A geochemical approach to distinguishing competing tectono-magmatic processes preserved in small eruptive centres

McGee, Lucy; Brahm, Raimundo; Rowe, Michael C.; Handley, Heather; Morgado, Eduardo; Lara, Luis E.; Turner, Michael; Vinet, Nicolas; Parada, Miguel A.; Valdivia, Pedro

doi:10.1007/s00410-017-1360-2

Cited by 22 publications

(15 citation statements)

References 76 publications

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“…Magma ascent at Cordón Caulle-Puyehue complex, by contrast, is suggested to have been rapid, from the result of uranium-series isotopes (Jicha et al, 2007). Parallel uranium-series work on magmas of the CHSEC by McGee et al (2017) has suggested both fast melting and ascent of magmas after fluid addition to the mantle region beneath.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Transient shallow reservoirs beneath small eruptive centres: Constraints from Mg-Fe interdiffusion in olivine

Morgado

Parada

Morgan

et al. 2017

Journal of Volcanology and Geothermal Research

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Small eruptive centres commonly have more primitive lavas than those associated with stratovolcanoes, an observation that has been taken to indicate a short magma residence in the crust relative to those reservoirs below stratovolcanoes. The Caburgua cones of the Andean Southern Volcanic Zone from a basaltic small eruptive centre where this can be tested/ Here, we use MELTS simulations, and the available thermobarometry data to determine the conditions of olivine crystal rim formation and the Mg-Fe diffusion modelling to determine the magma residence times of those rims in the crust. Results yield timescales varying from a few days to dozens of days, and if freezing is to be avoided, can only be explained by some

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Section: Accepted Manuscriptmentioning

confidence: 99%

Transient shallow reservoirs beneath small eruptive centres: Constraints from Mg-Fe interdiffusion in olivine

Morgado

Parada

Morgan

et al. 2017

Journal of Volcanology and Geothermal Research

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“…The (Romero et al, 2018). c. Total-Alkali Silica (TAS Le Bas et al, 1986) diagram showing the bulk rock compositions of Villarrica eruptions and basement rocks from past studies (Clavero-Ribes, 1996;Hickey-Vargas et al, 1989Lohmar, 2008;McGee et al, 2017;Morgado et al, 2015;Pioli et al, 2015;Pizarro et al, 2019;Silva Parejas, 2008;Wehrmann et al, 2014;Witter et al, 2004;Zajacz & Halter, 2007). This shows the homogeneous nature of Villarrica eruptive products: the vast majority of the juvenile products (98%) have 52-57 wt% SiO2.…”

Section: Database Compilationmentioning

confidence: 99%

Insights into Magma Storage Beneath a Frequently Erupting Arc Volcano (Villarrica, Chile) from Unsupervised Machine Learning Analysis of Mineral Compositions

Boschetty¹,

Ferguson²,

Cortés³

et al. 2022

Preprint

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A key method to investigate magma dynamics is the analysis of the crystal cargoes carried by erupted magmas. These cargoes may comprise crystals that crystallize in different parts of the magmatic system (throughout the crust) and/or different times. While an individual eruption likely provides a partial view of the sub-volcanic plumbing system, compiling data from multiple eruptions builds a picture of the whole magmatic system. In this study we use machine learning techniques to analyze a large (>2000) compilation of mineral compositions from a highly active arc volcano: Villarrica, Chile. Villarrica's post-glacial eruptive activity (14 ka–present) displays large variation in eruptive style (mafic ignimbrites to Hawaiian effusive eruptions) yet its eruptive products have a near constant basalt-basaltic andesite bulk-rock composition. What, therefore, is driving explosive eruptions at Villarrica and can differences in storage dynamics be related to eruptive style? We used hierarchical cluster analysis to detect previously undetected structure in olivine, plagioclase and clinopyroxene compositions, revealing the presence of compositionally distinct clusters. Using rhyolite-MELTS thermodynamic modeling we related these clusters to intensive magmatic variables: temperature, pressure, water content and oxygen fugacity. Our results provide evidence for the existence of multiple discrete (spatial and temporal) magma reservoirs beneath Villarrica where melts differentiate and mix with incoming more primitive magma. The compositional diversity of an erupted crystal cargo strongly correlates with eruptive intensity, and we postulate that mixing between primitive and differentiated magma drives explosive activity at Villarrica.

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“…Thus, the extend of magma differentiation is variable and therefore the geochemistry of satellite monogenetic cones is modified to the polygenic edifices (i.e. Huililco monogenetic cones versus Llaima stratovolcano in Chile; [2]).…”

Section: Spatial Heterogeneities Of Magma Sourcementioning

confidence: 99%

“…from the effusive as explosive volcanic rocks also lead to various interrogations regarding origin of the magma that circulate in the lithosphere below monogenetic volcanic fields. Most of all, the presence of spatial magma heterogeneities is a major observation discussed and synthesized for volcanic fields in subduction zones [1][2][3]. Visualization tools are required to facilitate these observations and analyses for understanding the building of minor volcanic centers as defining the origin of the magma in monogenetic fields.…”

Section: Introductionmentioning

confidence: 99%

Spatial Visualization of Geochemical Data: Application to the Chichinautzin Volcanic Field, Mexico

Robidoux¹,

Roberge²,

Adams³

2021

Updates in Volcanology - Transdisciplinary Nature of Volcano Science

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The presence of spatial magma heterogeneities in volcanic monogenetic fields is a major observation discussed as well synthesized for worldwide volcanic fields. Magma heterogeneities still have not been visualized in the form of detailed spatial analyst tools, which could further help structuring works of geological mapping, volcanic hazard, and geoheritage evaluations. Here we synthetized 32 published datasets with a novel geochemical mapping model inspired by sub-disciplines of geomatic in one of the most documented monogenetic fields on earth: the Chichinautzin Volcanic Field (CVF) in Mexico. The volcanic units from CVF are covering the 2500 km2 area, and its neighbor stratovolcanoes are bordering the limit of most volcanic centers (Popocatepetl, Iztaccihuatl, and Nevado de Toluca). The results illustrate polygons and point map symbols from geochemical markers such as Alkalis vs SiO2, Sr/Y, and Ba/Nb. The geochemical heterogeneity of the CVF monogenetic bodies decreases as it approaches the Popocatepetl-Iztaccihuatl stratovolcanoes. This alignment is not observed in the occidental CVF portion near the flank of Nevado de Toluca, but geochemical anomalies associated to markers of continental crust interaction such as Sr/Y follow elongated patterns that are not strictly following structural lines and faults mapped on surface.

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A geochemical approach to distinguishing competing tectono-magmatic processes preserved in small eruptive centres

Cited by 22 publications

References 76 publications

Transient shallow reservoirs beneath small eruptive centres: Constraints from Mg-Fe interdiffusion in olivine

Transient shallow reservoirs beneath small eruptive centres: Constraints from Mg-Fe interdiffusion in olivine

Insights into Magma Storage Beneath a Frequently Erupting Arc Volcano (Villarrica, Chile) from Unsupervised Machine Learning Analysis of Mineral Compositions

Spatial Visualization of Geochemical Data: Application to the Chichinautzin Volcanic Field, Mexico

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