Reconciling Li and O diffusion in zircon with protracted magmatic crystal residence

León, Alejandro Cisneros de; Schmitt, Axel K.

doi:10.1007/s00410-019-1564-8

Cited by 11 publications

(3 citation statements)

References 60 publications

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“…2 Myr consistently shows low‐δ 18 O values (average +4.51‰ ± 0.24; n = 55; Figure 7a) relative to the mantle. These signatures cannot be produced by fractionation between silicate melts and minerals (Valley, 2003), nor by postcrystallization modification of oxygen isotopes in zircon by diffusion at near‐magmatic temperatures (Bindeman et al., 2018; Cisneros de León & Schmitt, 2019). Moreover, Miocene zircon xenocrysts within TBJ tephra ( n = 2) yielded mantle‐like compositions (∼+5.5‰) that differ significantly from TBJ zircon.…”

Section: Discussionmentioning

confidence: 99%

“…melts and minerals (Valley, 2003), nor by postcrystallization modification of oxygen isotopes in zircon by diffusion at near-magmatic temperatures (Bindeman et al, 2018;Cisneros de León & Schmitt, 2019). Moreover, Miocene zircon xenocrysts within TBJ tephra (n = 2) yielded mantle-like compositions (∼+5.5‰) that differ significantly from TBJ zircon.…”

Section: Multicomponent Assimilation In Tb Magma Genesismentioning

confidence: 96%

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Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador)

León

Schmitt

Kutterolf

et al. 2021

Geochem Geophys Geosyst

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The Tierra Blanca (TB) eruptive suite comprises the last four major eruptions of Ilopango caldera in El Salvador (≤45 ka), including the youngest Tierra Blanca Joven eruption (TBJ; ∼106 km 3 ): the most voluminous event during the Holocene in Central America. Despite the protracted and productive history of explosive silicic eruptions at Ilopango caldera, many aspects regarding the longevity and the prevailing physicochemical conditions of the underlying magmatic system remain unknown. Zircon 238 U-230 Th geochronology of the TB suite (TBJ, TB2, TB3, and TB4) reveals a continuous and overlapping crystallization history among individual eruptions, suggesting persistent melt presence in thermally and compositionally distinct magma reservoirs over the last ca. 80 kyr. The longevity of zircon is in contrast to previously determined crystallization timescales of <10 kyr for major mineral phases in TBJ. This dichotomy is explained by a process of rhyolitic melt segregation from a crystal-rich refractory residue that incorporates zircon, whereas a new generation of major mineral phases crystallized shortly before eruption. Ti-in-zircon temperatures and amphibole geothermobarometry suggest that rhyolitic melt was extracted from different storage zones of the magma reservoir as indicated by distinct but synchronous thermochemical zircon histories among the TB suite eruptions. Zircon from TBJ and TB2 suggests magma differentiation within deeper and hotter parts of the reservoir, whereas zircon from TB3 and TB4 instead hints at crystallization in comparatively shallower and cooler domains. The assembly of the voluminous TBJ magma reservoir was also likely enhanced by cannibalization of hydrothermally altered components as suggested by low-δ 18 O values in zircon (+4.5 ± 0.3‰).

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Section: Discussionmentioning

confidence: 99%

Section: Multicomponent Assimilation In Tb Magma Genesismentioning

confidence: 96%

Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador)

León

Schmitt

Kutterolf

et al. 2021

Geochem Geophys Geosyst

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“…Like the famous Hindu proverb of the blind men and the elephant, these disparate views expose that our interpretations may be limited by the parts of the magmatic system that is sampled by the eruption and the tools being used 12,13 . Given that magmatic systems being compared range at least three or four orders of magnitude in size and are proportionally thermally and rheologically heterogeneous, the interpretations of crystal-scale petrochronology are likely to be non-unique [14][15][16] .…”

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confidence: 99%

Resurgence initiation and subsolidus eruption of cold carapace of warm magma at Toba Caldera, Sumatra

Mucek

Danišík

Silva

et al. 2021

Commun Earth Environ

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Supervolcanoes like Toba Caldera, Sumatra, produce the largest eruptions on Earth. However, the magmatic conditions and processes during the period of recovery after catastrophic supereruptions, known as resurgence, are poorly understood. Here we use Bayesian statistical analysis and inverse thermal history modelling of feldspar argon-argon and zircon uranium-thorium/helium ages to investigate resurgence after the 74-thousand-year-old Youngest Toba Tuff eruption. We identify a discordance of up to around 13.6 thousand years between older feldspar and younger zircon ages. Our modelling suggests cold storage of feldspar antecrysts prior to eruption for a maximum duration of around 5 and 13 thousand years at between 280 °C and 500 °C. We propose that the solidified carapace of remnant magma after the Youngest Toba Tuff eruption erupted in a subsolidus state, without being thermally remobilized or rejuvenated. Our study indicates that resurgent uplift and volcanism initiated approximately 5 thousand years after the climactic caldera forming supereruption.

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Sources of Li isotope bias during SIMS analysis of standard glasses

Denny,

Zimmer,

Cunningham

et al. 2024

Chemical Geology

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Reconciling Li and O diffusion in zircon with protracted magmatic crystal residence

Cited by 11 publications

References 60 publications

Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador)

Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador)

Resurgence initiation and subsolidus eruption of cold carapace of warm magma at Toba Caldera, Sumatra

Sources of Li isotope bias during SIMS analysis of standard glasses

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