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An occurrence of approx. 74 ka Youngest Toba tephra from the western continental margin of India

DRS at CSIR-National Institute of Oceanography

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Title An occurrence of approx. 74 ka Youngest Toba tephra from the western continental margin of India
 
Creator Pattan, J.N.
Shane, P.
Pearce, N.J.G.
Banakar, V.K.
Parthiban, G.
 
Subject marine sediments
Indian Ocean
 
Description A dispersed volcanic ash layer was recovered at ~6 300 cm depth in a 5.52 m long sediment core collected at a latitude 9~'21'E from a water depth of 2300 m on the Western Continental Margin of India (WCMI). Glass shards from ash layer were studied for morphology, major, trace and rare earth element concentration to trace the source. Bubble wall junction-type morphology of glass shard suggests magmatic origin. Shards have high SiO2 (77%) and total alkalies (8.5%), indicating rhyolitic composition. The major, trace and rare earth element composition of these glass shards are indistinguishable from that of Youngest Toba ash of ~6 74 ka from the Northern Sumatra and confirm as the source. The new occurrence of Youngest Toba Tuff from the WCMI, Central Indian Ocean Basin and South China Sea Basin suggests a reassessment of the ash volume and global climatic implications.
 
Date 2006-08-26T15:15:27Z
2006-08-26T15:15:27Z
2001
 
Type Journal Article
 
Identifier Current Science, vol. 80(10), 1322-1326pp.
http://drs.nio.org/drs/handle/2264/267
 
Language en
 
Format 173056 bytes
application/pdf
 
Publisher Indian Academy of Sciences