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      https://www.ias.ac.in/article/fulltext/jess/109/01/0153-0156

    • Keywords

       

      Stable isotopes; Younger Dryas; deglaciation; holocene; last glacial maximum (LGM)

    • Abstract

       

      Stable carbon and oxygen isotopic analyses of the planktonic foraminifera (Globigerinoides ruber) from a deep sea sediment core (GC-1) in the Andaman Sea show high glacial-to-Holocene δ18O amplitude of 2.1%o which is consistent with previously published records from this marginal basin and suggest increased salinity and/or decreased temperature in the glacial surface waters of this region. A pulse of18O enrichment during the last deglaciation can be attributed to a Younger Dryas cooling event and/or to a sudden decrease of fresh water influx from the Irrawady and Salween rivers into the Andaman Sea. High δ13C values observed during the isotopic stages 2 and 4 are probably due to the enhanced productivity during glacial times in the Andaman Sea.

    • Author Affiliations

       

      S M Ahmad1 D J Patil1 P S Rao2 B N Nath2 B R Rao2 G Rajagopalan3

      1. National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, India
      2. National Institute of Oceanography, Dona Paula, Goa - 403 004, India
      3. Birbal Sahni Institute of Palaeobotany, Lucknow - 226 007, India

    • Dates

       
      Published
      March 2000

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