Along-strike variability of primitive magmas (major and volatile elements) inferred from olivine-hosted melt inclusions, southernmost Andean Southern Volcanic Zone, Chile

Weller, Derek; Stern, Charles R.

doi:10.1016/j.lithos.2017.11.009

Cited by 14 publications

(5 citation statements)

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“…At large, long-lived stratovolcanoes, mafic rocks can be either produced by water-poor (~1 wt.%) tholeiitic magmas, as in Osorno or Antuco (Martínez et al, 2018;Bechon et al, 2022), or by highly watersaturated magmas, as in Nevado de Longaví, Calbuco, Huequi, and Mentolat, which are probably the only ones whose products document hornblende and garnet fractionation from mafic magmas (Watt et al, 2011;Hickey-Vargas et al, 2016;Weller and Stern, 2018;Sellés et al, 2022). The presence of hydrous minerals indicates relatively high-water contents in the subarc mantle, probably due to the subduction of a locally fractured oceanic crust (Weller and Stern, 2018;Sellés et al, 2022). At stratovolcanoes, mixing between different magma batches has influenced the evolution of their magma suites (e.g., Mella, 2009;Schindlbeck et al 2014;Boschetty et al, 2022).…”

Section: Petrogenesismentioning

confidence: 99%

“…The Liquiñe Ofqui Fault System (LOFS) and the major Andean Transversal Faults (ATFs) are also indicated. Thick black dotted solid lines in the Nazca plate represent fracture zones (Weller and Stern, 2018). Plate motion rates and azimuths (arrows) from Kendrick et al (2003) a refreshed compendium of peer-reviewed sources and the learnings arisen from SVZ recent eruptions based on 328 contributions cited in this work.…”

Section: Introductionmentioning

confidence: 99%

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The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

Romero,

Vergara-Pinto,

Forte

et al. 2024

andgeo

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The Andean Southern Volcanic Zone (SVZ) concentrates many of the most active volcanoes of the Andean continental arc, as well as the region’s most recent and impactful volcanic eruptions. In this contribution, we briefly revise the general characteristics of the SVZ volcanism and provide a synthesis of the scientific findings related to the latest volcanic eruptions (430 peer-reviewed publications with over 9,000 citations, with large-magnitude (VEI 4-5) eruptions being the most studied. Our study shows that SVZ research has been primarily focused on environmental and atmospheric impacts (29%), eruption descriptions and physical volcanology (20%), volcanic hazard and risk assessments (15%), and other investigations complementary to volcanology. Whereas the least silicic eruptions (e.g., Llaima 2008-2009 and Villarrica 2015) shed light on magma replenishment and degassing dynamics controlling eruption styles, intermediate eruptions (andesitic-dacitic) offered clues on either rapid or slow eruption initiation, with relevant findings on phreatic-to-magmatic style transitions and eruption triggering mechanisms. On the other hand, silicic (i.e., rhyolite-rhyodacite) eruptions provided unique observations on rapid magma ascent, high-rate magma extrusion, rheology, fragmentation processes, and style transitions. These recent eruptions have also inspired a new generation of tephrochronological, tephrostratigraphical, and physical volcanology studies, aimed at assessing the long-term (kyr-scale) evolution of the volcanic systems and their associated hazards. We debate how the knowledge gained from research and the long-term human coexistence with volcanoes are relevant to reducing volcanic risk in the SVZ. Finally, we discuss how challenges and opportunities emerging from other disciplines can complement our understanding of volcanism in this active region.

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Section: Petrogenesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

Romero,

Vergara-Pinto,

Forte

et al. 2024

andgeo

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“…is called hydrothermal alteration (Stefánsson and Kleine, 2017;Parendo et al, 2017;Kitajima et al, 2010). The intense hydrothermal alteration transforms peridotite into serpentinite on or near the surface of the subducted slab (Singer et al, 2013;Weller and Stern, 2018;Manea et al, 2014;Schlaphorst et al, 2016).…”

Section: Influence Of Fracture Zone Subduction On Arc Magma Productiomentioning

confidence: 99%

“…When the water-rich (13 wt %) and light peridotite rises to a depth of 80-120 km, it will decompose due to decompression (Zheng et al, 2016). Therefore, the fluids produced by the fractured slab are more than those released by the normal slab dehydration (Singer et al, 2013;Weller and Stern, 2018;Manea et al, 2014;Wehrmann et al, 2014;Singer et al, 2007;Schlaphorst et al, 2016). More fluids flow into the mantle wedge and promote more mantle wedge melting (Fig.…”

Section: Influence Of Fracture Zone Subduction On Arc Magma Productiomentioning

confidence: 99%

Aleutian island arc magma production rates and mechanisms

Bai

Zhang

Dong

et al. 2019

Preprint

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Abstract. The variation in island arc magma production rates and their influencing mechanisms are of great significance since island arc magma is considered a main source of continental crust growth. The island arc magma directly originates from the molten mantle wedge, and the mantle melting is driven by fluids or melts from the subducted slab. Slab dehydration flux mainly depends on the slab thermal structures, and subducted slab melting requires a sufficiently high temperature. For the Aleutian subduction system, the subducted Pacific Plate has diverse thermal structures due to the existing fracture zones, ridges and slab window, so it is an ideal region for arc magma production rate research. However, the previous estimations are based on seismic profiles that only provide magma production rates at specific regions of the Aleutian arc, and these results are controversial. Here, we design a magma production rate estimation method based on gravity inversion constrained by deep seismic profiles. The first overview map of magma production rates along the Aleutian arc strike demonstrates that the magma production rates have the same trend as the slab dips, and the peaks correspond to the subduction of the fracture zones and ridges. The potential mechanisms for these correlations are as follows: (1) Slab water flux at subarc depths increases with increasing slab dip. More fluid flux would induce more mantle melting, and so the arc magma production rates are increased. (2) Water-rich serpentine is formed by hydrothermal alteration on or near the surface of the subducted slab when there are fracture zones. Serpentine decomposition at a depth of 80–120 km releases fluids in addition to the fluids released during normal slab dehydration. Therefore, more fluids induce more mantle melting and correspond a larger magma production rate. (3) The slab located in the Emperor Seamounts has a relatively high temperature and is also weak, so its melting is easier. Similarly, more slab melt means more mantle melt and a higher island arc magma production rate.

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“…Besides whole-rock chemistry, recent articles (e.g., Ruth et al, 2018;Weller and Stern, 2018;Morgado et al, 2019a;Couperthwaite et al, 2020;Tassara et al, 2020) have also considered melt inclusion composition, mineral chemistry, and diffusion chronometry in volcanic rocks, which have placed observed chemical variabilities in a geological context, permitting events occurring during the magmatic evolution to be identified. Particularly, melt inclusion compositions, which have been used to constrain pressure of the magmatic storage and water dissolved in melt, could undergo significant reequilibration after recrystallisation in the rims and volatile loss, leading to misinterpretations of magmatic processes.…”

Section: Introductionmentioning

confidence: 99%

The Magmatic Evolution and the Regional Context of the 1835 AD Osorno Volcano Products (41°06’S, Southern Chile)

Morgado

Morgan

Harvey

et al. 2022

Journal of Petrology

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Osorno volcano (41°06’S, 72°20’W) is a composite stratovolcano of the Central Southern Volcanic Zone of the Chilean Andes. It is the southernmost member of a NE–SW trending alignment of volcanic edifices including La Picada and Puntiagudo volcanoes and the Cordón Cenizos chain. According to contemporary descriptions recorded by Charles Darwin in 1835, two eruptive events occurred: the first during January–February, and the second during November–December 1835 and January 1836. The volcano erupted basaltic andesite lavas and tephra fall deposits (52.4 to 52.9 SiO2 wt. %) which contain phenocrysts of olivine, plagioclase, clinopyroxene, and spinel. The compositions of these phenocryst phases, together with those of olivine-hosted melt inclusions, allowed us to constrain intensive parameters for the pre-eruptive magmas. These varied from 1060 to 1140°C, with an oxygen fugacity buffer of ~ΔQFM +1.1, dissolved water concentrations of up to 5.6 wt. % (average of ~4.2 wt. %) and maximum pressures equivalent to ~7 km depth. Textural relations, such as crystal accumulations and clots, zoning in crystals and other indications of disequilibrium, lead us to infer the involvement of a crystal mush, rich in individual crystals and clots of crystals, which underwent a degree of disaggregation and entrainment into the transiting magma prior to eruption. Comparison of trace element abundances, including rare earth elements, fluid-mobile elements, and relatively fluid-immobile elements, combined with 87Sr/86Sr and 143Nd/144Nd isotope ratios, allow us to consider variations in slab-derived fluid input and the minor role of crustal contamination on the Osorno eruptive products and those from neighbouring volcanic systems. Our results suggest both a greater contribution from slab-derived fluid and a higher degree of partial melting in the systems supplying stratovolcanoes (Osorno, Calbuco, and La Picada) relative to those supplying small eruptive centres built over the major regional Liquiñe-Ofqui Fault Zone.

show abstract

Along-strike variability of primitive magmas (major and volatile elements) inferred from olivine-hosted melt inclusions, southernmost Andean Southern Volcanic Zone, Chile

Cited by 14 publications

References 50 publications

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

The Andean Southern Volcanic Zone: a review on the legacy of the latest volcanic eruptions

Aleutian island arc magma production rates and mechanisms

The Magmatic Evolution and the Regional Context of the 1835 AD Osorno Volcano Products (41°06’S, Southern Chile)

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