Dating Recent Sediments

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Dating recent sediments from the subaqueous Yangtze Delta . . .
Radiometric dating of recent sediments: On the performance . . .
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PDF Radiometric Dating of the Danube Delta Lakes Recent Sediments
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Multiple dating approaches applied to the recent sediments . . .
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Chronology is always one of the most important but difficult aspects of the reconstruction of sediment successions . Since the first application of 210 Pb geochronology for marine sediments (Koide et al ., 1972), the fallout radionuclides, mostly 210 Pb and 137 Cs, have been used widely for dating recent river mouth and shelf sediments . But there are obvious limitations on the use of these geochronological methods .
For recent sediments (<100-150 y) the most common dating technique uses fallout 210 Pb, a natural radionuclide . The method was first proposed for dating glacier ice ( Goldberg, 1963 ) and it was first applied to lacustrine sediments by Krishnaswamy et al . (1971) , and to marine sediments by Koide et al . (1972) .
DATING RECENT SEDIMENTS BY 210Pb: PROBLEMS AND SOLUTIONS P . G . Appleby Department of Mathematical Sciences, University of Liverpool Liverpool L69 3BX, UK 1 Introduction Accurate dating by 210Pb is of crucial importance to a wide range of programs studying environmental records stored in natural archives such as lake sedi-ments or peat bog accumulations .
deposited over the last few centuries, a suite of other dating methods were tested . Feist (2017) used the isotope 210Pb to date recent ( 100 years) sediments contaminated with heavy metals in Hidden River Cave, Kentucky . Very recent sedimentation (two to three months) in caves has been traced using 7Be (Broderick et al ., 2017) .
Some of these soil particles naturally labeled with 137 Cs then move through the sedimentation cycle and can be used to date sediment profiles . Two distinct periods of erosion and sedimentation (1959-1960 and 1963-1964) can be associated with periods of maximum atmospheric fallout . Data from other reservoirs illustrate the utility of this method .
The sediment core NKT (~ 90-cm length) represents a deposition history since 1692 AD assuming a constant sedimentation rate of 0 .25 cm year −1 beyond 26 cm . Select depths from bottom of the core would be used for other dating technique, as 210 Pb can only be used for the recent sediments deposited in last two centuries .
Absolute Dating of Recent Sediments in the Cyclone-influenced Shelf Area Off Bangladesh: Comparison of Gamma Spectrometric (137 Cs, 210 Pb, 228 Ra), Radiocarbon, and 32 Si Ages Published online by Cambridge University Press: 18 July 2016
Radiometric Dating of the Danube Delta Lakes Recent Sediments L . Dinescu*, O . G . Duliu**, E . Andries*, R .H . Dorcioman*, N . Dinescu***, M . Pascu* , C . Roncea* •National Institute of Research and Development for Physics and Nuclear Engineering - Horia Hulubei, P .O .Box MG - 6, RO - 76900, Bucharest, Romania, e-mail GRETA@ROIFA .IFA .RO
Recent sediments have been dated by fallout radionuclides ( Krishnaswamy et al . 1971) . Present methods of determining recent sedimentation rates involve the sur-vey and subscqucnt resurvey of rcscrvoirs (Task Committee 1970) . We describe a method for dating recent sediments and computing recent rates?f sedimentation using fallout ln7Cs . . .
Request PDF | Multiple dating approaches applied to the recent sediments in the Yangtze River (Changjiang) subaqueous delta | The accumulation rate of recent deposits in a delta environment is . . .
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Dating Recent Sediments

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