Aridification signatures from fossil pollen indicate a drying climate in east-central Tibet during the late Eocene

doi:10.5194/cp-16-2255-2020

ISL OpenIR > 盐湖地质与环境实验室

	Aridification signatures from fossil pollen indicate a drying climate in east-central Tibet during the late Eocene
	Yuan, Qin; Barbolini, Natasha; Rydin, Catarina; Gao, Dong-Lin; Wei, Hai-Cheng; Fan, Qi-Shun; Qin, Zhan-Jie; Du, Yong-Sheng; Shan, Jun-Jie; Shan, Fa-Shou; Vajda, Vivi
第一作者	Yuan, Qin
	2020-11-20
发表期刊	CLIMATE OF THE PAST
ISSN	1814-9324
卷号	16 期号:6 页码:2255-2273
摘要	Central Asia experienced a number of significant elevational and climatic changes during the Cenozoic, but much remains to be understood regarding the timing and driving mechanisms of these changes as well as their influence on ancient ecosystems. Here, we describe the palaeoecology and palaeoclimate of a new section from the Nangqian Basin in Tibet, north-western China, dated as Bartonian (41.2-37.8 Ma; late Eocene) based on our palynological analyses. Located on the east-central part of what is today the Tibetan Plateau, this section is excellently placed for better understanding the palaeoecological history of Tibet following the Indo-Asian collision. Our new palynological record reveals that a strongly seasonal steppe-desert ecosystem characterized by drought-tolerant shrubs, diverse ferns, and an underlying component of broad-leaved forests existed in east-central Tibet during the Eocene, influenced by a southern monsoon. A transient warming event, possibly the middle Eocene climatic optimum (MECO; 40 Ma), is reflected in our record by a temporary increase in regional tropical taxa and a concurrent decrease in steppe-desert vegetation. In the late Eocene, a drying signature in the palynological record is linked to proto-Paratethys Sea retreat, which caused widespread long-term aridification across the region. To better distinguish between local climatic variation and farther-reaching drivers of Central Asian palaeoclimate and elevation, we correlated key palynological sections across the Tibetan Plateau by means of established radioisotopic ages and biostratigraphy. This new palynozonation illustrates both intra- and inter-basinal floral response to Qinghai-Tibetan uplift and global climate change during the Paleogene, and it provides a framework for the age assignment of future palynological studies in Central Asia. Our work highlights the ongoing challenge of integrating various deep time records for the purpose of reconstructing palaeoelevation, indicating that a multi-proxy approach is vital for unravelling the complex uplift history of Tibet and its resulting influence on Asian climate.
DOI	10.5194/cp-16-2255-2020
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/33992
专题	盐湖地质与环境实验室中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Yuan, Qin,Barbolini, Natasha,Rydin, Catarina,et al. Aridification signatures from fossil pollen indicate a drying climate in east-central Tibet during the late Eocene[J]. CLIMATE OF THE PAST,2020,16(6):2255-2273.
APA	Yuan, Qin.,Barbolini, Natasha.,Rydin, Catarina.,Gao, Dong-Lin.,Wei, Hai-Cheng.,...&Vajda, Vivi.(2020).Aridification signatures from fossil pollen indicate a drying climate in east-central Tibet during the late Eocene.CLIMATE OF THE PAST,16(6),2255-2273.
MLA	Yuan, Qin,et al."Aridification signatures from fossil pollen indicate a drying climate in east-central Tibet during the late Eocene".CLIMATE OF THE PAST 16.6(2020):2255-2273.

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