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Science 13 August 2004:
Vol. 305. no. 5686, pp. 991 - 994
DOI: 10.1126/science.1096994
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Reports

Probing the Accumulation History of the Voluminous Toba Magma

Jorge A. Vazquez1*{dagger} and Mary R. Reid1,2

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 in size before erupting 75,000 years ago.

1 Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095–1567, USA.
2 Department of Geology, Northern Arizona University, Flagstaff, AZ 86011, USA.



{dagger} Present address: Department of Geological Sciences, California State University, Northridge, CA 91330–8266, USA.

* To whom correspondence should be addressed. E-mail: jvazquez{at}ess.ucla.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Reviews in Mineralogy and Geochemistry 69, 479-544
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Mineral Textures and Zoning as Evidence for Open System Processes.
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Reviews in Mineralogy and Geochemistry 69, 595-622
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Deciphering Magma Chamber Dynamics from Styles of Compositional Zoning in Large Silicic Ash Flow Sheets.
O. Bachmann and G. W. Bergantz (2008)
Reviews in Mineralogy and Geochemistry 69, 651-674
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MINOR-ELEMENT SYSTEMATICS OF FLUORAPATITE AND ZIRCON INCLUSIONS IN ALLANITE-(Ce) OF FELSIC VOLCANIC ROCKS FROM THREE OROGENIC BELTS: IMPLICATIONS FOR THE ORIGIN OF THEIR HOST MAGMAS.
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Zircon crystallization and recycling in the magma chamber of the rhyolitic Kos Plateau Tuff (Aegean arc).
O. Bachmann, B.L.A. Charlier, and J.B. Lowenstern (2007)
Geology 35, 73-76
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Laacher See revisited: High-spatial-resolution zircon dating indicates rapid formation of a zoned magma chamber.
A. K. Schmitt (2006)
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