Cargando…

Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene

The modern pattern of the Asian monsoon is thought to have formed around the Oligocene/Miocene transition and is generally attributed to Himalaya–Tibetan Plateau (H–TP) uplift. However, the timing of the ancient Asian monsoon over the TP and its response to astronomical forcing and TP uplift remains...

Descripción completa

Detalles Bibliográficos
Autores principales: Jin, Chun-Sheng, Xu, Deke, Li, Mingsong, Hu, Pengxiang, Jiang, Zhaoxia, Liu, Jianxing, Miao, Yunfa, Wu, Fuli, Liang, Wentian, Zhang, Qiang, Su, Bai, Liu, Qingsong, Zhang, Ran, Sun, Jimin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10104490/
https://www.ncbi.nlm.nih.gov/pubmed/37011203
http://dx.doi.org/10.1073/pnas.2214558120
_version_ 1785026048686030848
author Jin, Chun-Sheng
Xu, Deke
Li, Mingsong
Hu, Pengxiang
Jiang, Zhaoxia
Liu, Jianxing
Miao, Yunfa
Wu, Fuli
Liang, Wentian
Zhang, Qiang
Su, Bai
Liu, Qingsong
Zhang, Ran
Sun, Jimin
author_facet Jin, Chun-Sheng
Xu, Deke
Li, Mingsong
Hu, Pengxiang
Jiang, Zhaoxia
Liu, Jianxing
Miao, Yunfa
Wu, Fuli
Liang, Wentian
Zhang, Qiang
Su, Bai
Liu, Qingsong
Zhang, Ran
Sun, Jimin
author_sort Jin, Chun-Sheng
collection PubMed
description The modern pattern of the Asian monsoon is thought to have formed around the Oligocene/Miocene transition and is generally attributed to Himalaya–Tibetan Plateau (H–TP) uplift. However, the timing of the ancient Asian monsoon over the TP and its response to astronomical forcing and TP uplift remains poorly known because of the paucity of well-dated high-resolution geological records from the TP interior. Here, we present a precession-scale cyclostratigraphic sedimentary section of 27.32 to 23.24 million years ago (Ma) during the late Oligocene epoch from the Nima Basin to show that the South Asian monsoon (SAM) had already advanced to the central TP (32°N) at least by 27.3 Ma, which is indicated by cyclic arid–humid fluctuations based on environmental magnetism proxies. A shift of lithology and astronomically orbital periods and amplified amplitude of proxy measurements as well as a hydroclimate transition around 25.8 Ma suggest that the SAM intensified at ~25.8 Ma and that the TP reached a paleoelevation threshold for enhancing the coupling between the uplifted plateau and the SAM. Orbital short eccentricity-paced precipitation variability is argued to be mainly driven by orbital eccentricity-modulated low-latitude summer insolation rather than glacial-interglacial Antarctic ice sheet fluctuations. The monsoon data from the TP interior provide key evidence to link the greatly enhanced tropical SAM at 25.8 Ma with TP uplift rather than global climate change and suggest that SAM’s northward expansion to the boreal subtropics was dominated by a combination of tectonic and astronomical forcing at multiple timescales in the late Oligocene epoch.
format Online
Article
Text
id pubmed-10104490
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher National Academy of Sciences
record_format MEDLINE/PubMed
spelling pubmed-101044902023-10-03 Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene Jin, Chun-Sheng Xu, Deke Li, Mingsong Hu, Pengxiang Jiang, Zhaoxia Liu, Jianxing Miao, Yunfa Wu, Fuli Liang, Wentian Zhang, Qiang Su, Bai Liu, Qingsong Zhang, Ran Sun, Jimin Proc Natl Acad Sci U S A Physical Sciences The modern pattern of the Asian monsoon is thought to have formed around the Oligocene/Miocene transition and is generally attributed to Himalaya–Tibetan Plateau (H–TP) uplift. However, the timing of the ancient Asian monsoon over the TP and its response to astronomical forcing and TP uplift remains poorly known because of the paucity of well-dated high-resolution geological records from the TP interior. Here, we present a precession-scale cyclostratigraphic sedimentary section of 27.32 to 23.24 million years ago (Ma) during the late Oligocene epoch from the Nima Basin to show that the South Asian monsoon (SAM) had already advanced to the central TP (32°N) at least by 27.3 Ma, which is indicated by cyclic arid–humid fluctuations based on environmental magnetism proxies. A shift of lithology and astronomically orbital periods and amplified amplitude of proxy measurements as well as a hydroclimate transition around 25.8 Ma suggest that the SAM intensified at ~25.8 Ma and that the TP reached a paleoelevation threshold for enhancing the coupling between the uplifted plateau and the SAM. Orbital short eccentricity-paced precipitation variability is argued to be mainly driven by orbital eccentricity-modulated low-latitude summer insolation rather than glacial-interglacial Antarctic ice sheet fluctuations. The monsoon data from the TP interior provide key evidence to link the greatly enhanced tropical SAM at 25.8 Ma with TP uplift rather than global climate change and suggest that SAM’s northward expansion to the boreal subtropics was dominated by a combination of tectonic and astronomical forcing at multiple timescales in the late Oligocene epoch. National Academy of Sciences 2023-04-03 2023-04-11 /pmc/articles/PMC10104490/ /pubmed/37011203 http://dx.doi.org/10.1073/pnas.2214558120 Text en Copyright © 2023 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) .
spellingShingle Physical Sciences
Jin, Chun-Sheng
Xu, Deke
Li, Mingsong
Hu, Pengxiang
Jiang, Zhaoxia
Liu, Jianxing
Miao, Yunfa
Wu, Fuli
Liang, Wentian
Zhang, Qiang
Su, Bai
Liu, Qingsong
Zhang, Ran
Sun, Jimin
Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
title Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
title_full Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
title_fullStr Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
title_full_unstemmed Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
title_short Tectonic and orbital forcing of the South Asian monsoon in central Tibet during the late Oligocene
title_sort tectonic and orbital forcing of the south asian monsoon in central tibet during the late oligocene
topic Physical Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10104490/
https://www.ncbi.nlm.nih.gov/pubmed/37011203
http://dx.doi.org/10.1073/pnas.2214558120
work_keys_str_mv AT jinchunsheng tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT xudeke tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT limingsong tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT hupengxiang tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT jiangzhaoxia tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT liujianxing tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT miaoyunfa tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT wufuli tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT liangwentian tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT zhangqiang tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT subai tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT liuqingsong tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT zhangran tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene
AT sunjimin tectonicandorbitalforcingofthesouthasianmonsoonincentraltibetduringthelateoligocene