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Drift pumice in the central Indian Ocean Basin: Geochemical evidence

DRS at CSIR-National Institute of Oceanography

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Title Drift pumice in the central Indian Ocean Basin: Geochemical evidence
 
Creator Pattan, J.N.
Mudholkar, A.V.
JaiSankar, S.
Ilangovan, D.
 
Subject Pumice
Central Indian Ocean Basin
Indian Ocean
Drift origin
Youngest Toba Tuff
sediments
Krakatau
are-earth elements
 
Description Abundant white to light grey-coloured pumice without ferromanganese oxide coating occurs within the Quaternary sediments of the Central Indian Ocean Basin (CIOB). Two distinct groups of pumice are identified from their geochemical composition, which allow one to define two different origins linked to two separate eruptions. One group of pumice is a dacitic type characterized by high Fe, Ti, Mg, Al and Ca with comparatively low contents of Si, rare-earth elements (Sigma PREE, 69 ppm), Rb, Sr, U, Th, Ba, V, Nb, Sc, Mo and Co, which strongly suggest an origin from the 1883 Krakatau eruption. The other group is rhyolitic and is characterized by low contents of Fe, Ti, Mg and Ca and high Si, Sigma PREE content (121 ppm), Rb, Sr, U, Th, Ba, V, Nb, Mo, Co, and Sc and correlates well with the composition of the Youngest Toba Tuff (YTT) eruption of approx. 74 ka from Northern Sumatra and is being reported for the first time. Therefore, correlation of the pumice to the 1883 Krakatau and YTT eruptions indicates that the pumice drifted to the CIOB and eventually sank when it became waterlogged. However, physical properties such as density, specific gravity, porosity and degree of saturation required for sinking of pumice for both 1883 Krakatau and YTT are almost similar.
 
Date 2008-02-22T05:31:27Z
2008-02-22T05:31:27Z
2008
 
Type Journal Article
 
Identifier Deep-Sea Research I, Vol.55(3); 369-378p.
http://drs.nio.org/drs/handle/2264/964
 
Language en
 
Rights Copyright [2008]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Elsevier