[en] The recurrent explosive eruptions of Calbuco (Andean Southern Volcanic Zone (SVZ)) threat a rapidly expanding tour- istic and economic region of Chile. Providing tighter constraints on its magmatic system is therefore important for better monitoring its activity. Calbuco is also distinguished by hornblende-bearing assemblages that contrast with the anhydrous parageneses of most Central SVZ volcanoes. Here we build on previous work to propose a detailed petrological model of the magmatic system beneath Calbuco. Geochemical data acquired on a hundred samples collected in the four units of the volcano show no secular compositional change indicating a steady magmatic system since ~ 300 ka. A tholeiitic Al2O3-rich (20 wt. %) basalt (Mg# = 0.59) is the parent magma of a differentiation trend straddling the tholeiitic/calc-alkaline fields and displaying a narrow compositional Daly gap. Amphibole crystallization was enabled by the higher H2O content of the basalt (3–3.5 wt. % H2O at 50 wt. % SiO2) compared to neighboring volcanoes. This characteristic is inherited from the primary mantle melt and possibly results from a lower degree of partial melting induced by the mantle wedge thermal structure. Although macrocrysts are not all in chemical equilibrium with their host rocks and were thus presumably unlocked from the zoned crystal mush and transported in the carrier melt, the bulk-rock trend follows both experimental liquid lines of descent and the chemical trend of calculated melts in equilibrium with amphibole (AEMs). These contradictory observations can be reconciled if minerals are transported in near cotectic proportions. The AEMs overlap the Daly gap revealing that the missing liquid compositions were present in the storage region. Geothermobarometers all indicate that the chemical diversity from basalt to dacite was acquired at a shallow depth (210–460 MPa). We suggest that differentiation from the primary magma to the parental basalt took place either in the same storage region or at the MOHO.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Vander Auwera, Jacqueline ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Montalbano, Salvatrice ; Université de Liège - ULiège > SEGI : Développements : Outils de gestion enseignenment
Namur, Olivier ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Bechon, Tonin ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Schiano, Pierre; Laboratoire Magmas et Volcans, Université Clermont Auvergne, Clermont-Ferrand, France
Devidal, Jean-Luc; Laboratoire Magmas et Volcans, Université Clermont Auvergne, Clermont-Ferrand, France
The petrology of a hazardous volcano: Calbuco (Central Southern VolcanicZone, Chile)
Publication date :
2021
Journal title :
Contributions to Mineralogy and Petrology
ISSN :
0010-7999
eISSN :
1432-0967
Publisher :
Springer, Germany
Volume :
176
Issue :
6
Pages :
46
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
CDR J.00066.14, PDR T.0079.18, Odysseus grant (ON)
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE]
Funding text :
Luis Lara is greatly thanked for his help in the organization of the fieldwork. Pia Plese participated to the 2016 fieldwork. This research was supported by FNRS Grants CDR J.00066.14, PDR T.0079.18 to JVDA. ON acknowledges support from the FWO through an Odysseus grant. We thank our reviewers for providing constructive comments that improved this work.
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