Individual glass shard trace element analyses confirm that all known Toba tephra reported from India is from the c. 75-ka Youngest Toba eruption
IR@NIO: CSIR-National Institute Of Oceanography, Goa
View Archive Info| Field | Value | |
| Creator |
Pearce, N.J.G.
Westgate, J.A. Gatti, E. Pattan, J.N. Parthiban, G. Achyuthan, H. |
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| Date |
2014-12-11T06:41:29Z
2014-12-11T06:41:29Z 2014 |
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| Identifier |
Journal of Quaternary Science, vol.29(8); 2014; 729-734
http://drs.nio.org/drs/handle/2264/4665 |
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| Description |
Uncertainty over the identity and age of Toba tephras across peninsular India persists, with radiometric age dates contradicting earlier compositional data, which have been used to identify this important stratigraphic marker as the Youngest Toba Tuff (YTT). To address this issue, new single glass shard analyses have been performed for samples from Morgaon and Bori (north-western India), which have recently been dated at c. 800 ka. These, and indeed all Toba tephra samples thus far analysed from India, show the presence of four populations of glass shards (defined by their Ba/Y ratio), which uniquely identifies them as products of the c. 75-ka Youngest Toba eruption. Confirmation that the YTT fingerprint is characteristic comes from new analyses of Oldest Toba Tuff (OTT) glass shards from five sites in the Indian Ocean. These are compositionally identical to Layer D from the ODP site 758 sediment core (c. 800 ka), and belong to a single, low-Ba population, clearly different from YTT. These analyses show that there is essentially no reworked OTT material in the YTT eruption, and indicate unequivocally that all known Toba tephra occurrences in India belong to the c. 75-ka Youngest Toba eruption.
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| Language |
en
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| Publisher |
John Wiley
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| Rights |
This is a preprint of an article published in [Journal of Quaternary Science, vol.29(8); 2014; 729-734]”and an electronic link to the Journal’s WWW site, located at the following Wiley URL: http://onlinelibrary.wiley.com/doi/10.1002/jqs.2741/abstract
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| Subject |
glass shard
Toba Tuff trace element sediment |
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| Title |
Individual glass shard trace element analyses confirm that all known Toba tephra reported from India is from the c. 75-ka Youngest Toba eruption
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| Type |
Journal Article
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