Petrogenesis of the alkaline and calcalkaline monogenetic volcanism in the northern sector of the Michoacán-Guanajuato Volcanic Field (Central Mexico)

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

doi:10.1016/j.lithos.2017.07.013

Cited by 9 publications

(18 citation statements)

References 70 publications

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“…The petrogenesis of silicic magmas from the MGVF is a pending task. Reported petrogenetic studies are exclusive of mafic-intermediate magmas in the Tancítaro-Jorullo areas (e.g., Ownby et al, 2011;Larrea et al, 2019, Larrea et al, 2021Gilbaud et al, 2019;Johnson et al, 2008) and of some isolated locations in the NE border of the volcanic field (Losantos et al, 2017). Although the genesis of silicic rocks in the MGVF has been barely explored (Ownby et al, 2011;Pérez-Orozco et al, 2018), the mechanisms that produce dacites and rhyolites are worldwide recognized.…”

Section: Discussionmentioning

confidence: 99%

“…Rocks from the MGVF are mainly calc-alkaline (Hasenaka and Carmichael, 1987;Gómez-Tuena et al, 2005;Gómez-Tuena et al, 2018), although some intraplate and potassic rocks occur (Cavazos-Tovar, 2006;Ortega-Gutierrez et al, 2014b;Losantos et al, 2017). Rocks are predominantly intermediate, 40 % of all known rocks are andesites and 33 % are basaltic-andesites (Figure 2).…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…Rocks are predominantly intermediate, 40 % of all known rocks are andesites and 33 % are basaltic-andesites (Figure 2). Previous works proposed that the mafic and intermediate magmas erupted in the MGVF were derived from a combination of partial melting of a heterogeneous mantle doped with fluids from subducted sediments and oceanic crust (Larrea et al, 2019;Gilbaud et al, 2019), partial melting of the deep crust (Ownby et al, 2011), assimilation and fractional crystallization (AFC) processes (McBirney et al, 1987;Ceibrá et al, 2011;Losantos et al, 2017), and fractional crystallization (Luhr and Carmichael, 1985;Johnson et al, 2008). The origin of more felsic magmas in the MGVF has been related to the crystallization of mafic magmas and the assimilation of middle-crust lithologies (Ownby et al, 2011), and to the assimilation of upper-crust granites favored by extensionaltranstensional tectonics (Pérez-Orozco et al, 2018).…”

Section: Geologic Backgroundmentioning

confidence: 99%

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Silicic magmas in the Michoacán-Guanajuato Volcanic Field: an overview about plumbing systems, crustal storage and genesis processes

Sosa-Ceballos¹,

Boijseauneau-López²,

Pérez-Orozco³

et al. 2021

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The origin of silicic rocks in the Michoacán-Guanajuato volcanic field (MGVF) has been understudied since the volcanic field attracted the attention of researchers. Using geochemical, petrological and structural data from the literature, here we propose a model for the origin of silicic magmas. We found that all volcanic rocks known to date in the MGVF can be divided in 40 % andesite, 33 % basaltic andesite, 15 % basalt, 2 % trachybasalt to trachyandesite, and 10 % dacite-rhyolite. The structural systems that deformed the crust in the MGVF are NNW-SSE-oriented normal faults of the Taxco-San Miguel de Allende fault system, developed during the Oligocene, and the Morelia-Acambay fault system consisting of ENE-SSW to E-W sinistral strike-slip faults developed during the Oligocene-Miocene. In addition to bibliographic data, we present a gravimetric-magnetometric model to investigate the characteristics of the local basement where magmas acquire their final silicic composition, and a seismic tomography model to investigate the deep plumbing system that contribute to form the silicic rocks emplaced on the surface. The only report of assimilation experiments we found in the MGVF literature suggest that plagioclase and pyroxene are more easily digested than quartz by hotter magmas. The digestion of these mineral phases has a direct consequence on the generation of dacites and rhyolites. We propose that regardless of the genesis of andesitic melts, such intermediate magmas arrive to the upper-crust and are forced to evolve within local compression zones where they melt the local granitic basement and form crystal mushes. The compositional variability of silicic rocks in the MGVF is a consequence of the variable mixing between the intermediate magmas and the granitic partial melts.

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Section: Discussionmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: Geologic Backgroundmentioning

confidence: 99%

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Silicic magmas in the Michoacán-Guanajuato Volcanic Field: an overview about plumbing systems, crustal storage and genesis processes

Sosa-Ceballos¹,

Boijseauneau-López²,

Pérez-Orozco³

et al. 2021

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“…Some others, however, seems to be the result of magmas detachment directly from the asthenosphere (e.g. [74]), as it also seems to occur in the Acigöl rhyolite field in Anatolia, Turkey [48], where interesting effusive volcano geoforms exist.…”

Section: Examplesmentioning

confidence: 99%

Effusive Monogenetic Volcanism

Murcia¹,

Németh²

2021

Updates in Volcanology - Transdisciplinary Nature of Volcano Science

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The study of monogenetic volcanism around Earth is rapidly growing due to the increasing recognition of monogenetic volcanic edifices in different tectonic settings. Far from the idea that this type of volcanism is both typically mafic and characteristic from intraplate environments, it occurs in a wide spectrum of composition and geological settings. This volcanism is widely known by the distinctive pyroclastic cones that represent both magmatic and phreatomagmatic explosive activity; they are known as scoria or spatter cones, tuff cones, tuff rings, maars and maar-diatremes. These cones are commonly associated with lava domes and usually accompanied by lava flows as part of their effusive eruptive phases. In spite of this, isolated effusive monogenetic emissions also appear around Earth’s surface. However, these isolated emissions are not habitually considered within the classification scheme of monogenetic volcanoes. Along with this, many of these effusive volcanoes also contrast with the belief that this volcanism is indicative of rapidly magma ascent from the asthenosphere, as many of the products are strongly evolved reflecting differentiation linked to stagnation during ascent. This has led to the understanding that the asthenosphere is not always the place that directly gives rise to the magma batches and rather, they detach from a crustal melt storage. This chapter introduces four singular effusive monogenetic volcanoes as part of the volcanic geoforms, highlights the fact that monogenetic volcanic fields can also be associated with crustal reservoirs, and outlines the processes that should occur to differentiate the magma before it is released as intermediate and acidic in composition. This chapter also provides an overview of this particular volcanism worldwide and contributes to the monogenetic comprehension for future studies.

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“…Magmas range from basaltic to rhyolitic in the MGVF, but most are andesitic (Hasenaka and Carmichael, 1987;Guilbaud et al, 2019). The majority of them have calc-alkaline signatures although alkaline OIB-types exist and occur throughout the field, probably reflecting peculiar characteristics of the mantle source (Blatter and Hammersley, 2010;Losantos et al, 2017;Guilbaud et al, 2019).…”

Section: Tectonic and Volcanic Settingmentioning

confidence: 99%

Las Cabras volcano, Michoacán-Guanajuato Volcanic Field, México: Topographic, climatic, and shallow magmatic controls on scoria cone eruptions

Guilbaud¹,

Hernández-Jiménez²,

Siebe³

et al. 2021

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Scoria cones are abundant in most volcanic fields on Earth, such as the Michoacán-Guanajuato Volcanic Field, in the central-western sector of the Trans-Mexican Volcanic Belt. However, there are few in-depth studies on their eruptive style and controlling factors, despite of their diversity in shape and composition which implies a wide range of hazards. Here, we present results of morphologic, stratigraphic, sedimentary, petrographic, and geochemical studies of the prominent Las Cabras scoria cone located west of the Zacapu lacustrine basin in the center of the Michoacán-Guanajuato Volcanic Field. This basaltic andesitic to andesitic volcano formed between 27 and 26 kyrs BP on the steep slopes (>10º) of the lava shield of El Tule volcano. Over time, its dominant eruptive style changed from Strombolian to effusive. Initial explosive activity built a 170-m-high scoria cone and deposited thick tephra fallout on the surrounding sloping terrain. Structures in the deposits indicate that early friable fine-grained tephra underwent significant erosion due to syn-eruptive heavy rain coupled with the sloping nature of the underlying ground. This erosion generated lahars that very likely reached the Zacapu lake based on the pre-eruptive topography. As the explosivity dropped, lava was emitted from the base of the cone first to the S and SE, forming a thick, viscous lobe that filled a pre-existing E-W valley. The flow direction then deviated to the N and NE, to form thinner, less-viscous lobes fed from the vent by an open-channel. The lavas are covered by hummocks made of agglutinates and bombs that indicate that the eruption terminated by catastrophic collapse of the SE sector of the cone, possibly triggered by the intrusion of magma within the cone, which destabilized its downslope segment. The sudden flank failure was potentially associated with a late effusive event and the hummocks may have been carried away by the lava surge. Whole-rock chemical variations and crystal disequilibrium textures point toward a complex magma feeding system, involving mixing and mingling between different magma batches. This study shows that the formation of scoria cones on a terrain with a marked slope (>10°) has profound impacts on the eruption dynamics and related hazards due to its effect on cone stability and ash erosion. It also evidences the erosive effect of syn-eruptive rain on fine-grained tephra, especially when deposited on a slope. Finally, it reveals the complex magmatic processes that may occur in the shallow plumbing system of monogenetic andesitic volcanoes, which could be particularly important in inland areas of continental arcs.

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Petrogenesis of the alkaline and calcalkaline monogenetic volcanism in the northern sector of the Michoacán-Guanajuato Volcanic Field (Central Mexico)

Cited by 9 publications

References 70 publications

Silicic magmas in the Michoacán-Guanajuato Volcanic Field: an overview about plumbing systems, crustal storage and genesis processes

Silicic magmas in the Michoacán-Guanajuato Volcanic Field: an overview about plumbing systems, crustal storage and genesis processes

Effusive Monogenetic Volcanism

Las Cabras volcano, Michoacán-Guanajuato Volcanic Field, México: Topographic, climatic, and shallow magmatic controls on scoria cone eruptions

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