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      https://www.ias.ac.in/article/fulltext/jess/114/05/0443-0452

    • Keywords

       

      Magnetic susceptibility; terrigenous flux; late Quaternary; Southern Ocean

    • Abstract

       

      Changes in the terrigenous sediment source and transport mechanisms during the late Quaternary have been investigated using four sediment cores within the Indian sector of Southern Ocean, using the magnetic susceptibility (MS) and sedimentological records. Sediments deposited during the Holocene and other interglacial periods were characterised by low MS, low sand content, reduced ice-rafted detritus (IRD) input and increased illite possibly transported via hydrographic advection from the south. The glacial intervals are characterised by high MS, high sand content, increased IRD input and reduced illite clays, derived from both local as well as Antarctic sources. Significant reduction in clay fraction and illite content during glacials suggests that the erosive and transporting capabilities of the deep and bottom waters could have reduced compared to the interglacial times. The changes in terrigenous influx to this region were significantly influenced by the rhythmic glacial-interglacial fluctuations in bottom circulation and the position of the Polar Front.

    • Author Affiliations

       

      M Thamban1 S S Naik1 R Mohan1 A Rajakumar1 N Basavaiah2 Witty D’Souza1 Sarita Kerkar1 M M Subramaniam1 M Sudhakar1 P C Pandey1

      1. National Centre for Antarctic and Ocean Research, Headland Sada, Goa - 403 804, India
      2. Indian Institute of Geomagnetism, Kalamboli, New Panvel (W), Navi Mumbai - 410 218, India
    • Dates

       
  • Journal of Earth System Science | News

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