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

作者：Westgate John A^*; Pearce Nicholas J G; Gatti Emma; Achyuthan Hema

来源：Quaternary Research, 2014, 82(2): 388-393.

DOI：10.1016/j.yqres.2014.07.001

• Volcanic glass shards
• Spontaneous fission tracks
• Partial track fading
• Toba tuffs
• Acheulean artifacts
• Sumatra
• India

Determination of the area density of spontaneous fission tracks (rho(s)) 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 rho(s) values for YTT, uncorrected for partial track fading, range from 70 to 181 tracks/cm(2) with a weighted mean of 108 5 tracks/cm(2), based on 15 samples. Corrected rho(s) values for YTT are in the range of 77-140 tracks/cm(2) with a weighted mean of 113 +/- 8 tracks/cm(2), within the range of uncorrected rho(s) values. No significant difference in rho(s) exists between YTT samples collected from marine and continental depositional settings. The uncorrected rho(s) for OTT is 1567 +/- 114 tracks/cm(2) so that confusion with YTT is unlikely. %26lt;br%26gt;The rho(s) values of the Toba tephra at Bori, Morgaon, and Gandhigram in northwestern India indicate a YTT identity, in agreement with geochemical data on their glass shards, the presence of multiple glass populations, and a glass fission-track age determination. Therefore, the view of others that OTT is present at these sites - and thereby indicates an early Pleistocene age for the associated Acheulean artifacts - is incorrect.

• 出版日期2014-9