Magnetization of Sediments and the Environment - Paleomagnetism of Sedimentary Rocks: Process and Interpretation - page 109

depths greater than the large loss in magnetic inten-
sity. Kruiver et al . (2001) have provided an important
method of modeling the fi rst derivative of the IRM
acquisition curves that is a standard way for identify-
ing the magnetic mineralogy of a sample based on

its different coercivity components. In the Lake Ely
samples, IRM acquisition modeling shows two
distinct coercivity components at low coercivities less
than 100 mT (Figs 8.10 and 8.11). These are very
similar to Egli's (2004) observation of two different

Fig. 8.10 IRM acquisition curves for Lake Ely sediment collected at different depths in the 2005 piston core. The top fi gure
shows the location, with respect to the decrease in intensity downcore, of the samples used for the IRM acquisition
experiments shown in the bottom fi gure.