Fig. 3: Global and terrestrial climate changes across the Eocene–Oligocene transition (EOT). | Nature Communications

Fig. 3: Global and terrestrial climate changes across the Eocene–Oligocene transition (EOT).

From: Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition

Fig. 3

a Low-frequency magnetic susceptibility (χlf) for the Tashan section, Xining Basin16. b Mean grain size, c χlf, d saturation isothermal remanent magnetization (SIRM), e hard isothermal remanent magnetization (HIRM), f chemical index of alteration (CIA), and g K2O/Al2O3 records from Lanzhou Basin playa-palaeolake sediments. Age models for both the Lanzhou and Xining records were established first by magnetochronology and were then refined by matching 405-kyr and 100-kyr components in the χlf record with the computed record of Earth’s orbital eccentricity43. h δ18O record of fossil remains from central North America13. i Sea surface temperature (SST) from IODP U1404, North Atlantic Ocean, based on alkenone unsaturation index15. j Benthic foraminiferal δ18O from ODP Site 744, southern Indian Ocean52. k, l Benthic foraminiferal δ18O and δ13C from ODP Site 1218, tropical Pacific Ocean5. The two increasing δ18O and δ13C steps are designated as EOT-1 and Oi-1, respectively. m Atmospheric pCO2 reconstruction across the EOT from ODP Site 925/929 with coccolith δ13C, boron isotopes, and alkenones53,54,55,56.

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