Condiciones de cristalización y diferenciación de las lavas del volcán El Metate (Campo Volcánico de Michoacán-Guanajuato, México)

Losantos, Emma; Cebriá, José-María; Morán-Zenteno, Dante J.; Martiny, Barbara M.; López-Ruiz, José

doi:10.3989/egeol.41806.349

Cited by 5 publications

(5 citation statements)

References 35 publications

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“…Our results are in general agreement with previously published data (Fig. 6, Hasenaka et al 1994;Losantos et al 2014).…”

Section: Major and Trace Element Contentssupporting

confidence: 94%

“…In this paper, we provide new insights on magmatic processes during the ∼AD 1250 eruption of El Metate, which is both the most recent monogenetic shield in Mexico and the largest andesitic effusive eruption during the Holocene worldwide (Chevrel et al 2016). The only previous geochemical study of El Metate lavas (Losantos et al 2014) did not specify sampling locations and reported only major element data. Here, we first summarize the main results of a recent study focused on the age, volume, chronology, and impact of the eruption (Chevrel et al 2016) and then present new data on lava morphology.…”

Section: Introductionmentioning

confidence: 99%

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The ∼AD 1250 effusive eruption of El Metate shield volcano (Michoacán, Mexico): magma source, crustal storage, eruptive dynamics, and lava rheology

2016

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Medium-sized volcanoes, also known as Mexican shields due to their andesitic composition and slightly higher slope angles in comparison to Icelandic shields, occur across the Trans-Mexican Volcanic Belt and represent nearly one third of all volcanic edifices in the Michoacán-Guanajuato Volcanic Field (MGVF). Many questions about their origin and eruptive dynamics remain unanswered. Here, we focus on El Metate, the youngest (∼AD 1250) monogenetic shield volcano of the MGVF and the most voluminous (∼9.2 km 3 dense rock equivalent) Holocene eruption in Mexico. Its eruptive history was reconstructed through detailed mapping, geochemical analysis (major and trace elements, Sr-Nd-Pb isotopic data), and rheological study of its thick andesitic flows. Early and late flow units have distinct morphologies, chemical and mineralogical compositions, and isotopic signatures which show that these lavas were fed by two separate magma batches that originated from a heterogeneous mantle source and followed distinct differentiation paths during their ascent. Thermobarometry calculations constraining the conditions of crystallization indicate a temporary storage of the last erupted magma batch at a depth of ∼7-10 km. Lava rheology was estimated using petrographic characteristics, geochemical data, and flow dimensions. The magma viscosity increased from 10 2 -10 3 Pa s prior to eruption through 10 6 -10 8 Pa s during ascent, to 10 9 -10 11 Pa s during lava emplacement. Though magma viscosity was quite high, the eruption was purely effusive. The explosive eruption of such a large magma volume was probably avoided due to efficient open system degassing (outgassing) of the magma as it ascended through the uppermost crust and erupted at the surface.

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“…Our results are in general agreement with previously published data (Fig. 6, Hasenaka et al 1994;Losantos et al 2014).…”

Section: Major and Trace Element Contentssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

The ∼AD 1250 effusive eruption of El Metate shield volcano (Michoacán, Mexico): magma source, crustal storage, eruptive dynamics, and lava rheology

2016

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“…Therefore, in order to apply them strictly, only those crystals that do not show evidence of disequilibrium (e.g., sieve textures and reaction rims) can be considered. Thus, calculations based on mineral-liquid equilibria have been limited to compositions obtained in those mineral areas without disequilibrium textures and which are in contact with groundmass (Losantos et al, 2014), assuming that the bulk rock composition roughly represents the magma composition in equilibrium with phases it contains.…”

Section: Methods For Geothermobarometric and Hygrometric Calculationsmentioning

confidence: 99%

The late Holocene Nealtican lava-flow field, Popocatépetl volcano, central Mexico: Emplacement dynamics and future hazards

et al. 2022

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Popocatépetl, one of the most hazardous volcanoes worldwide, poses significant threats for nearby populations in central Mexico. Therefore, it is important to reconstruct its eruptive history, including estimates of lava-flow emplacement times and their rheological properties. These studies define possible future eruptive scenarios and are necessary to mitigate the risk. Stratigraphic studies of the cal 350−50 B.C. Lorenzo Plinian pumice sequence indicate that effusive activity (Nealtican lava-flow field) occurred shortly after explosive activity, reflecting drastic changes in the eruptive dynamics. It was likely due to the efficient degassing of the magma during the Plinian phase and a decrease of magma ascent and decompression rates. Magma mixing, fractional crystallization, and a minor crust assimilation are the processes controlling the differentiation of the Nealtican lavas. We used lava chemical and mineralogical composition to estimate lava-flow viscosities, and used high-resolution elevation data to estimate emplacement times. Results indicate that lava viscosities of andesites and dacites ranged from 109 to 1012 Pa·s and emplacement durations were between ∼1 and ∼29 years, depending on the flow unit and morphological method employed. Considering the entire volume of emitted lava (4.2 km3) and a mean output rate of ∼1 m3/s to ∼15 m3/s, we estimated that the effusive phase that produced the Nealtican lava-flow field may have lasted ∼35 years. This eruption had a considerable impact on pre-Hispanic settlements around the volcano, whose population exodus and relocation probably contributed to the rise of important cities in central Mexico, such as Teotihuacán and Cholula.

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“…Furthermore, for each epoch, we present the geochemical characteristics of the volcanic products associated with various structures. The geochemical results obtained in this study were complemented with data from previous works conducted by Murphy (1986), Ortega-Gutiérrez et al (2014), Losantos (2017), andLosantos et al (2017) (Table S2).…”

Section: Areamentioning

confidence: 82%

“…The division between the alkaline and sub-alkaline rocks is from Irvine and Baragar (1971). Some of the data are from Murphy (1986), Ortega-Gutiérrez et al (2014), Losantos (2017) Figure 12. Probability distribution plots of 40 Ar/ 39 Ar ages from the areas of Valle de Santiago (this study; Table 1); NW Morelia (Avellán et al, 2020), Western Zacapu (Reyes-Guzmán et al, 2018), Pátzcuaro (Osorio-Ocampo et al, 2018; Tacámbaro-Puruarán (Guilbaud et al, 2012), and Jorullo (Guilbaud et al, 2011).…”

Section: Acknowledgmentsmentioning

confidence: 99%

Radiometric dating (40Ar/39Ar and 14C), compositions, and erupted volumes of volcanoes of the Valle de Santiago area (Michoacán-Guanajuato Volcanic Field, México)

Rangel Granados,

Siebe,

Suárez-Jiménez

et al. 2024

Preprint

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The Valle de Santiago (VS) area is located in the NE sector of the Michoacán-Guanajuato Volcanic Field, within the central part of the Trans-Mexican Volcanic Belt (TMVB). Based on geological mapping of a ~2,800 km2 quadrangle, 40Ar/39Ar and radiocarbon dating, morphometry, and whole-rock chemical and petrographic analyses of the volcanic products, we established the stratigraphy and eruptive history of the VS area. A total of 118 volcanic landforms was identified, including 61 scoria cones/ramparts with or without associated lava flows (5.6 vol.%), 21 phreatomagmatic volcanoes (1.8 vol.%), 20 medium-sized shield volcanoes (90.6 vol.%), 8 lava domes (0.7 vol.%), and 8 isolated lava flows (1.3 vol.%). Volcanism in VS began ~8 Ma ago in the NW, with an effusive eruptive style. After a long hiatus (~3 Ma), volcanism resumed in the Pliocene at ~4.9 Ma, culminating in the Late Pleistocene (~11 ka). From the Pliocene to the Middle Pleistocene, volcanism was distributed throughout the VS area, and was predominantly effusive, giving rise to voluminous medium-sized shield volcanoes (e.g., Cerro Grande, Cerro Culiacán, and Picacho-Cerro Prieto). In the Late Pleistocene, volcanism continued in the W of VS, but mainly along an NNW-SSE oriented stripe where phreatomagmatic eruptions dominated. This type of activity was facilitated by fractured aquifers on the slopes of shield volcanoes, and favorable climate conditions during the Late Pleistocene. Erupted products are mainly basaltic andesites/basaltic trachyandesites (52 vol.%), followed by andesites (32.9 vol.%), basalts/trachybasalts (13.8 vol.%), trachyandesites (0.9 vol.%) and rhyolites (0.4 vol.%). Notably, the chemical affinity of the volcanic products shifted over time, transitioning from solely sub-alkaline to both, subalkaline and alkaline by the Late Pleistocene. The VS area holds one of the three largest phreatomagmatic clusters in the entire TMVB, which offers an excellent opportunity to study the conditions favoring phreatomagmatism and provides records of intense volcanic activity during the Plio-Pleistocene.

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Condiciones de cristalización y diferenciación de las lavas del volcán El Metate (Campo Volcánico de Michoacán-Guanajuato, México)

Cited by 5 publications

References 35 publications

The ∼AD 1250 effusive eruption of El Metate shield volcano (Michoacán, Mexico): magma source, crustal storage, eruptive dynamics, and lava rheology

The ∼AD 1250 effusive eruption of El Metate shield volcano (Michoacán, Mexico): magma source, crustal storage, eruptive dynamics, and lava rheology

The late Holocene Nealtican lava-flow field, Popocatépetl volcano, central Mexico: Emplacement dynamics and future hazards

Radiometric dating (40Ar/39Ar and 14C), compositions, and erupted volumes of volcanoes of the Valle de Santiago area (Michoacán-Guanajuato Volcanic Field, México)

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