Probing the Accumulation History of the Voluminous Toba Magma

@article{Vazquez2004ProbingTA,
  title={Probing the Accumulation History of the Voluminous Toba Magma},
  author={Jorge A. Vazquez and M. R. Reid},
  journal={Science},
  year={2004},
  volume={305},
  pages={991 - 994}
}
The age and compositional zonation in crystals from the Youngest Toba Tuff record the prelude to Earth's largest Quaternary eruption. We used allanite crystals to date and decipher this zoning and found that the crystals retain a record of at least 150,000 years of magma storage and evolution. The dominant subvolcanic magma was relatively homogeneous and thermally stagnant for ∼110,000 years. In the 35,000 years before eruption, the diversity of melts increased substantially as the system grew… 

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References

SHOWING 1-10 OF 28 REFERENCES

Volcanism and the dynamics of open magma chambers

The repeated eruption of many volcanoes is now accounted for by events taking place in a subterranean magma chamber, which is ‘open’ in the sense that the inflow of material to the chamber from below

Recharge in Volcanic Systems: Evidence from Isotope Profiles of Phenocrysts

In samples from three magma systems from convergent margin volcanoes, sudden changes in major element composition, petrographic features, and strontium isotope composition were found to correspond to discrete magmatic events, most likely repeated recharge of more mafic magma with lower ratios of strontia-87 tostrontium-86 into a crustally contaminated magma.

On the Origin of Crystal-poor Rhyolites: Extracted from Batholithic Crystal Mushes

The largest accumulations of rhyolitic melt in the upper crust occur in voluminous silicic crystal mushes, which sometimes erupt as unzoned, crystal-rich ignimbrites, but are most frequently

Evolution of Bishop Tuff Rhyolitic Magma Based on Melt and Magnetite Inclusions and Zoned Phenocrysts

The evolution of large bodies of silicic magma is an important aspect BACKGROUND, SAMPLE SELECTION of planetary differentiation. Melt and mineral inclusions in phenocrysts AND METHODS and zoned

Compositional zonation and cumulus processes in the Mount Mazama magma chamber, Crater Lake, Oregon

ABSTRACT The 6845 ± 50 BP climactic eruption of Mount Mazama discharged 47 ± 9 km3 of vertically zoned calc-alkaline magma, affording a virtually complete section through the chamber. Evidence for

Petrogenesis of the Toba Tuffs, Sumatra, Indonesia

Earth (Smith & Bailey, 1968). It is elongated in a NW–SE During the past 1·2 my, at least 3400 km of magma have been direction parallel to the active volcanic front of Sumatra, erupted in four ash

Volcanic winter and accelerated glaciation following the Toba super-eruption

THE eruption of Toba in Sumatra 73,500 years ago was the largest known explosive volcanic event in the late Quaternary1. It could have lofted about 1015 g each of fine ash and sulphur gases to

Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified

Single-grain laser-fusion {sup 40}Ar/{sup 39}Ar analyses of individual sanidine phenocrysts from the two youngest Toba (Indonesia) tuffs yield mean ages of 73{plus minus}4 and 501{plus minus}5 ka. In

Mineral disequilibrium in lavas explained by convective self-mixing in open magma chambers

It is proposed that features of porphyritic andesite and dacite lavas that are rich in crystals and display a range of disequilibrium features can also be caused by convection within a magma body with a single composition, that is heated from below and cooled from above.

Formation of low-δ18O rhyolites after caldera collapse at Yellowstone, Wyoming, USA

We present a new model for the genesis of low-δ18O rhyolites of the Yellowstone caldera based on analyses of zircons and individual quartz phenocrysts. Low-δ18O rhyolites were erupted soon after the