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210 pb as a chronometer and tracer, Burrinjuck Reservoir, Australia
Author(s) -
Wasson R. J.,
Clark R. L.,
Nanninga P. M.,
Waters J.
Publication year - 1987
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3290120406
Subject(s) - tracer , loss on ignition , sediment , provenance , geology , sedimentation , environmental science , soil science , hydrology (agriculture) , geochemistry , environmental chemistry , geomorphology , chemistry , physics , geotechnical engineering , nuclear physics
Cores taken at Burrinjuck Reservoir in southeastern New South Wales have been dated using the first appearance of 137 Cs, charcoal/bushfire correlations, and annual grass pollen peaks. None of the main 210 Pb dating models reproduced the ‘known’ chronology. Correlation analysis shows no significant relationship between original 210 Pb (unsupp.) concentration and grain‐size, sedimentation rate or loss on ignition. Differences in sediment source may explain the variations in 210 Pb. A simple provenance model has been used to interpret the ratio of original 210 Pb (unsupp.)/ 226 Ra as a tracer of topsoils and subsoils. High ratios in the reservoir sediments probably indicate eroded topsoils and low ratios eroded subsoils.