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

Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition
Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition
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 δ18O 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 CO2 decline and continental-scale Antarctic glaciation.
2041-1723
Ao, Hong
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Dupont-nivet, Guillaume
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Rohling, Eelco J.
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Zhang, Peng
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Ladant, Jean-baptiste
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Roberts, Andrew P.
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Licht, Alexis
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Liu, Qingsong
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Liu, Zhonghui
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Dekkers, Mark J.
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Coxall, Helen K.
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Jin, Zhangdong
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Huang, Chunju
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Xiao, Guoqiao
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Poulsen, Christopher J.
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Barbolini, Natasha
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Meijer, Niels
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Sun, Qiang
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Qiang, Xiaoke
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Yao, Jiao
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An, Zhisheng
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Ao, Hong
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Dupont-nivet, Guillaume
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Rohling, Eelco J.
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Zhang, Peng
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Ladant, Jean-baptiste
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Roberts, Andrew P.
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Licht, Alexis
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Liu, Qingsong
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Liu, Zhonghui
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Dekkers, Mark J.
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Coxall, Helen K.
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Jin, Zhangdong
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Huang, Chunju
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Xiao, Guoqiao
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Poulsen, Christopher J.
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Barbolini, Natasha
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Meijer, Niels
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Sun, Qiang
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Qiang, Xiaoke
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Yao, Jiao
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An, Zhisheng
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Ao, Hong, Dupont-nivet, Guillaume, Rohling, Eelco J., Zhang, Peng, Ladant, Jean-baptiste, Roberts, Andrew P., Licht, Alexis, Liu, Qingsong, Liu, Zhonghui, Dekkers, Mark J., Coxall, Helen K., Jin, Zhangdong, Huang, Chunju, Xiao, Guoqiao, Poulsen, Christopher J., Barbolini, Natasha, Meijer, Niels, Sun, Qiang, Qiang, Xiaoke, Yao, Jiao and An, Zhisheng (2020) Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition. Nature Communications, 11 (1), [5249]. (doi:10.1038/s41467-020-18824-8).

Record type: Article

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 δ18O 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 CO2 decline and continental-scale Antarctic glaciation.

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s41467-020-18824-8 - Version of Record
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Accepted/In Press date: 16 September 2020
Published date: 1 December 2020
Additional Information: Funding Information: This study was supported financially by the Chinese Academy of Sciences (CAS) Strategic Priority Research Program (XDB 40000000), the Second Tibetan Plateau Scientific Expedition and Research (STEP) program (2019QZKK0707, 2019QZKK0101), the CAS Key Research Program of Frontier Sciences (QYZDB-SSW-DQC021), the National Natural Science Foundation of China, the Ministry of Science and Technology of China, Australian Research Council (ARC) Australian Laureate Fellowship grant FL120100050 to E.J.R., ARC grant DP120103952 to A.P.R., ERC consolidator grant MAGIC 649081 to G.D.-N., N.B., N.M., and A.L., and the Bolin Center for Climate Research to H.C. Publisher Copyright: © 2020, The Author(s).

Identifiers

Local EPrints ID: 444771
URI: http://eprints.soton.ac.uk/id/eprint/444771
ISSN: 2041-1723
PURE UUID: 820f89a7-c49a-431a-8d20-5a197638cb01
ORCID for Eelco J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

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Date deposited: 04 Nov 2020 17:31
Last modified: 06 Jun 2024 01:34

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Contributors

Author: Hong Ao
Author: Guillaume Dupont-nivet
Author: Peng Zhang
Author: Jean-baptiste Ladant
Author: Andrew P. Roberts
Author: Alexis Licht
Author: Qingsong Liu
Author: Zhonghui Liu
Author: Mark J. Dekkers
Author: Helen K. Coxall
Author: Zhangdong Jin
Author: Chunju Huang
Author: Guoqiao Xiao
Author: Christopher J. Poulsen
Author: Natasha Barbolini
Author: Niels Meijer
Author: Qiang Sun
Author: Xiaoke Qiang
Author: Jiao Yao
Author: Zhisheng An

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