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Coexistence of pumice and manganese nodule fields-evidence for submarine silicic volcanism in the Central Indian Basin

DRS at CSIR-National Institute of Oceanography

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Title Coexistence of pumice and manganese nodule fields-evidence for submarine silicic volcanism in the Central Indian Basin
 
Creator Iyer, S.D.
Sudhakar, M.
 
Subject geochemistry
trace elements
pumice
ferromanganese oxides
ferromanganese nodules
texture
deep-sea mining
topographic features
submarine features
sea mounts
abyssal hills
ocean basins
submarine volcanoes
sediment distribution
silica
 
Description Pumice, of various shapes and sizes, uncoated or coatEd. by ferromanganese oxides, have been recovered from deeper parts of the Central Indian Basin (CIB). The pumice field covers an area of 600,000 km sup(2), approximately encompassing one-ninth of the basinal area. Such a large field we believe, has not been reported previously in the world oceans. Pumice occurs as the nucleus for manganese nodules, suggesting that the morphology of pumice decide the shape, size and surface texture of the nodules. First-generation mine-sites of manganese nodules, of high abundance and paramarginal ore grade, seem to be closely related to the pumice field. Circumstantial evidence, i.e. juxtaposed pumice and nodule fields in the vicinity of three major fracture zones (73 degrees E, 75 degrees 45'E and 79 degrees E) and a number of seamounts and abyssal hills within and around the fields, suggest a tectonic control on the distribution of pumice. Further, it is speculated that in situ submarine silicic volcanism in the basin was responsible for the huge deposition of pumice. We rule out the possibility of drift pumice from any known sources. Chemical analysis of pumice from the CIB supports such a contention
 
Date 2009-05-06T10:47:12Z
2009-05-06T10:47:12Z
1993
 
Type Journal Article
 
Identifier Deep-Sea Research, Vol.40; 1123-1129p.
http://drs.nio.org/drs/handle/2264/2860
 
Language en
 
Rights Copyright [1993]. 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 Pergamon