Evidence for superhydrous primitive arc magmas from mafic enclaves at Shiveluch volcano, Kamchatka

Goltz, Andrea; Krawczynski, M. J.; Gavrilenko, M.; Gorbach, N. V.; Ruprecht, Philipp

doi:10.1007/s00410-020-01746-5

Cited by 32 publications

(18 citation statements)

References 111 publications

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“…Natural samples in which amphibole was analyzed were all erupted from Shiveluch Volcano in the Kamchatkan arc. For full descriptions of samples besides the 3600 BP tephra, the reader is directed to Goltz et al (2020); descriptions of the tephra may be found in Volynets et al (1997) and Ponomareva et al (2007). To summarize, all but samples 04L, 16B, and the 3600 BP tephra are amphibole and olivine-phyric quenched liquid cognate xenoliths (mafic enclaves) with basaltic to basaltic andesite bulk compositions that were erupted in pyroclastic flows mostly composed of andesite.…”

Section: Fe 3+ and Fe 2+ Partitioning In Amphibolementioning

confidence: 99%

“…The 3600 BP tephra is one of two basaltic tephra erupted from Shiveluch and contains amphibole and phlogopite phenocrysts. The composition of this tephra has been hypothesized to be representative of a magmatic composition parental to the less magnesian mafic enclaves (e.g., Volynets et al, 1997;Goltz et al, 2020). Both the tephra and mafic enclaves show evidence for co-existence of high Mg# amphibole (i.e., Mg#>74) and high forsterite olivine (i.e., Fo 90-92 ), which implies crystallization from a super-hydrous primary magma, with an estimated primary magmatic water content ranging up to 10 wt% H 2 O. Magmas at Shiveluch are primarily products of flux melting of the mantle overlying the subducting Pacific plate.…”

Section: Xafs Measurements Of Amphiboles In Natural Samplesmentioning

confidence: 99%

“…Samples with higher f O2 (i.e., all analyzed mafic enclaves and amphibolebearing cumulate 04L) may reflect actual variability in magmatic f O2 caused by mantle source We first consider the notion that the range in calculated f O2 in our sample set is reflective of real variability in magmatic f O2 at Shiveluch. The potential contributions of mantle source heterogeneity, slab fluids, and crustal processes (i.e., fractional crystallization and crustal assimilation) are evaluated for these samples in the context previously published geochemical and petrological measurements and observations of these samples (Goltz et al, 2020 for enclaves and cumulates and Ponomareva et al, 2007 andVolynets et al, 1997 for the tephra).…”

Section: Application Of K Fe3+/fe2+ As An Oxybarometermentioning

confidence: 99%

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Experimental calibration of an Fe3+/Fe2+-in-amphibole oxybarometer and its application to shallow magmatic processes at Shiveluch Volcano, Kamchatka

Goltz

Krawczynski

McCanta

et al. 2022

American Mineralogist

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Oxygen fugacity is an important but difficult parameter to constrain for primitive arc magmas. In this study, the partitioning behavior of Fe3+/Fe2+ between amphibole and glass synthesized in piston-cylinder and cold-seal apparatus experiments is developed as an oxybarometer, applicable to magmas ranging from basaltic to dacitic composition. The partitioning of Fe2+ is strongly dependent on melt polymerization; the relative compatibility of Fe2+ in amphibole decreases with increasing polymerization. The Fe2+/Mg distribution coefficient between amphibole and melt is a relatively constant value across all compositions and is, on average, 0.27. The amphibole oxybarometer is applied to amphibole in mafic enclaves, cumulates, and basaltic tephra erupted from Shiveluch volcano in Kamchatka with measured Fe3+/FeTotal. An average Fe3+/Fe2+ amphibole-glass distribution coefficient for basalt is used to convert the Fe3+/FeTotal of amphibole in samples from Shiveluch to magmatic oxygen fugacity relative to NNO. The fO2 of primitive melts at the volcano is approximately NNO+2 and is faithfully recorded in amphibole from an amphibole-rich cumulate and the basaltic tephra. Apparently, higher fO2 recorded by amphibole in mafic enclaves likely results from partial dehydrogenation of amphibole during residence in a shallow andesite storage region. We identify three pulses of mafic magma recharge within two weeks of, a month before, and two to three months before the eruption and find that, at each of these times, the host andesite was recharged by at least two magmas at varying stages of differentiation. Application of the amphibole oxybarometer not only gives insight into magmatic fO2 but also potentially details of shallow magmatic processes.

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Section: Fe 3+ and Fe 2+ Partitioning In Amphibolementioning

confidence: 99%

Section: Xafs Measurements Of Amphiboles In Natural Samplesmentioning

confidence: 99%

Section: Application Of K Fe3+/fe2+ As An Oxybarometermentioning

confidence: 99%

See 1 more Smart Citation

Experimental calibration of an Fe3+/Fe2+-in-amphibole oxybarometer and its application to shallow magmatic processes at Shiveluch Volcano, Kamchatka

Goltz

Krawczynski

McCanta

et al. 2022

American Mineralogist

Self Cite

View full text Add to dashboard Cite

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“…In arcs, H 2 O contents inferred from melt inclusions or mineral hygrometers are sometimes used to place first order constraints on saturation pressures (e.g. Plank et al, 2013;Blundy & Cashman, 2005;Goltz et al, 2020). However, even in very H 2 O-rich melts, the non-vertical orientation of isobars at high H 2 O contents indicates that CO contents still have an important role in determining the saturation pressure (Fig.…”

Section: Relationship Between Saturation Pressure and Dissolved Co 2 Contentmentioning

confidence: 99%

VESIcal Part II: A critical approach to volatile solubility modelling using an open-source Python3 engine

Wieser¹,

Iacovino²,

Matthews³

et al. 2022

Preprint

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Accurate models of H2O and CO2 solubility in silicate melts are vital for understanding volcanic plumbing systems. These models are used to estimate the depths of magma storage regions from melt inclusion volatile contents, investigate the role of volatile exsolution as a driver of volcanic eruptions, and track the degassing paths followed by magma ascending to the surface. However, despite the large increase in the number of experimental constraints over the last two decades, many recent studies still utilize the earlier generation of models, which were calibrated on experimental datasets with restricted compositional ranges. This may be because many of the available tools for more recent models require large numbers of input parameters to be hand-typed (e.g., temperature, concentrations of H2O, CO2, and 8--14 oxides), making them difficult to implement on large datasets. Here, we use a new open-source Python3 tool, VESIcal, to critically evaluate the behaviours and sensitivities of different solubility models for a range of melt compositions. Using literature datasets of andesitic-dacitic experimental products and melt inclusions as case studies, we illustrate the importance of evaluating the calibration dataset of each model. Finally, we highlight the limitations of particular data presentation methods such as isobar diagrams, and provide suggestions for alternatives, and best practices regarding the presentation and archiving of data. This review will aid the selection of the most applicable solubility model for different melt compositions, and identifies areas where additional experimental constraints are required

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“…The average temperature over the twentieth century was 1002 ± 22 °C. b The temperature range at Mayon calculated using multiple mineral thermometers from Putirka (2008) and separated in core + whole rock (WR), and rim + matrix glass (MG) Krawczynski et al 2012), which can be easily achieved at deeper storage zones (Melekhova et al 2017;Goltz et al 2020). We used the hornblende composition reported in Newhall (1977) and the geobarometer (Eq.…”

Section: Calculated Pressure-geobarometrymentioning

confidence: 99%

A petrological and conceptual model of Mayon volcano (Philippines) as an example of an open-vent volcano

Ruth

Costa

2021

Bull Volcanol

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Mayon is a basaltic andesitic, open-vent volcano characterized by persistent passive degassing from the summit at 2463 m above sea level. Mid-size (< 0.1 km3) and mildly explosive eruptions and occasional phreatic eruptions have occurred approximately every 10 years for over a hundred years. Mayon’s plumbing system structure, processes, and time scales driving its eruptions are still not well-known, despite being the most active volcano in the Philippines. We investigated the petrology and geochemistry of its crystal-rich lavas (~ 50 vol% phenocrysts) from nine historical eruptions between 1928 and 2009 and propose a conceptual model of the processes and magmatic architecture that led to the eruptions. The whole-rock geochemistry and mineral assemblage (plagioclase + orthopyroxene + clinopyroxene + Fe-Ti oxide ± olivine) of the lavas have remained remarkably homogenous (54 wt% SiO2, ~ 4 wt% MgO) from 1928 to 2009. However, electron microscope images and microprobe analyses of the phenocrysts and the existence of three types of glomerocrysts testify to a range of magmatic processes, including long-term magma residence, magma mixing, crystallization, volatile fluxing, and degassing. Multiple mineral-melt geothermobarometers suggest a relatively thermally buffered system at 1050 ± 25 °C, with several magma residence zones, ranging from close to the surface, through reservoirs at ~ 4–5 km, and as deep as ~ 20 km. Diffusion chronometry on > 200 orthopyroxene crystals reveal magma mixing timescales that range from a few days to about 65 years, but the majority are shorter than the decadal inter-eruptive repose period. This implies that magma intrusion at Mayon has been nearly continuous over the studied time period, with limited crystal recycling from one eruption to the next. The variety of plagioclase textures and zoning patterns reflect fluxing of volatiles from depth to shallower melts through which they eventually reach the atmosphere through an open conduit. The crystal-rich nature of the erupted magmas may have developed during each inter-eruptive period. We propose that Mayon has behaved over almost 100 years as a steady state system, with limited variations in eruption frequency, degassing flux, magma composition, and crystal content that are mainly determined by the amount and composition of deep magma and volatile input in the system. We explore how Mayon volcano’s processes and working model can be related to other open-vent mafic and water-rich systems such as Etna, Stromboli, Villarrica, or Llaima. Finally, our understanding of open-vent, persistently active volcanoes is rooted in historical observations, but volcano behavior can evolve over longer time frames. We speculate that these volcanoes produce specific plagioclase textures that can be used to identify similar volcanic behavior in the geologic record.

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Evidence for superhydrous primitive arc magmas from mafic enclaves at Shiveluch volcano, Kamchatka

Cited by 32 publications

References 111 publications

Experimental calibration of an Fe3+/Fe2+-in-amphibole oxybarometer and its application to shallow magmatic processes at Shiveluch Volcano, Kamchatka

Experimental calibration of an Fe3+/Fe2+-in-amphibole oxybarometer and its application to shallow magmatic processes at Shiveluch Volcano, Kamchatka

VESIcal Part II: A critical approach to volatile solubility modelling using an open-source Python3 engine

A petrological and conceptual model of Mayon volcano (Philippines) as an example of an open-vent volcano

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