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

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

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3509603n&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 9, CiteID L09603

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Geochemistry: Hydrothermal Systems (0450, 3017, 3616, 4832, 8135, 8424), Geochemistry: Intra-Plate Processes (3615, 8415), Geochemistry: Alteration And Weathering Processes (3617), Geochemistry: Marine Geochemistry (4835, 4845, 4850), Geochemistry: Sedimentary Geochemistry

Scientific paper

Isotopic (210Pb, 238U-230Th, 10Be), major and trace elements, and micromorphological and microchemical data, were used to identify recent (~100 yrs) hydrothermal alteration of a >200 kyr sedimentary record from the flank of a seamount in the Central Indian Basin located at the edge of the 75°30'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. We interpret a predominant influence of neutral chloride type hydrothermal fluids. This is the first report of recently occurring sediment alteration by shallow circulating sub-surface fluids along the Indian Ocean intra-plate seamount environment.

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