32Si Dating of Marine Sediments from Bangladesh
Issue Date
2001-01-01Keywords
radioactive decaySi 32
silicon
Ganges River
Bangladesh
Bay of Bengal
Brahmaputra River
Ganges Brahmaputra Delta
marine sedimentation
Indian Oceanplanar bedding structuressedimentary structuresvarvescosmogenic elementssedimentationsedimentation ratesmarine sedimentsaccuracyHolocenecorrelationpaleoclimatologysedimentsAsiaCenozoicQuaternaryIndian Peninsuladatesisotopesradioactive isotopesabsolute age
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Morgenstern, U., Geyh, M. A., Kudrass, H. R., Ditchburn, R. G., & Graham, I. J. (2001). 32Si dating of marine sediments from Bangladesh. Radiocarbon, 43(2B), 909-916.Journal
RadiocarbonDescription
From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.Additional Links
http://radiocarbon.webhost.uits.arizona.edu/Abstract
Appropriate dating tools are essential for paleoenvironmental studies. Cosmogenic 32Si with a half-life of about 140 years is ideally suited to cover the dating range 30-1000 years. Here we have applied scintillation spectrometry for detection of natural 32Si to date marine shelf sediments. High detection efficiency, combined with stable background, allows for the detection of extremely low 32Si specific activities found in such sediments with counting rates below one count per hour. For a sediment core from the Ganges-Brahmaputra delta 32Si dating yields mean sedimentation rates of 0.7 +/0.2 cm/yr for 50 to several hundred years BP and 3.1 +/0.8 cm/yr for the past 50 years. The four-fold increase of the sedimentation rate over the past 50 years may reflect increased sediment loads in the rivers due to increasing human colonization within the rivers' drainage basins.Type
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