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Correlation of the oldest Toba Tuff to sediments in the central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Correlation of the oldest Toba Tuff to sediments in the central Indian Ocean Basin
 
Creator Pattan, J.N.
ShyamPrasad, M.
Babu, E.V.S.S.K.
 
Subject Toba Tuff
Central Indian Ocean Basin
sediment cores
glass shards
 
Description We have identified an ash layer in association with Australasian microtektites of approx. 0.77Ma old in two sediment cores which are approx. 450 km apart in the central Indian Ocean Basin (CIOB). Morphology and chemical composition of glass shards and associated microtektites have been used to trace their provenance. In ODP site 758 from Ninetyeast Ridge, ash layer-D (13 cm thick, 0.73-0.75 Ma) and layer-E (5 cm thick, 0.77-0.78 Ma) were previously correlated to the oldest Toba Tuff (OTT) eruptions of the Toba caldera, Sumatra. In this investigation, we found tephra approx. 3100 km to the southwest of Toba caldera that is chemically identical to layer D of ODP site 758 and ash in the South China Sea correlated to the OTT. Layer E is not present in the CIOB or other ocean basins. The occurrence of tephra correlating to layer D suggests a widespread distribution of OTT tephra (approx. 3.6 × 10 sup(7) km sup(3)), an ash volume of at least approx. 1800 km3, a total OTT volume of 2300 km sup(3), and classification of the OTT eruption as a super-eruption
 
Date 2010-08-10T09:12:23Z
2010-08-10T09:12:23Z
2010
 
Type Journal Article
 
Identifier Journal of Earth System Science, vol.199(4); 531-539
http://drs.nio.org/drs/handle/2264/3699
 
Language en
 
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Publisher Indian Academy of Sciences