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ReportsProbing the Accumulation History of the Voluminous Toba Magma
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
1 Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095–1567, USA.
* To whom correspondence should be addressed. E-mail: jvazquez{at}ess.ucla.edu
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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. 
Present address: Department of Geological Sciences, California State University, Northridge, CA 91330–8266, USA. 
Science. ISSN 0036-8075 (print), 1095-9203 (online)
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