. Frey
Keyword(s):  
Volcanic Zone ◽  
Crustal Composition ◽  
Southern Volcanic Zone ◽  
Calbuco Volcano ◽  
Crustal Xenoliths ◽  
Andean Southern Volcanic Zone

scholarly journals Magmatic processes under Villarrica stratovolcano (Central Southern Volcanic Zone, Chile).

2020 ◽  
Author(s):  
Paul Fugmann ◽  
Jacqueline Vander Auwera ◽  
Olivier Namur ◽  
Tonin Bechon ◽  
Olivier Bolle ◽  
...  
Keyword(s):  
Mantle Wedge ◽  
Lava Lake ◽  
Major And Trace Elements ◽  
Geochemical Data ◽  
Volcanic Zone ◽  
Southern Volcanic Zone ◽  
Thermodynamic Simulations ◽  
Rapid Ascent ◽  
Thin Crust ◽  
Eruptive Centers

<p>Magmatic arcs are usually considered to be major sites of new continental crust formation. However, the detailed differentiation processes that produce the characteristic calc-alkaline trends are still controversial. More particularly, the depth of differentiation in the arc crustal column and possible changes during the lifespan of a volcano are current subject of discussion.</p><p>The Central Southern Volcanic Zone (CSVZ) in Chile is characterized by a thin crust (~ 35 km; Hickey-Vargas et al., 2016) and by the presence of a major dextral transpressional crustal scaled structure (Liquiñe-Ofqui Fault Zone), two features that favor a rapid ascent of magmas from the mantle wedge to the surface. Recent petrological data acquired on volcanoes of the CSZV further indicate that most of the differentiation takes place at about 0.2 GPa, a depth corresponding to a major intracrustal discontinuity. However, for Villarrica stratovolcano (VR; 39.3°S, 71.6°W), estimates suggest two depths of differentiation, respectively at 0.8 and 0.2 GPa (Morgado et al. 2015, 2017).</p><p>VR is one of the most active volcanoes in the Andean Cordilleras. Since the mid 80’s, it has been constantly degasing through an open conduit filled by a summit lava lake. Several Holocene, monogenetic small eruptive centers (SECs) surround VR which forms together with Quetrupillán and Lanin stratovolcanoes a NW-SE oriented chain. It gives thus a perfect opportunity to study how the mentioned features influence the differentiation processes, their corresponding depth and the observed differentiation trends. VR is mainly composed of basaltic andesites and basaltic lavas and pyroclasts with less andesitic lavas and minor dacitic – rhyodacitic domes, while rocks from Quetrupillán and Lanin are compositionally more evolved (e.g. Hickey-Vargas et al., 1989).</p><p>Here we present mineral compositions (plagioclase, olivine, clinopyroxene) and whole-rock (lavas, pyroclasts) geochemical data for different units of VR as well as for some nearby SECs (Los Nevados, Chaillupén, San Jorge). The WR data combined with published analyses define a single differentiation trend extending from ~50 – 71 wt.% SiO<sub>2</sub>, with a compositional “Daly” gap between 58 – 62 wt.% SiO<sub>2</sub>. Moreover, a few VR samples have high Mg# up to 62 (SiO<sub>2</sub> 50.3-52.6, MgO 7.98 wt.%) and a tholeiitic affinity (e.g. AFM, K<sub>2</sub>O/Yb vs. Ta/Yb). The most mafic, tholeiitic basalts found in the area where produced by the proximate San Jorge SEC (Mg# 69, SiO<sub>2</sub> 50.6, MgO 9.5 wt.%) and interpreted by McGee et al. (2019) as reflecting a deep, melt-exhausted region of the mantle wedge. Major- and trace elements data together with supportive mass balance modelling and thermodynamic simulations with rhyolite-MELTS imply fractional crystallization as a major differentiation process.</p>

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
Sign in / Sign up

Export Citation Format

Share Document