Palaeogeographic reconstructions of the Eocene-Oligocene Tarim Basin (NW China): Sedimentary response to late Eocene sea retreat

Zhang, Jingyu; Xing, Fengcun; Krijgsman, Wout; Zhang, Cheng; Wei, Wei; Chen, Lin; Yang, Song; Liu, Xiaochen; Lu, Yongchao

doi:10.1016/j.palaeo.2021.110796

Cited by 10 publications

(1 citation statement)

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“…4), which suggests a single Asian dust source region for Site U1333. Moreover, palaeogeographic and tectonic reconstructions across the EOT suggest that the Paratethys Sea still existed and that the Tarim and Qaidam Basins supported continental-lacustrine sedimentation at that time, which suggest that the northern Tibetan plateau (NTP) dust source had not formed [46][47][48] . Thus, dust from Site U1333 was mainly derived from a single Asian interior source region, such as the Mongolian Gobi (MG) deserts.…”

Section: Resultsmentioning

confidence: 99%

Equatorial Pacific dust fertilization and source weathering influences on Eocene to Miocene global CO2 decline

Wang

Roberts

Rohling

et al. 2023

Commun Earth Environ

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Stimulation of the biological pump by iron-bearing dust in the eastern equatorial Pacific Ocean plays an important role in long-term carbon sequestration, yet past dust fertilization and its impact on CO2 perturbations over major climate transitions remain debated. Here, we integrate proxies of dust input, source-region weathering, and biological pump activity from late Eocene to early Miocene sediments of Integrated Ocean Discovery Program Hole U1333, which includes the Eocene-Oligocene Transition (~34 million years ago) when a major ice sheet was first established on Antarctica. We find that intensified chemical weathering in the large central Asian dust source region enhanced atmospheric CO2 removal at ~34 Ma. Superimposed dust fertilization and biological pump action amplified this CO2 removal before ~34 Ma, while weakening of this amplification process helped to moderate the CO2 decline after that time. The observed inter-linked, counteracting processes with different timescales illustrate the complexity of carbon cycle feedbacks associated with major climate changes.

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Section: Resultsmentioning

confidence: 99%