Geochemical Fingerprinting - Application of Geochemical Tracers to Fluvial Sediment - page 37

Rowan et al. ( 2012 ), for example, applied the geochemical fingerprinting approach
to cores extracted from a lake—Llyn Tegid located in the headwaters of the River
Dee, Wales—to assess the potential cause(s) of recent cyanobacteria blooms. They
found by dating the cores (using 210 Pb and 137 Cs methods) that the sedimentation
rates within the lake were generally constant during the first half of the 20th century
(Fig. 2.9 ). However, sediment accumulation rates began to progressively increase
Fig. 2.9 a Variations in sediment source contributions through time as determined from the incre-
mental sampling and analysis of a core from Llyn Tegid, a lake in the Snowdonia National Park,
Wa l es . b Downcore trends in total phosphorus and Zn (modified from Rowan et al. 2012 )