干旱区生态环境知识资源中心(Arid): Magnesium Isotopes of Carbonate Reveal Seasonal Climate Variation in the Central East Asia During the Middle Eocene

Arid

DOI	10.1029/2024GL108623
	Magnesium Isotopes of Carbonate Reveal Seasonal Climate Variation in the Central East Asia During the Middle Eocene
	Zhu, Huaxi; Hu, Rong; Li, Weiqiang; Long, Yinshuang; Lai, Wen; Zhang, Yang; Zhang, Xia; Guo, Yangrui; Ji, Junfeng; Lu, Huayu
通讯作者	Hu, R
来源期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2024
卷号	51 期号:10
英文摘要	It is debated whether there was strong climate seasonality during the Eocene, which provides a close geological analogy for near-future scenarios of greenhouse gas emissions. Lithological data suggest the existence of a broad arid zone centered around 30 degrees N paleo-latitude, while a humid climate was supported by palaeobotanic assemblages in East Asia. Here, we report the occurrence of massive primary lacustrine dolomite and magnesite in the central East Asia during the middle Eocene. We provide a novel perspective from magnesium isotopes to link the formation of Mg-carbonates to seasonal dry-wet cycles. Rapid magnesium input during the rainy season and intense evaporation in the dry season likely caused the formation of magnesium carbonates in an enclosed lake. These findings provide insights into hydroclimatic seasonality during the Eocene, contributing to our understanding of the hydrological cycle response to a greenhouse climate. The Eocene epoch serves as a valuable analog for future climates. While geochemical reconstructions and model simulations have illuminated lower thermal latitudinal gradients and seasonal variations, our understanding of Eocene precipitation patterns lags, encompassing wet-dry conditions and seasonal dynamics. To enhance our understanding of Eocene precipitation patterns, we investigated a 158-m-thick primary dolomite and magnesite deposition in the middle Eocene lacustrine succession of the Lushi Basin, central China. From a novel perspective, we provide evidence from magnesium isotopes to link the formation of Mg-carbonates to climate seasonality. Clumped isotopes (triangle 47) and Mg isotopes provide evidence supporting the formation under specific hydroclimatic conditions. A surge in magnesium input during the rainy season, succeeded by intense evaporation in the dry season, likely led to the development of extensive Mg carbonate layers in an enclosed lake. The prevalence of seasonal variations in precipitation in the central East Asia during the middle Eocene is further substantiated by a compilation of the occurrence of Eocene lacustrine Mg-carbonates in this region. Our findings suggest that while Eocene temperature seasonal variability was weak, significant precipitation seasonality could have coexisted. Magnesium isotopes of Eocene lacustrine dolomites and magnesites provide insight into the presence of seasonal precipitation variation Mg-carbonate formation was linked to hydroclimatic seasonality characterized by alternation between heavy rainfall and strong evaporation Weak temperature seasonal variation and significant precipitation seasonality could have coexisted in central East Asia during the Eocene
英文关键词	Eocene climate seasonality precipitation pattern Mg-carbonate Mg isotopes lacustrine succession
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001217189000001
WOS关键词	MG ISOTOPES ; TECTONIC EVOLUTION ; AQUEOUS-SOLUTION ; OXYGEN-ISOTOPE ; DOLOMITE ; TEMPERATURE ; PRECIPITATION ; FRACTIONATION ; CHINA ; DOLOMITIZATION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403954
推荐引用方式 GB/T 7714	Zhu, Huaxi,Hu, Rong,Li, Weiqiang,et al. Magnesium Isotopes of Carbonate Reveal Seasonal Climate Variation in the Central East Asia During the Middle Eocene[J],2024,51(10).
APA	Zhu, Huaxi.,Hu, Rong.,Li, Weiqiang.,Long, Yinshuang.,Lai, Wen.,...&Lu, Huayu.(2024).Magnesium Isotopes of Carbonate Reveal Seasonal Climate Variation in the Central East Asia During the Middle Eocene.GEOPHYSICAL RESEARCH LETTERS,51(10).
MLA	Zhu, Huaxi,et al."Magnesium Isotopes of Carbonate Reveal Seasonal Climate Variation in the Central East Asia During the Middle Eocene".GEOPHYSICAL RESEARCH LETTERS 51.10(2024).