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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Volcanic Glass, Allanite and Zircon as Characteristic Minerals of the Toba Rhyolite at Sumatra's East Coast
H. W. Van Der Marel
ABSTRACT
Zircon and acidic volcanic glass present in the Toba rhyolitic tuff on Sumatra's East Coast are characterized by a typical habit. Allanite, a mineral usually not occurring in acid volcanic material, is also present.
It is shown that allanite and zircon are concentrated in strongly weathered soils in such quantities that the total of the "heavy" minerals (specific gravity > 2.9) consist almost entirely of these two minerals.
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