Sediment radioisotope dating across a stratigraphic discontinuity in a mining-impacted lake
Document Type
Article
Publication Date
1-1-2007
Abstract
Application of radioisotope sediment dating models to lakes subjected to large anthropogenic sediment inputs can be problematic. As a result of copper mining activities, Torch Lake received large volumes of sediment, the characteristics of which were dramatically different from those of the native sediment. Commonly used dating models (CIC-CSR, CRS) were applied to Torch Lake, but assumptions of these methods are violated, rendering sediment geochronologies inaccurate. A modification was made to the CRS model, utilizing a distinct horizon separating mining from post-mining sediment to differentiate between two focusing regimes. 210Pb inventories in post-mining sediment were adjusted to correspond to those in mining-era sediment, and a sediment geochronology was established and verified using independent markers in 137Cs accumulation profiles and core X-rays. © 2006 Elsevier Ltd. All rights reserved.
Publication Title
Journal of Environmental Radioactivity
Recommended Citation
McDonald, C.,
&
Urban, N.
(2007).
Sediment radioisotope dating across a stratigraphic discontinuity in a mining-impacted lake.
Journal of Environmental Radioactivity,
92(2), 80-95.
http://doi.org/10.1016/j.jenvrad.2006.09.009
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/6683