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A note on chemical composition and origin of ferromanganese oxide coated and uncoated pumice samples from central Indian Ocean basin

DRS at CSIR-National Institute of Oceanography

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Title A note on chemical composition and origin of ferromanganese oxide coated and uncoated pumice samples from central Indian Ocean basin
 
Creator Pattan, J.N.
Parthiban, G.
Moraes, C.
Rajalakshmi, R.
Lekshmi, S.
Athira, S.
JaiSankar, S.
 
Subject CHEMISTRY AND BIOGEOCHEMISTRY
GEOLOGY AND GEOPHYSICS
GEOLOGY AND GEOPHYSICS
GEOLOGY AND GEOPHYSICS
 
Description Pumice are explosive volcanic product, occur as uncoated or coated with ferromanganese (Fe-Mn) oxide and resides in association with ferromanganese nodules on the seabed in Central Indian Ocean Basin (CIOB). The older Fe-Mn oxide coated and younger uncoated pumice clasts were leached with 6N HCl to remove Fe-Mn oxide coatings as well as the calcium carbonate present within the vesicles. The main objective of the present study is to understand the origin of these pumice by utilizing their chemical composition. Both coated and uncoated pumice samples are rhyoliteand medium K calc-alkaline series. Major, trace, rare earth elements (SigmaREE) concentration and chondrite-normalized REE patterns of both coated and uncoated pumice are nearly similar to each other suggesting a same source. Tectonomagmatic discrimination diagrams (Nb vs Y: Yb vs. Ta), triangular plot (TiO2-Y) and High Field Strength Element ratios (La/Ta-25; Ta/Hf-0.2; Nb/Ta-9; Zr/Nb-22 and Ba/Ta-1084) indicate volcanic arc origin. These were probably sourced from the nearest Indonesian volcanic arc and drifted to the CIOB by currents.
 
Date 2016-02-04T04:47:53Z
2016-02-04T04:47:53Z
2016
 
Type Journal Article
 
Identifier Journal Geological Society, vol.87(1); 2016; 62-68
http://drs.nio.org/drs/handle/2264/4903
 
Language en
 
Rights Copyright [2015]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository
 
Publisher Geological Society of India