An occurrence of approx. 74 ka Youngest Toba tephra from the western continental margin of India
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Date
2001Author
Pattan, J.N.
Shane, P.
Pearce, N.J.G.
Banakar, V.K.
Parthiban, G.
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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.
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