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Geochemistry of ferromanganese nodule-sediment pairs from central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Geochemistry of ferromanganese nodule-sediment pairs from central Indian Ocean Basin
 
Creator Pattan, J.N.
Parthiban, G.
 
Subject ferromanganese nodule
manganese micronodules
siliceous ooze
calcareous ooze
 
Description Fourteen ferromanganese nodule-sediment pairs from different sedimentary environments such as siliceous ooze (11), calcareous ooze (two) and red clay (one) from Central Indian Ocean Basin (CIOB) were analysed for major, trace and rare earth elements (REE) to understand the possible elemental relationship between them. Nodules from siliceous and calcareous ooze are diagenetic to early diagenetic whereas, nodule from red clay is of hydrogenetic origin. Si, Al and Ba are enriched in the sediments compared to associated nodules; K and Na are almost in the similar range in nodule–sediment pairs and Mn, Fe, Ti, Mg, P, Ni, Cu, Mo, Zn, Co, Pb, Sr, V, Y, Li and REEs are all enriched in nodules compared to associated sediments (siliceous and calcareous). Major portion of Si, Al and K in both nodules and sediments appear to be of terrigenous nature. The elements which are highly enriched in the nodules compared to associated sediments from both siliceous and calcareous ooze are Mo-(307, 273), Ni-(71, 125), Mn-(64, 87), Cu-(43, 80), Co-(23, 75), Pb-(15, 24), Zn-(9, 11) and V-(8, 19) respectively. These high enrichment ratios of elements could be due to effective diagenetic supply of metals from the underlying sediment to the nodule. Enrichment ratios of transition metals and REEs in the nodule to sediment are higher in CIOB compared to Pacific and Atlantic Ocean. Nodule from red clay, exhibit very small enrichment ratio of four with Mn and Ce while, Al, Fe, Ti, Ca, Na, K, Mg, P, Zn, Co, V, Y and REE are all enriched in red clay compared to associated nodule. This is probably due to presence of abundant smectite, fish teeth, micronodules and phillipsite in the red clay. The strong positive correlation (r > or = 0.8) of Mn with Ni, Cu, Zn and Mo and a convex pattern of shale-normalized REE pattern with positive Ce-anomaly of siliceous ooze could be due to presence of abundant manganese micronodules. None of the major trace and REE exhibits any type of inter-elemental relationship between nodule and sediment pairs. Therefore, it may not be appropriate to correlate elemental behaviour between these pairs
 
Date 2011-01-04T07:01:04Z
2011-01-04T07:01:04Z
2011
 
Type Journal Article
 
Identifier Journal of Asian Earth Sciences, vol.40(2); 2011; 569-580
no
http://drs.nio.org/drs/handle/2264/3767
 
Language en
 
Relation J_Asian_Earth_Sci_40_569.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
 
Publisher Elsevier