Abstract
Core samples taken from North Lake, a brackish lake located in south Louisiana, were used to compare radiochronological methods for soft sediments. The radionuclides137Cs and210Pb were used to determine the ages of the core segments. The similarities in the vertical profiles of native lead and the radiolead suggested that diagenesis must be considered before accurate dates can be obtained. Correcting for the effects of diagenesis led to improved correlations with the137Cs dates and sedimentation rates. Sedimentation rates based on the corrected210Pb dates were 0.234 g/cm2year compared to the value for137Cs of 0.210 g/cm2year.
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