## 4 Results
### Concentration Analysis  
Low field, bulk magnetic susceptibility is a measure of the concentration of magnetic minerals in the sediments. Low values of K are generally indicative of paramagnetic, antiferromagnetic (hematite), and diamagnetic minerals. Bulk susceptibility (Figure 6a) shows the lowest values in units TD7 and in the upper part of TD9. On the contrary, we see a large ferrimagnetic contribution in the top of TD8.9 and in the subunits of TD10. The  
Figure 5: Magnetic hysteresis loops of representative specimens from different stratigraphic depths, measured with the Magnetometer MicroMag VSM up to a maximum applied field of 500 mT and mass normalized. Curves are corrected for paramagnetic contribution. (**a**) sample TD10.3-511. (**b**) sample TD9–569. (**c**) sample TD8.9–483. (**d**) sample TD8–522. (**e**) sample TD7–71. (**f**) sample TD6–97. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Component 1**} & \multicolumn{3}{c}{**Component 2**} & \multicolumn{3}{c}{**Component 3**} \\
**Sample** & **SIRM** & **B\({}_{12}\)** & **DP** & **IRM** & **SIRM** & **B\({}_{12}\)** & **DP** & **IRM** & **SIRM** & **B\({}_{12}\)** & **DP** \\  & **(mA/m)** & **(mT)** & **(mT)** & **(\%)** & **(mA/m)** & **(mT)** & **(mT)** & **(\%)** & **(mA/m)** & **(mT)** & **(mT)** \\ \hline
10.3-546 & \(1.3\times 10^{-3}\) & 338.84 & 1.8 & 65 & \(7.1\times 10^{-4}\) & 1258.93 & 1.8 & 35 & & & \\
10.3-511 & \(7.8\times 10^{-4}\) & 218.78 & 2.0 & 55 & \(6.5\times 10^{-4}\) & 1258.93 & 2.0 & 45 & & \\
10.2-477 & \(8.4\times 10^{-4}\) & 316.23 & 2.0 & 53 & \(7.6\times 10^{-4}\) & 794.33 & 2.0 & 48 & & \\
9-586 & \(7.7\times 10^{-1}\) & 794.33 & 2.1 & 82 & \(1.7\times 10^{-1}\) & 3162.28 & 1.3 & 18 & & \\
9-569 & \(1\times 10^{-3}\) & 281.84 & 2.1 & 61 & \(6.5\times 10^{-4}\) & 1122.02 & 2.0 & 39 & & \\
8.9-492 & \(5.5\times 10^{-4}\) & 251.19 & 1.8 & 55 & \(3.7\times 10^{-4}\) & 1412.54 & 1.7 & 37 & \(8.5\times 10^{-5}\) & 1584.9 & 1.9 \\
8.9-483 & \(5.3\times 10^{-4}\) & 165.96 & 1.9 & 37 & \(5\times 10^{-4}\) & 416.87 & 1.9 & 35 & \(3.9\times 10^{-4}\) & 794.33 & 2.0 \\
8-522 & \(5.2\times 10^{-4}\) & 338.84 & 1.9 & 53 & \(4.7\times 10^{-4}\) & 1412.54 & 1.9 & 47 & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Input parameters (SIRM, B\({}_{1/2}\) and DP) of the components individuated for each unit in the Kruiver approach. phase angle parameter of lower frequency (Figure 6b) presents a slight, yet progressive, increase upward in the profile, only interrupted by minimum values in TD7 and in the middle TD9 units. Finally, the frequency-dependent parameter (Figure 6c) is quite constant with depth but sharply decreases in unit TD9 and lightly in TD7. A possible climatic influence of these changes will be later discussed. The intensity of the magnetization is given by (a) the saturation magnetization, (b) the anhysteretic remanence (ARM), and (c) isothermal remanence (IRM) (Figure 7). These parameters evidence the great abundance of low coercivity phase, likely magnetite, in TD10 and in the upper part of the TD8.9 unit. A pronounced maximum of ferrimagnetic material is observed in the boundary between TD10.3 and TD10.2, while the upper subunit presents a slight content decrease. The lower values of magnetization are observed in TD7 and in the middle part of TD9, in particular as revealed by the ARM. The overall pattern confirms again different rockmagnetic features of these units, which will be discussed later. Figure 6: Magnetic susceptibility parameters, all dimensionless (in SI units), subdivided by units (from TD6 to TD10.1, base to top respectively): (**a**) Bulk susceptibility; (**b**) Phase angle parameter; (**c**) Normalized frequency-dependence parameter. Simplified stratigraphic log to the left. Mineralogy composition and grain size can also be evaluated by some additional ratios (Figure 8).