Experimental Study of Interaction of Carbonic Fluid with Cumulus Minerals of Ultrabasic Intrusions at 950°C and 200 MPa

Simakin, A. G.; Salova, T. P.; Shaposhnikova, O. Yu.; Исаенко, С. И.; Некрасов, А. Н.

doi:10.1134/s0869591121040068

Cited by 1 publication

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“…The existence of those reservoirs could explain two crystal mushes that evolved separately and interacted just before the eruption, rather than one single "zoned crystal mush". The Cr-Al-Fe 3+ composition of spinel inclusion in olivine phenocryst follow the oxidation trend in cumulus: increasing Fe 3+ at constant Cr composition (e.g., Simakin et al, 2021; details in Supplementary Data 3). The composition of those spinels would suggest that the interstitial melt is reduced during olivine oxidation (e.g., Knafelc et al, 2019;Simakin et al, 2021).…”

Section: Crystal-mush Within the Magma Reservoir And Crystallisation ...mentioning

confidence: 89%

“…The Cr-Al-Fe 3+ composition of spinel inclusion in olivine phenocryst follow the oxidation trend in cumulus: increasing Fe 3+ at constant Cr composition (e.g., Simakin et al, 2021; details in Supplementary Data 3). The composition of those spinels would suggest that the interstitial melt is reduced during olivine oxidation (e.g., Knafelc et al, 2019;Simakin et al, 2021). Moreover, embayments in some olivine phenocrysts suggest a disequilibrium event (presumably a heating event), which could be related to crystal mush disaggregation with interstitial melt close to water saturation (Alidibirov and Dingwell, 1996) prior the 1835 AD Osorno eruption, but it did not generate zoning patterns at the upper levels of the zoned crystal mush.…”

Section: Crystal-mush Within the Magma Reservoir And Crystallisation ...mentioning

confidence: 89%

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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.

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Section: Crystal-mush Within the Magma Reservoir And Crystallisation ...mentioning

confidence: 89%

Section: Crystal-mush Within the Magma Reservoir And Crystallisation ...mentioning

confidence: 89%

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

View full text Add to dashboard Cite

show abstract

Experimental Study of Interaction of Carbonic Fluid with Cumulus Minerals of Ultrabasic Intrusions at 950°C and 200 MPa

Cited by 1 publication

References 39 publications

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

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

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