气候变化领域集成服务门户(CCPortal): Middle Eocene Paleoenvironmental Reconstruction in the Gonjo Basin, Eastern Tibetan Plateau: Evidence From Palynological and Evaporite Records

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DOI	10.3389/feart.2022.818418
	Middle Eocene Paleoenvironmental Reconstruction in the Gonjo Basin, Eastern Tibetan Plateau: Evidence From Palynological and Evaporite Records
	Wang, Licheng; Yuan, Qin; Shen, Lijian; Ding, Lin
通讯作者	Wang, LC (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	The early uplift of the Tibetan Plateau (TP) had a profound influence on the paleoenvironment and paleoclimate. However, we still have little information about the link between the paleoclimatic changes and flora ecosystem caused by the uplift. The Eocene fluvial-lacustrine sequences in the Gonjo Basin, eastern TP, provide excellent archives of the paleoecological and paleoclimatic responses to the surface uplift of the TP. In this study, we investigated a section of the middle Eocene Ranmugou Formation (47.8->44 Ma) and used the sporomorphs assemblages, sedimentology, and geochemistry of the evaporites to reconstruct the paleoclimate and paleovegetation. The palynological assemblages and coexistence analysis reveal that the middle Eocene ecosystem in the Gonjo Basin was dominated by warm and humid temperate deciduous broad-leaved forests. The Sr-87/Sr-86 ratios (0.709942-0.710062) of all of the gypsum samples are higher than those of contemporaneous seawater, while the delta S-34 values (10.3-11.0%) are much lower, indicating a lacustrine environment. Combined with published palynological and paleoelevation data for eastern Tibetan lacustrine basins, we infer that the paleoenvironment changed from warm and humid deciduous broad-leaved forests during 47.8->44 Ma, to cool and arid temperate forest during 44-40 Ma in the Gonjo Basin, and to arid and cool steppe-desert vegetation in the late Eocene Nangqian Basin. The changes in the paleoclimate and vegetation were primarily driven by the surface uplift of the Central Watershed Mountain, the high topography of which blocked the moisture from the Asian Eocene monsoon.
关键词	HOH XIL BASIN COEXISTENCE APPROACH MONSOON PREVALENCE CLIMATE-CHANGE XINING BASIN POLLEN UPLIFT CHINA ARIDIFICATION STRATIGRAPHY
英文关键词	palynology; vegetation; paleoclimate; paleoenvironment; Gonjo Basin; Tibetan plateau
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000760793000001
来源期刊	FRONTIERS IN EARTH SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260602
推荐引用方式 GB/T 7714	Wang, Licheng,Yuan, Qin,Shen, Lijian,et al. Middle Eocene Paleoenvironmental Reconstruction in the Gonjo Basin, Eastern Tibetan Plateau: Evidence From Palynological and Evaporite Records[J]. 中国科学院青藏高原研究所,2022,10.
APA	Wang, Licheng,Yuan, Qin,Shen, Lijian,&Ding, Lin.(2022).Middle Eocene Paleoenvironmental Reconstruction in the Gonjo Basin, Eastern Tibetan Plateau: Evidence From Palynological and Evaporite Records.FRONTIERS IN EARTH SCIENCE,10.
MLA	Wang, Licheng,et al."Middle Eocene Paleoenvironmental Reconstruction in the Gonjo Basin, Eastern Tibetan Plateau: Evidence From Palynological and Evaporite Records".FRONTIERS IN EARTH SCIENCE 10(2022).