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Alkali and alkaline earth metals in surface sediments off Bhimunipatnam—Amalapuram, central east coast of India (Bay of Bengal)

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Title Alkali and alkaline earth metals in surface sediments off Bhimunipatnam—Amalapuram, central east coast of India (Bay of Bengal)
 
Creator Sarma, Nittala S
Rao, M Umamaheswara
 
Description 375-379
The alkali
and alkaline earth metals both major (Na, K, Mg, Cal and minor (Li, Rb, Cs, Sr)
were analyzed in 75 surface sediment samples from an area covering the
continental shelf, slope and the deep sea regions. Lithium, Rb, Cs and Sr
averaged 7.2, 42.5, 12 and 27.2 ppm respectively. Rubidium and Sr showed
north-south trends. Starting from the northern sector, the former increased and
the latter decreased towards the mouth of R. Godavari. This behavior is
explained by the dissolved transportation index (DTI) according to which the transport
of Rb takes place mainly in the particulate and that of

Sr in the dissolved phases.
Lithium and Rb are correlated well to K suggesting a detrital origin for the
elements. The alkali and alkaline earth metal distribution of the study area
revealed a strong signature of R. Godavari. Strontium showed a good
anticorrelation with the biogenic fraction of Mg (MgB). It attained
peak concentrations in the carbonate sands of the northern outer shelf which
according to previous reports are of the late Pleistocene age. Sediments
although rich equally in carbonate and from proximate stations, contain
variable concentrations of Sr probably due to a differential time-dependent
leaching of the metal as these carbonate deposits may have been formed at
different stages of the regressive – progressive cycle of the late Quaternary
sea level.
 
Date 2014-01-15T09:47:16Z
2014-01-15T09:47:16Z
1999-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25715
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.28(4) [December 1999]