The genetic relationship between andesites and dacites at Tungurahua volcano, Ecuador

Nauret, François; Samaniego, Pablo; Ancellin, Marie-Anne; Tournigand, Pierre-Yves; Pennec, Jean–Luc Le; Vlastelić, Ivan; Gannoun, Abdelmouhcine; Hidalgo, Silvana; Schiano, Pierre

doi:10.1016/j.jvolgeores.2017.11.012

Cited by 13 publications

(18 citation statements)

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“…This value is equal, within error margins, to the proposed value for JNdi-1 standard. Pb isotopic ratios were determined following the methods described by Nauret et al (2018), using a MC-ICP-MS at LMV. Pb isotope ratios were normalized to values of NIST SRM 981 given by Galer et al (1998).…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

“…Given the large uncertainties concerning the deep fractionation processes as well as the lower crustal compositions, we did not perform a quantitative analyse of these deep processes. However, this two-steps model has been applied on a regional Andean scale (Hildreth and Moorbath, 1988;Mamani et al, 2010;Blum-Oeste and Wörner, 2016;Ancellin et al, 2017) as well as to specific volcanic centres such as the Andahua monogenetic cones (Delacour et al, 2007), El Misti (Rivera et al, 2017), Ollagüe (Feeley and Davidson, 1994;Matioli et al, 2006), Nevados de Payachata (Davidson et al, 1990), and Lascar (Sainlot et al, 2020) in the CVZ; and Cotopaxi (Garrison et al, 2011) and Tungurahua volcanoes (Nauret et al, 2018) in the NVZ.…”

Section: The Origin Of the Magmatic Diversity: Trans-crustal Assimilation And Fractional Crystallization Processesmentioning

confidence: 99%

“…There are also arc volcanoes that mostly erupt andesitic magmas with scarce eruptions involving silica-rich magmas during sporadic (albeit larger) events [e.g. Colima in Mexico (Luhr and Carmichael, 1990;Robin et al, 1991;Macias et al, 2017), Tungurahua in Ecuador (Samaniego et al, 2011;Andujar et al, 2017;Nauret et al, 2018)]. Lastly, some arc volcanoes display temporal geochemical variations, for instance Cotopaxi volcano in Ecuador (Hall and Mothes, 2008;Garrison et al, 2011;Martel et al, 2018), where larger rhyolitic eruptions transitioned to smaller andesitic events.…”

Section: Introductionmentioning

confidence: 99%

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Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru)

Samaniego

Rivera

Manrique

et al. 2020

Journal of Volcanology and Geothermal Research

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Understanding the links between the magma differentiation processes, the magma plumbing system and the magma composition at arc volcanoes is of paramount importance for volcanic hazard assessment. In this work we focus on the post-glacial, Holocene, historical, and recent eruption products of Ubinas volcano (Peru), which display an overall decrease in silica content from the older, plinian (VEI 3-5), rhyolitic eruptions (69-71 wt.% SiO2) to the historical and recent (2006)(2007)(2008)(2009)(2013)(2014)(2015)(2016)(2017), vulcanian (VEI 1-2) basaltic andesitic eruptions (55-57 wt.% SiO2). Based on a comprehensive study of the major and trace elements and the Sr-Nd-Pb isotopes, we conclude that this temporal pattern reflects the evolution of the Ubinas magmas in the middle-to-upper crust by a coupled Assimilation-Fractional Crystallization (AFC) process involving a cumulate composed of plagioclase, amphibole, clinopyroxene, orthopyroxene and Fe-Ti oxides, with minor amounts of olivine and biotite at the mafic and felsic end-members, respectively. Upper crustal assimilation is limited to 5-8 vol.%, but the overall radiogenic Sr-Nd-Pb signature of the Ubinas magmas requires a larger crustal component, which must therefore occur at middle to lower crustal depths. The petrology of the Ubinas magmas also points to an overall increase in P-T conditions: the large Holocene dacitic and rhyolitic eruptions record temperatures ranging from 800 to 850ºC and pressures in the range of 200-400 MPa, whereas the historical and recent (2006)(2007)(2008)(2009)(2013)(2014)(2015)(2016)(2017) basaltic andesitic eruptions provide higher temperatures and pressures (1000ºC, >300-400 MPa). Overall, the thermobarometry, phase equilibrium and geochemical constraints allow us to propose the existence of a middle-to-upper crust magma column composed of a highly crystalline magma mush containing batches of liquid magma, which seems to be continually recharged from deeper levels. On the basis of the petrological nature of the historical basaltic andesitic eruptions (CE 1667(CE , 2006(CE -2009(CE , 2013(CE -2017, we postulate that during the last centuries, Ubinas experienced a recharge-dominated process, with no evidence for a rejuvenation of the silica-rich reservoir that fed the large Holocene dacitic to rhyolitic eruptions. This study highlights the importance of detailed petrological studies of Holocene sequences at explosive arc volcanoes in order to constrain the magmatic processes and conditions that control large explosive eruptions.

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Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Section: The Origin Of the Magmatic Diversity: Trans-crustal Assimilation And Fractional Crystallization Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru)

Samaniego

Rivera

Manrique

et al. 2020

Journal of Volcanology and Geothermal Research

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show abstract

“…Th/La ratio positively correlates with silica content while Ba/U and Rb/Th ratios display a negative correlation with silica content. Both Th/La and Ba/U ratios evolutions with differentiation partly reveal the fractionation of amphibole (Nauret et al, 2017). Because amphibole is rarely a phenocryst phase of Lascar magmas, amphibole may fractionate at depth (Davidson et al, 2007).…”

Section: (D Mreementioning

confidence: 99%

“…Finally, the evolution towards silica-rich compositions (RD, Blum-Oeste&Wörner, 2016) is ascribed to shallow differentiation by assimilation of the upper continental crust (AFC) (Mamani et al, 2008;Blum-Oeste&Wörner, 2016;Nauret et al, 2017). Indeed, magmas assimilation of the upper crust by AFC processes is prone to increase the silica content of magma by differentiation as well as their Sr-Pb isotopic composition.…”

Section: Pb-sr Isotopesmentioning

confidence: 99%

Sr–Pb isotopes signature of Lascar volcano (Chile): Insight into contamination of arc magmas ascending through a thick continental crust

Sainlot

Vlastelić

Nauret

et al. 2020

Journal of South American Earth Sciences

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In the Central Volcanic Zone of the Andean cordillera (CVZ), thickening of the continental crust 30 Ma ago led to the production of increasingly differentiated magmas. Better constrain on the interactions between ascending magmas and the thick continental crust are needed to understand the contamination processes and their implications on the geochemical diversity of arc magmas. Lascar volcano figures among the most active Quaternary volcano of the CVZ and yet geochemical studies on its volcanic products remain scarce. We lead major-, trace elements and Pb-Sr isotopes measurements on 10 Lascar samples representative of the different petrologic types (andesitic to dacitic) in order to better characterize the Pb-Sr isotopic signature and diversity of Lascar magmas yet defined based on only 8 samples.

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Noble gas magmatic signature of the Andean Northern Volcanic Zone from fluid inclusions in minerals

et al. 2021

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The genetic relationship between andesites and dacites at Tungurahua volcano, Ecuador

Cited by 13 publications

References 79 publications

Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru)

Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru)

Sr–Pb isotopes signature of Lascar volcano (Chile): Insight into contamination of arc magmas ascending through a thick continental crust

Noble gas magmatic signature of the Andean Northern Volcanic Zone from fluid inclusions in minerals

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