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Origin of ash in the Central Indian Ocean Basin and its implication for the volume estimate of the 74,000 year BP Youngest Toba eruption

DRS at CSIR-National Institute of Oceanography

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Title Origin of ash in the Central Indian Ocean Basin and its implication for the volume estimate of the 74,000 year BP Youngest Toba eruption
 
Creator Pattan, J.N.
Pearce, N.J.G.
Banakar, V.K.
Parthiban, G.
 
Subject Indian Ocean Basin
Toba Tuff
 
Description A controversy exists about the origin of ash in the Central Indian Ocean Basin (CIOB). In situ silicic volcanism and Indonesian arc volcanism have been proposed as sources of ash in the basin. We present here the detailed morphology and chemical composition (ten major, 20 trace and 14 rare earth elements (REE)) of glass shards from eight sediment cores in the CIOB to gain insights and provide new estimates of ash volume. The glass shards are of rhyolitic composition with a strong negative Europium anomaly, and show a bubble wall junction-type morphology suggesting a magmatic type of eruption. Major, trace and REE composition and morphology of the shards suggest Youngest Toba Tuff (YTT) of ~ 74 ka of Northern Sumatra as the source for the ash. The YTT shards have higher Ca, K, Al, Cs, Ba, Ta, Th, U and heavy REE and lower Fe, Rb, Sr, Y and light REE compared to Middle Toba Tuff, and higher Si, K, Hf and light REE, and lower Ti, Fe, Mn, Mg, Ca, Na, Rb, Sr, Y, Nb, Th, U and heavy REE compared to Oldest Toba Tuff. The YTT covers a new minimum area of ~ 3.2 × 10
 
Date 2006-08-29T07:09:44Z
2006-08-29T07:09:44Z
2002
 
Type Journal Article
 
Identifier Current Science, vol.83(7), 889-893p.
http://drs.nio.org/drs/handle/2264/289
 
Language en
 
Format 302803 bytes
application/pdf
 
Publisher Indian Academy of Sciences