Absolute Dating of Recent Sediments in the Cyclone-Influenced Shelf Area off Bangladesh: Comparison of Gamma Spectrometric (137Cs, 210Pb, 228Ra), Radiocarbon, and 32Si Ages
Issue Date
2001-01-01Keywords
gamma ray spectrahurricanes
inner shelf
Ra 228
sediment transport
shelf environment
storm environment
continental shelf
Si 32
silicon
Bangladesh
Bay of Bengal
radium
lead
Pb 210
Indian Ocean
cesium
alkali metals
Cs 137
cores
marine environment
marine sediments
spectra
Holocene
alkaline earth metals
metals
sediments
Asia
Cenozoic
Quaternary
Indian Peninsula
C 14
carbon
dates
isotopes
radioactive isotopes
absolute age
Metadata
Show full item recordCitation
Suckow, A., Morgenstern, U., & Kudrass, H.-R. (2001). Absolute dating of recent sediments in the cyclone-influenced shelf area off Bangladesh: Comparison of gamma spectrometric (137Cs, 210Pb, 228Ra), radiocarbon, and 32Si ages. Radiocarbon, 43(2B), 917-927.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
A geochronological survey of the Bengal shelf area involved results from more than 20 sediment cores dated using gamma spectrometry and the nuclides 137Cs, 228Ra, 226Ra, and 210Pb. In some cores, which contained older sediments, 32Si and 14C were determined to examine the possibility to extrapolate the obtained chronologies to century and millennial scale. Geochronological work in this region is faced with problems of cyclone-induced sediment reworking, grain-size effects on fallout nuclides, scarcity of carbonates, unknown 14C reservoir effect and sedimentation rates that are too high to obtain sediment cores long enough to establish a chronology. Despite these problems, comparison between the results of the different dating methods provided the most reliable sediment balance to date for the submarine delta of the Ganges-Brahmaputra river system and indicated that on a time scale of several centuries at least 35% of the annual sediment load is deposited.Type
Proceedingstext
Language
enISSN
0033-8222ae974a485f413a2113503eed53cd6c53
10.1017/S0033822200041588