CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Bell, K.; and Kettles, I.M.
Date : 2003.
Title : Lead-isotope ratio measurements on hummock and hollow peat from Detour Lake area, Ontario.
Publication : Geological Survey of Canada, Current Research
Issue : 2003-C3.
Page(s) : 12 p.
Abstract
Lead isotope ratios determined for peat from a hummock and hollow sequence in a peatland near Detour Lake in northeastern Ontario are variable (206Pb/207Pb of 1.14 to 1.27 in peat and 1.17 to 1.19 in till) and indicate input of Pb from different sources. Although the Pb-isotope ratios show a pattern of systematic decrease during the last 100 years (206Pb/207Pb from 1.21 to 1.14), there is not a corresponding pattern of systematic change in Pb abundances. The Pb-isotope data, along with the Pb and Sc abundance data, from the hummock samples are best explained by Pb inputs from anthropogenic activities. Highest Pb-isotope ratios (206Pb/207Pb of 1.269) are found in hollow peat formed during the xerothermic period, 6500 to 4000 BP, a time when warmer and drier conditions affected most environmental systems.
Bibliography of Canadian Geomorphology