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

Abstract : The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene-Oligocene transition (EOT): the EOT-1 cooling event at ~34.1-33.9 Ma and the Oi-1 glaciation event at ~33.8-33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic and geochemical climate records from the northeastern Tibetan Plateau margin that are dated precisely from ~35.5 to 31 Ma by combined magneto- and astro-chronology. These records suggest a hydroclimate transition at ~33.7 Ma from eccentricity dominated cycles to oscillations paced by a combination of eccentricity, obliquity, and precession, and confirm that major Asian aridification and cooling occurred at Oi-1. We conclude that this terrestrial orbital response transition coincided with a similar transition in the marine benthic δO record for global ice volume and deep-sea temperature variations. The dramatic reorganization of the Asian climate system coincident with Oi-1 was, thus, a response to coeval atmospheric CO decline and continental-scale Antarctic glaciation.
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Hong Ao, Guillaume Dupont-Nivet, Eelco Rohling, Peng Zhang, Jean-Baptiste Ladant, et al.. Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition. Nature Communications, Nature Publishing Group, 2020, 11 (1), pp.5249. ⟨10.1038/s41467-020-18824-8⟩. ⟨insu-03006953⟩

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