Journal of Earth System Science

, Volume 114, Issue 5, pp 443–452 | Cite as

Changes in the source and transport mechanism of terrigenous input to the Indian sector of Southern Ocean during the late Quaternary and its palaeoceanographic implications

  • M. Thamban
  • S. S. Naik
  • R. Mohan
  • A. Rajakumar
  • N. Basavaiah
  • Witty D’Souza
  • Sarita Kerkar
  • M. M. Subramaniam
  • M. Sudhakar
  • P. C. Pandey
Article
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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.

Keywords

Magnetic susceptibility terrigenous flux late Quaternary Southern Ocean 
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Copyright information

© Indian Academy of Sciences 2005

Authors and Affiliations

  • M. Thamban
    • 1
  • S. S. Naik
    • 1
  • R. Mohan
    • 1
  • A. Rajakumar
    • 1
  • N. Basavaiah
    • 2
  • Witty D’Souza
    • 1
  • Sarita Kerkar
    • 1
  • M. M. Subramaniam
    • 1
  • M. Sudhakar
    • 1
  • P. C. Pandey
    • 1
  1. 1.National Centre for Antarctic and Ocean ResearchGoaIndia
  2. 2.Indian Institute of GeomagnetismNavi MumbaiIndia

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