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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doi: 10.1016/j.yqres.2014.07.001
Author(s): Westgate, John A.; Pearce, Nicholas J. G.; Gatti, Emma; Achyuthan, Hema
Author Affiliation(s): Primary:
University of Toronto, Department of Earth Sciences, Toronto, ON, Canada
Other:
Aberystwyth University, United Kingdom
Jet Propulsion Laboratory, United States
Anna University, India
Volume Title: Quaternary Research
Source: Quaternary Research, 82(2), p.388-393. Publisher: Elsevier, New York, NY, United States. ISSN: 0033-5894 CODEN: QRESAV
Note: In English. 34 refs.; illus., incl. 2 tables, sketch map
Summary: Determination of the area density of spontaneous fission tracks ( 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 s 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 s 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 s values. No significant difference in s exists between YTT samples collected from marine and continental depositional settings. The uncorrected s for OTT is 1567 tracks/cm2 so that confusion with YTT is unlikely. The 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 a Lower Pleistocene age for the associated Acheulean artifacts - is incorrect. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 03 Geochronology; 24 Surficial Geology, Quaternary Geology; Acheulian; Archaeology; Artifacts; Asia; Cenozoic; Far East; Fission tracks; Fission-track dating; Geochronology; Glasses; Igneous rocks; India; Indian Ocean; Indian Peninsula; Indonesia; Leg 121; Malaysia; Ninetyeast Ridge; Northern Sumatra; ODP Site 758; Ocean Drilling Program; Paleolithic; Pleistocene; Pyroclastics; Quaternary; Stone Age; Sumatra; Toba Lake; Toba Tuff; Tuff; Upper Pleistocene; Volcanic glass; Volcanic rocks; Volcanism
Coordinates: N052302 N052303 E0902141 E0902140
Record ID: 2015068933
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands