Fig. 4: Spectral and filter analysis from the Guide Basin in the NE Tibet (this study), and comparison with other climatic records over the interval of 14–10 Ma.
From: Moisture variability in northeast Tibet following the middle Miocene Climate transition
A Calculated eccentricity curve with a 405-kyr filter85 (red curve, 0.0025 ± 0.0005 cycles/kyr). B Global δ18Obenthic data with a 100-kyr filter64 (red curve, 0.01 ± 0.003 cycles/kyr). C Mn/Fe ratios in the Guide Basin with a 100-kyr filter (red curve, 0.01 ± 0.003 cycles/kyr). D Hematite/goethite ratios from the ODP1148 in the South China Sea with a 100-kyr filter30 (red curve, 0.01 ± 0.003 cycles/kyr). E CaSO4 content from the Aktau section in the Ili Basin and the 100-kyr filter55 (red curve, 0.01 ± 0.003 cycles/kyr). F Smectite/(illite+chlorite) ratios in the Guide section with 405-kyr (pink curve, 0.0025 ± 0.0005 cycles/kyr) and 100-kyr (red curve, 0.01 ± 0.003 cycles/kyr) filters. G Global δ13Cbenthic data with a 405-kyr filter72 (pink curve, 0.0025 ± 0.0005 cycles/kyr). The grey bars indicate relatively low values of the theoretical 405-kyr eccentricity.
