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Sup(210)Pb, sup(230)Th, and sup(10)Be 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 Sup(210)Pb, sup(230)Th, and sup(10)Be 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 sediments
lead isotopes
thorium isotopes
beryllium isotopes
sediments
degassing
hydrothermal alteration
mineral composition
hydrothermal solutions
ISW, Central Indian Ocean Basin
 
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 2008-05-14T10:20:44Z
2017-09-30T03:07:59Z
2008-05-14T10:20:44Z
2017-09-30T03:07:59Z
2008
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.35(9):L09603; 2008; doi:10.1029/2008GL033849, 6pp
0094-8276
http://drs.nio.org/drs/handle/2264/7588
 
Language en
 
Relation Geophys Res Lett
SCI
 
Publisher Wiley