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New occurrence of Youngest Toba Tuff in abyssal sediments of the Central Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title New occurrence of Youngest Toba Tuff in abyssal sediments of the Central Indian Ocean
 
Creator Pattan, J.N.
Shane, P.
Banakar, V.K.
 
Subject volcanic glass
pumice
siliceous sediments
abyssal zone
volcanism
volcanism
volcanic eruptions
volcanic ash
dust clouds
dust clouds
environmental impact
 
Description Volcanic glass and pumice found in siliceous abyssal sediments of the Central Indian Basin, south of the Equator, have previously been assigned various origins including intra-basin volcanism, Indonesian arc, and Krakatau. Rhyolitic glass shards dispersed from 8 cores that have examined are compositionally identical to those of fallout deposits of the Youngest Toba Tuff erupted at 74 ka from northern Sumatra. The correlation extends the distribution of coarse (> 63 mu m) glass shards some 1500 km south of the previously known fallout zone, and into the Southern Hemisphere (reaching latitudes of ca. 14 degrees S). This provides evidence for bi-hemispheric dispersal of the ash colud and supports global dispersal of gas and aerosods from the eruption. Such dispersal could have facilitated the global impact of the eruption
 
Date 2009-01-10T11:10:00Z
2009-01-10T11:10:00Z
1999
 
Type Journal Article
 
Identifier Marine Geology, Vol.155; 243-248p.
http://drs.nio.org/drs/handle/2264/1779
 
Language en
 
Rights Copyright [1999]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier