Figure 2
From: Oligocene moisture variations as evidenced by an aeolian dust sequence in Inner Mongolia, China
Palaeoenvironmental records during the latest Eocene to late Oligocene. (a) Magnetic records showing mass-normalized low-frequency magnetic susceptibility (χ), the absolute frequency dependency of magnetic susceptibility (χFD) and hard isothermal remanent magnetization (HIRM). (b) K-feldspar, plagioclase and quartz abundance. (c) Major elemental oxides (Al2O3, CaO, MgO, Na2O, K2O, SiO2, Fe2O3, TiO2, MnO, P2O5) and the soil organic carbon (SOC) content. (d) The compiled benthic foraminifer δ18O record2. The red line in (a, d) from 33.5 to 27 Ma is the fourth-order polynomial fit to show the trend. Four zones based on the proxies are marked on the figure.
