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Influence of sedimentation on enrichment of manganese and growth of ferromanganese micronodules, Bengal Fan, India

DRS at CSIR-National Institute of Oceanography

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Title Influence of sedimentation on enrichment of manganese and growth of ferromanganese micronodules, Bengal Fan, India
 
Creator Chauhan, O.S.
Rao, Ch.M.
 
Subject sedimentation
ferromanganese nodules
compaction
organic carbon
dissolution
 
Description Based upon down core variations in O/Mn ratio in sediment and in micronodules, Mn content, organic carbon and abundance of micronodules in two box cores from high and low sedimentation regions of the Bay of Bengal, 0-20 and 0-40 cm levels were identified as "Mn oxidation zone" in the western and the eastern regions of the Bay. Despite similarity in bottom water O sub(2) and organic carbon contents of the region, a higher abundance of micronodules down to the deeper levels was observed in the area of low sedimentation. But, in the upper surfaces increased enrichment of Mn was observed in core 1 located in the area of higher sediment accumulation. Rapid recycling of Mn (faster burial-transfer to Mn reduction zone-Mn dissolution and its upward diffusion-re-precipitation) increasing upward flux of Mn(II) and associated higher consumption of O sub(2) limits the width of Mn oxidation zone and appears to be responsible for enhanced enrichment of Mn in the area of high sedimentation. The results of the present study also suggest that though the availability of Mn controls the formation of micronodules, their resident time in Mn oxic zone regulates their growth and influences their morphology
 
Date 2009-01-10T11:15:56Z
2009-01-10T11:15:56Z
1999
 
Type Journal Article
 
Identifier Marine Geology, Vol.161; 39-47p.
http://drs.nio.org/drs/handle/2264/1784
 
Language en
 
Rights Copyright [1999]. 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 Elsevier