Distinction between the Youngest Toba Tuff and Oldest Toba Tuff from northern Sumatra based on the area density of spontaneous fission tracks in their glass shards |
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| Authors: | John A Westgate Nicholas JG Pearce Emma Gatti Hema Achyuthan |
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| Institution: | 1. Department of Earth Sciences, University of Toronto, Toronto M5S 3B1, Ontario, Canada;2. Department of Geography and Earth Science, Aberystwyth University, Wales SY23 3DB. UK;3. NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91106, USA;4. Department of Geology, Anna University, Chennai, India |
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| Abstract: | Determination of the area density of spontaneous fission tracks (ρs) in glass shards of Toba tephra is a reliable way to distinguish between the Youngest Toba Tuff (YTT) and the Oldest Toba Tuff (OTT). The ρs values for YTT, uncorrected for partial track fading, range from 70 to 181 tracks/cm2 with a weighted mean of 108 ± 5 tracks/cm2, based on 15 samples. Corrected ρs values for YTT are in the range of 77–140 tracks/cm2 with a weighted mean of 113 ± 8 tracks/cm2, within the range of uncorrected ρs values. No significant difference in ρs exists between YTT samples collected from marine and continental depositional settings. The uncorrected ρs for OTT is 1567 ± 114 tracks/cm2 so that confusion with YTT is unlikely. |
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| Keywords: | Volcanic glass shards Spontaneous fission tracks Partial track fading Toba tuffs Acheulean artifacts Sumatra India |
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