Dating holocene sediments Random live horney chat
For cores with low unsupported 210Pb and a truncated chronology, a more robust and extended dating model has been achieved by comparisons with well dated cores, and combining radiometric dating with tephrochronology, spheroidal carbonaceous particles (SCPs), instrumental data and documentary records.The unsupported 210Pb profiles of the cores have low isotopic abundance with the majority calibrated to the 137Cs peak, giving precise dates for only half the core length.Maps of sediment distribution derived from correlation of seismic-reflection profiles indicate that this trend cannot be attributed exclusively to autogenic processes (e.g., progradation of depocenters).The observed variability in sediment accumulation rates is thus largely controlled by allogenic factors, including: (1) increased discharge of Santa Clara River as a result of increased magnitude and frequency of El Ni?? 2 ka to present, (2) an apparent change in routing of coarse-grained sediment within the staging area at ca.
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