Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau
The Eocene-Oligocene transition (EOT, -33.9 Ma), a period of dramatic global cooling marking the onset of the Antarctic ice sheet. However, paleoclimatic reconstructions indicate a notable spatial heterogeneity in both the marine and terrestrial realms. While limited temporal resolution terrestrial...
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ftchacadscgigcas:oai:ir.gig.ac.cn:344008/77131 2024-09-30T14:27:10+00:00 Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau Tang, He Cui, Hao Li, Shu-Feng Spicer, Robert A. Li, Shi -Hu Su, Tao Zhou, Zhe-Kun Witkowski, Caitlyn R. Lauretano, Vittoria Wei, Gang-Jian 2024-03-01 http://ir.gig.ac.cn/handle/344008/77130 http://ir.gig.ac.cn/handle/344008/77131 https://doi.org/10.1016/j.gloplacha.2024.104388 英语 eng GLOBAL AND PLANETARY CHANGE http://ir.gig.ac.cn/handle/344008/77130 http://ir.gig.ac.cn/handle/344008/77131 doi:10.1016/j.gloplacha.2024.104388 Physical Geography Geology Antarctica glaciation Elemental geochemistry Chemical weathering Paleogene Orbital forcing 期刊论文 2024 ftchacadscgigcas https://doi.org/10.1016/j.gloplacha.2024.104388 2024-09-16T14:26:10Z The Eocene-Oligocene transition (EOT, -33.9 Ma), a period of dramatic global cooling marking the onset of the Antarctic ice sheet. However, paleoclimatic reconstructions indicate a notable spatial heterogeneity in both the marine and terrestrial realms. While limited temporal resolution terrestrial records have hindered the precise understanding of short-term climate events and orbital-scale changes during this transition. Here, we present a chemical weathering data sequence from a fluvial-lacustrine deposition from Luhe Basin, which is located at southeastern margin of the Tibetan Plateau. Based on the radioisotope, paleomagnetic and 405 kyr orbital tuning of the elemental datasets, the deposition age of Luhe Basin is dated to -35.5-25.5 Ma. Two weakening stages of the weathering intensity are detected around Eocene-Oligocene boundary: 34.1 to 33.9 Ma and 33.8 to 33.6 Ma, which are temporally equivalent to the two global main climatic steps of EOT (EOT-1 and Oi-1). We find the chemical weathering intensity sequence paced the 1.2 Myr obliquity amplitude modulation and 405 kyr longeccentricity cycles. Notably, the minima of 1.2 Myr obliquity amplitude and 405 kyr eccentricity are synchronous with the Oil-1 event. These patterns highlight the role of orbital forcing in shaping the cooling trend across the EOT and may trigger Antarctic glaciation. Report Antarc* Antarctic Antarctica Ice Sheet Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) Antarctic The Antarctic Global and Planetary Change 234 104388 |
institution |
Open Polar |
collection |
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscgigcas |
language |
English |
topic |
Physical Geography Geology Antarctica glaciation Elemental geochemistry Chemical weathering Paleogene Orbital forcing |
spellingShingle |
Physical Geography Geology Antarctica glaciation Elemental geochemistry Chemical weathering Paleogene Orbital forcing Tang, He Cui, Hao Li, Shu-Feng Spicer, Robert A. Li, Shi -Hu Su, Tao Zhou, Zhe-Kun Witkowski, Caitlyn R. Lauretano, Vittoria Wei, Gang-Jian Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau |
topic_facet |
Physical Geography Geology Antarctica glaciation Elemental geochemistry Chemical weathering Paleogene Orbital forcing |
description |
The Eocene-Oligocene transition (EOT, -33.9 Ma), a period of dramatic global cooling marking the onset of the Antarctic ice sheet. However, paleoclimatic reconstructions indicate a notable spatial heterogeneity in both the marine and terrestrial realms. While limited temporal resolution terrestrial records have hindered the precise understanding of short-term climate events and orbital-scale changes during this transition. Here, we present a chemical weathering data sequence from a fluvial-lacustrine deposition from Luhe Basin, which is located at southeastern margin of the Tibetan Plateau. Based on the radioisotope, paleomagnetic and 405 kyr orbital tuning of the elemental datasets, the deposition age of Luhe Basin is dated to -35.5-25.5 Ma. Two weakening stages of the weathering intensity are detected around Eocene-Oligocene boundary: 34.1 to 33.9 Ma and 33.8 to 33.6 Ma, which are temporally equivalent to the two global main climatic steps of EOT (EOT-1 and Oi-1). We find the chemical weathering intensity sequence paced the 1.2 Myr obliquity amplitude modulation and 405 kyr longeccentricity cycles. Notably, the minima of 1.2 Myr obliquity amplitude and 405 kyr eccentricity are synchronous with the Oil-1 event. These patterns highlight the role of orbital forcing in shaping the cooling trend across the EOT and may trigger Antarctic glaciation. |
format |
Report |
author |
Tang, He Cui, Hao Li, Shu-Feng Spicer, Robert A. Li, Shi -Hu Su, Tao Zhou, Zhe-Kun Witkowski, Caitlyn R. Lauretano, Vittoria Wei, Gang-Jian |
author_facet |
Tang, He Cui, Hao Li, Shu-Feng Spicer, Robert A. Li, Shi -Hu Su, Tao Zhou, Zhe-Kun Witkowski, Caitlyn R. Lauretano, Vittoria Wei, Gang-Jian |
author_sort |
Tang, He |
title |
Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau |
title_short |
Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau |
title_full |
Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau |
title_fullStr |
Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau |
title_full_unstemmed |
Orbital-paced silicate weathering intensity and climate evolution across the Eocene-Oligocene transition in the southeastern margin of the Tibetan Plateau |
title_sort |
orbital-paced silicate weathering intensity and climate evolution across the eocene-oligocene transition in the southeastern margin of the tibetan plateau |
publishDate |
2024 |
url |
http://ir.gig.ac.cn/handle/344008/77130 http://ir.gig.ac.cn/handle/344008/77131 https://doi.org/10.1016/j.gloplacha.2024.104388 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_relation |
GLOBAL AND PLANETARY CHANGE http://ir.gig.ac.cn/handle/344008/77130 http://ir.gig.ac.cn/handle/344008/77131 doi:10.1016/j.gloplacha.2024.104388 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2024.104388 |
container_title |
Global and Planetary Change |
container_volume |
234 |
container_start_page |
104388 |
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1811633317238276096 |