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210Pb, 230Th, and 10Be in Central Indian Basin seamount sediments: Signatures of degassing and hydrothermal alteration of recent origin

DRS at CSIR-National Institute of Oceanography

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Title 210Pb, 230Th, and 10Be in Central Indian Basin seamount sediments: Signatures of degassing and hydrothermal alteration of recent origin
 
Creator Nath, B.N.
Borole, D.V.
Aldahan, A.
Patil, S.K.
Mascarenhas-Pereira, M.B.L.
Possnert, G.
Ericsson, T.
Ramaswamy, V.
Gupta, S.M.
 
Subject trace elements
Central Indian Basin
sedimentary organic carbon
radiolarian skeletons
 
Description Isotopic (sup(210)Pb, sup(238)U-sup(230)Th, sup(10)Be), major and trace elements, and micromorphological and microchemical data, were used to identify recent (approx. 100 yrs) hydrothermal alteration of a greater than 200 kyr sedimentary record from the flank of a seamount in the Central Indian Basin located at the edge of the 75 degrees 30 minutes E fracture zone. Alteration effects are also reflected in 1) the depleted sedimentary organic carbon, 2) dissolution features of radiolarian skeletons, 3) the presence of altered minerals such as smectite and zeolites, and 4) distinctly different magnetic properties in the altered sediments. A predominant influence of neutral chloride type hydrothermal fluids is interpreted. This is the first report of recently occurring sediment alteration by shallow circulating sub-surface fluids along the Indian Ocean intra-plate seamount environment.
 
Date 2008-05-26T12:09:32Z
2008-05-26T12:09:32Z
2008
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.35; L0960, doi:10.1029/2008GL033849
http://drs.nio.org/drs/handle/2264/1085
 
Language en
 
Rights Copyright AGU[2008]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher American Geophysical Union