A window on mantle-derived magmas within the Central Andes: eruption style transitions at Cerro Overo maar and La Albóndiga lava dome, northern Chile

Ureta, Gabriel; Németh, Károly; Aguilera, Felipe; Zimmer, Martin; Menzies, Andrew

doi:10.1007/s00445-021-01446-3

Cited by 10 publications

(3 citation statements)

References 77 publications

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“…Unlike previous models claiming a progressive deepening of the explosion locus and, relevantly, the crater formation (Lorenz, 1986), recent experiment-based studies of maar eruption dynamics favor a vertical (with respect to the scaled depth (SD), an empirical ratio between depth and energy of the explosion; Goto et al, 2001) and lateral movement of explosions and suggest that pre-existing topography (Sweeney et al, 2018;Acocella, 2021) and substrata lithology are the main factors affecting maar formations (Graettinger et al, 2015;Valentine et al, 2017;Sweeney et al, 2018). These factors have been tested by an increasing number of field observations, mostly on mafic maars (Amin and Valentine, 2017;Chako-Tchamabé et al, 2020;De León-Barragán et al, 2020;Ureta et al, 2021), which are significantly more common as compared to their felsic counterparts (Graettinger, 2018). There is still less information on felsic maars due to the limited exposure (Borrero et al, 2017), and hence, their characteristics have been mostly adopted by tuff rings (Ross et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

New findings on compositionally distinct maar volcanoes: A case study from Acıgöl (Nevşehir) caldera (Central Anatolia, Turkey)

et al. 2022

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Recent experiments have largely reshaped our knowledge of maar volcanism. A new evolutionary model promoting the role of explosion depth and vent migration during the formation of maars has provided an alternative approach to previous models. Despite a few attempts to test this model with real cases, there is still a need for field-based studies exploring the depositional characteristics of maars to better understand the factors affecting the model constraints. More investigations on less known felsic maars are required to elucidate the possible differences from their more common mafic counterparts. Here, we explore compositionally distinct monogenetic clusters within the Acıgöl caldera (NW of Central Anatolian Volcanic Province, CAVP), with four felsic maars (İnallı, Kalecitepe, Acıgöl, and Korudağ) and one mafic maar (İcik). Our field observations reveal a successive formation between rhyolitic maars and adjacent lava domes. The mugearitic İcik coalescent maar and the adjacent scoria cone are synchronously formed, which is disclosed by the intercalation of the maar and scoria cone deposits. The geochemistry of the maar juveniles suggests a parental basaltic magma source that has been possibly differentiated by varying degrees of fractional crystallization. Our findings identify the main factors in maar formation (i.e., optimum scaled depth-OSD, water-magma interaction, and basement lithology). We also determine some differences between the felsic and mafic maars in the region, such as higher juvenile content, less amount of sedimentary structure, and a clear transition from phreatomagmatic to magmatic explosions through the end of stratigraphy. All these reflect the complexity of maars, mainly formed by different depths of explosions that occurred in the shallowest few hundred meters rather than a systematic incremental decrease of the eruption locus. Further geophysical and geochronological studies will complete our proposed evolutionary model for the youngest monogenetic activity in the Acıgöl caldera that would also warrant volcanic hazard assessment due to the presence of low-velocity anomalies, shallow Curie depths, and prevalent geothermal activity.

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Section: Introductionmentioning

confidence: 99%

New findings on compositionally distinct maar volcanoes: A case study from Acıgöl (Nevşehir) caldera (Central Anatolia, Turkey)

et al. 2022

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“…Additionally, several ZVF maars are proceeded by cinder cones, denoting a shift in the eruption dynamics from strombolian to phreatomagmatic. This dynamic behavior of phreatomagmatic eruptions/ systems has been observed in several places around the world, including hyper-arid regions such as the Atacama Desert in Chile (Ureta et al, 2021a(Ureta et al, , 2021b. Ultimately, phreatomagmatic activity in these regions seems to be controlled by water availability and water table depth (Ureta et al, 2021b).…”

Section: Geomorphology and Morphometrymentioning

confidence: 85%

Tectonic controls on geomorphology and spatial distribution of monogenetic volcanoes in the Central Southern Volcanic Zone of the Andes (Argentina)

et al. 2022

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“…This dynamic behavior of phreatomagmatic eruptions/systems has been observed in several places around the world, including hyper-arid regions such as the Atacama Desert in Chile (Ureta et al, 2021a, Submitted to Geomorphology 2021b). Ultimately, phreatomagmatic activity in these regions seems to be controlled by water availability and water table depth (Ureta et al, 2021b). Submitted to Geomorphology…”

Section: Geomorphology and Morphometrymentioning

confidence: 99%

Tectonic controls on geomorphology and spatial distribution of monogenetic volcanoes in the Central Southern Volcanic Zone of the Andes (Argentina)

Santos¹,

Sommer²,

Haag³

et al. 2022

Preprint

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Monogenetic volcanoes are among the most common volcanic landforms on Earth. The morphology and distribution of small volcanoes can provide important information about eruption dynamics and tectonics. The Southern Volcanic Zone of the Andes (CSVZ) comprises one of the most active magmatic regions on Earth. Characterized by the presence of polygenetic volcanoes and calderas in a complex tectonic setting, this region also hosts hundreds of small, back-arc monogenetic volcanoes. In this contribution, we apply a Geographic Information System (GIS) that combines imagery data and digital elevation models to establish the first comprehensive dataset of monogenetic volcanoes in the CSVZ (38° to 40° S), exploring their eruption dynamics and relationship to tectonic and structural processes. Combining spatial analysis and geomorphological observations, we identify the presence of 356 monogenetic volcanoes distributed into nine clusters, now grouped in the Zapala Volcanic Field (ZVF). The ZVF is marked by the predominance of cinder cones (80%) followed by phreatomagmatic volcanoes (20%), suggesting some influence of external water in the eruption dynamics. Generally, monogenetic vents present a clear association with local and regional lineaments, suggesting a strong structural control on the occurrence of the monogenetic deposits. The higher vent densities are observed in the southern Loncopué Though, an important extensional feature related to tearing of the subducted Nazca plate underneath the South American Plate. Morphometric parameters of cinder cones indicate variable stress orientations in the CSVZ that possibly result from the oblique tectonics in the region. From north to south, the maximum principal stress rotates from NE-SW to E-W and becomes progressively less constrained as it distances from the current magmatic arc. Based on the relative ages, we map the evolution of monogenetic volcanism through time. Our results suggest a waning in the monogenetic activity in ZVF over time. When compared to monogenetic fields in the Central Andes, the ZVF is marked by higher vent densities and number of phreatomagmatic landforms, with the absence of lava domes. This ultimately reflects the contrasting crustal structure and climate conditions of these two regions.

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A window on mantle-derived magmas within the Central Andes: eruption style transitions at Cerro Overo maar and La Albóndiga lava dome, northern Chile

Cited by 10 publications

References 77 publications

New findings on compositionally distinct maar volcanoes: A case study from Acıgöl (Nevşehir) caldera (Central Anatolia, Turkey)

New findings on compositionally distinct maar volcanoes: A case study from Acıgöl (Nevşehir) caldera (Central Anatolia, Turkey)

Tectonic controls on geomorphology and spatial distribution of monogenetic volcanoes in the Central Southern Volcanic Zone of the Andes (Argentina)

Tectonic controls on geomorphology and spatial distribution of monogenetic volcanoes in the Central Southern Volcanic Zone of the Andes (Argentina)

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