Sediment radioisotope dating across a stratigraphic discontinuity in a mining-impacted lake.
J Environ Radioact
; 92(2): 80-95, 2007.
Article
en En
| MEDLINE
| ID: mdl-17110003
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. (210)Pb 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 (137)Cs accumulation profiles and core X-rays.
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Banco de datos:
MEDLINE
Asunto principal:
Radioisótopos
/
Radiometría
/
Sedimentos Geológicos
/
Agua Dulce
/
Minería
Tipo de estudio:
Evaluation_studies
/
Prognostic_studies
Idioma:
En
Año:
2007
Tipo del documento:
Article