Low-δ18O Rhyolites from Yellowstone: Magmatic Evolution Based on Analyses of Zircons and Individual Phenocrysts

Bindeman, I. N.; Valley, John W.

doi:10.1093/petrology/42.8.1491

Cited by 263 publications

(116 citation statements)

References 61 publications

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“…The Headquarters ( fig. 33) (Hildreth, 1984;Bindeman and Valley, 2001), radiogenic lead-strontium isotope compositions (Hildreth and others, 1991), and sanidine Ar/Ar dates (Rivera and others, 2017) consistent with the latter flow underlying the former (Christiansen, 2001 (Rivera and others, 2017). These flows, and the newly identified low-δ 18 O Sheridan Reservoir flow that is located to the north and yields a uranium-lead zircon crystallization date of 2.07±0.19 Ma (Watts and others, 2011), appear to have vented from within the HRT caldera (Watts and others, 2011).…”

Section: Day 2 Road Logmentioning

confidence: 84%

“…The oxygen isotope compositions of Harlequin Lake flow quartz and sanidines are somewhat lower than for the Mount Haynes flow, but elevated relative to second cycle rhyolites (Troch and others, 2017). The average oxygen isotope compositions of Mount Haynes quartz indicate equilibrium melt in the range of normal (+5.8-6.3‰) rhyolitic melts, with values resembling those for the LCT, and elevated relative to second cycle and older Mount Jackson Rhyolite flows (Hildreth and others, 1984;Bindeman and Valley, 2001;Troch and others, 2017). Sanidines from the Harlequin Lake flow have lead isotope compositions resembling those from the MFT and other second cycle rhyolites, whereas the Mount Haynes flow sanidines more closely resemble the LCT (Troch and others, 2017), which together with the oxygen isotopes suggest that these flows mark a transition in the petrology characterizing the second and third cycles.…”

Section: Distance From the Shoulder Of The Road And Be Careful If Youmentioning

confidence: 96%

“…The Upper Basin Member rhyolites can be divided into the early Upper Basin Member rhyolites and the late Upper Basin Member rhyolites. The early Upper Basin Member rhyolites, which erupted between 516±14 ka and 479±20 ka (Gansecki and others, 1996) Hildreth and others, 1984;Bindeman and Valley, 2001;Bindeman and others, 2008;Pritchard and Larson, 2012) and zircon populations with heterogeneous δ 18 O values (Bindeman and Valley, 2001;Bindeman and others, 2008). Additionally, each Upper Basin Member rhyolite has a distinct trace-element composition relative to the other Upper Basin Member rhyolites (Girard and Stix, 2009).…”

Section: Third Cycle Rhyolitic Volcanismmentioning

confidence: 99%

“…18 O values of about +4‰ (Hildreth and others, 1984;Bindeman and Valley, 2001), suggesting a melt value of +3.5‰ and a drop of ~3-4‰ below the normal δ 18 O values characterizing the HRT (Hildreth and others, 1984;Bindeman and Valley, 2001). The remarkably low δ 18 O of these flows indicates parental magma with a large component of hydrothermally altered shallow crust (Hildreth and others, 1984;Bindeman and Valley, 2001;Bindeman and others, 2008).…”

Section: Flow Yields δmentioning

confidence: 99%

“…The remarkably low δ 18 O of these flows indicates parental magma with a large component of hydrothermally altered shallow crust (Hildreth and others, 1984;Bindeman and Valley, 2001;Bindeman and others, 2008). Based on the presence of zircon xenocrysts in the Blue Creek flow (described at the next stop), at least some of this hydrothermally altered crust may have been intracaldera rhyolite related to the HRT (Bindeman and others, 2008 (Bindeman and Valley, 2001).…”

Section: Flow Yields δmentioning

confidence: 99%

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A field trip guide to the petrology of Quaternary volcanism on the Yellowstone Plateau

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Section: Day 2 Road Logmentioning

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Section: Distance From the Shoulder Of The Road And Be Careful If Youmentioning

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Section: Third Cycle Rhyolitic Volcanismmentioning

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A field trip guide to the petrology of Quaternary volcanism on the Yellowstone Plateau

Stelten¹,

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Cooper³

2017

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Crystallization kinetics of rhyolitic melts using oxygen isotope ratios

Befus

2016

Geophysical Research Letters

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Crystals provide the means to understand igneous systems, but natural constraints on crystallization kinetics are rare because thermal conditions and crystallization timescales are typically unknown. Oxygen isotope ratios in quartz and alkali feldspar crystals in spherulites provide a natural record of the temperature interval of crystallization and crystal growth rates in rhyolitic melts. Oxygen isotope compositions in both phases change progressively with position from the spherulite core to rim. Quartz δ18O increases from 5.0 ± 0.3‰ in the core to 5.6 ± 0.3‰ at the rims, whereas alkali feldspar decreases from 3.7 ± 0.4‰ in the core to 2.7 ± 0.9‰ at the rims. Fractionation therefore increases from 1.3 ± 0.7‰ in the cores to 2.9 ± 1.1‰ at the rims. Oxygen isotope thermometry tracks crystallization temperature with position. Spherulites nucleate at 578 ± 160°C and continue to grow until 301 ± 88°C. The in situ analyses demonstrate that spherulites self‐contain a record of their thermal history and that of the host lava.

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Fitful and protracted magma assembly leading to a giant eruption, Youngest Toba Tuff, Indonesia

Reid

Vazquez

2017

Geochem Geophys Geosyst

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The paroxysmal eruption of the 74 ka Youngest Toba Tuff (YTT) of northern Sumatra produced an extraordinary 2800 km 3 of nonwelded to densely welded ignimbrite and coignimbrite ashfall. We report insights into the duration of YTT magma assembly obtained from ion microprobe U-Th and U-Pb dates, including continuous age spectra over >50% of final zircon growth, for pumices and a welded tuff spanning the compositional range of the YTT. A relatively large subpopulation of zircon crystals nucleated before the penultimate caldera-related eruption at 501 ka, but most zircons yielded interior dates 100-300 ka thereafter. Zircon nucleation and growth was likely episodic and from diverse conditions over protracted time intervals of >100 to >500 ka. Final zircon growth is evident as thin rim plateaus that are in Th/U chemical equilibrium with hosts, and that give crystallization ages within tens of ka of eruption. The longevity and chemical characteristics of the YTT zircons, as well as evidence for intermittent zircon isolation and remobilization associated with magma recharge, is especially favored at the cool and wet eutectoid conditions that characterize at least half of the YTT, wherein heat fluxes could dissolve major phases but have only a minor effect on larger zircon crystals. Repeated magma recharge may have contributed to the development of compositional zoning in the YTT but, considered together with limited allanite, quartz, and other mineral dating and geospeedometry, regular perturbations to the magma reservoir over >400 ka did not lead to eruption until 74 ka ago.

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Low-δ18O Rhyolites from Yellowstone: Magmatic Evolution Based on Analyses of Zircons and Individual Phenocrysts

Cited by 263 publications

References 61 publications

A field trip guide to the petrology of Quaternary volcanism on the Yellowstone Plateau

A field trip guide to the petrology of Quaternary volcanism on the Yellowstone Plateau

Crystallization kinetics of rhyolitic melts using oxygen isotope ratios

Fitful and protracted magma assembly leading to a giant eruption, Youngest Toba Tuff, Indonesia

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