气候变化领域集成服务门户(CCPortal): The Geochemical Characteristics and Environmental Implications of the Paleocene-Eocene in the Jiangling Depression, Southwestern Jianghan Basin

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DOI	10.3390/min14030234
	The Geochemical Characteristics and Environmental Implications of the Paleocene-Eocene in the Jiangling Depression, Southwestern Jianghan Basin
	Yan, Kai; Wang, Chunlian; Chen, Renyi; Wang, Jiuyi; Li, Ruiqin; Liu, Lihong
发表日期	2024
EISSN	2075-163X
起始页码	14
结束页码	3
卷号	14 期号:3
英文摘要	Various isotopic and palynological indicators have shown interspersed periods of aridity and humidity for the late Paleocene to early Eocene in central China, so the paleoclimate conditions remain unclear. This research investigates the environmental characteristics of a saline lake in the Jiangling depression, southwestern Jianghan Basin, from the Paleocene to the Eocene, using bulk-rock geochemistry in a 1280 m sediment core. The ratios of FeO/MnO, Al2O3/MgO, and C-value indicate a semi-humid to semi-arid climate in the early-middle Paleocene. There was a rapid shift to a humid climate during the late Paleocene to early Eocene, following a short time of intense dryness. The Eocene climate was arid, but experienced intermittent humidity. The variation trend of the CIA, CIW and PIA was similar to that of FeO/MnO, Al2O3/MgO, and the C-value, so chemical weathering of the surrounding rocks was controlled by climate change. The lake redox conditions in the Jiangling depression from the Paleocene to the Eocene were reconstructed using the ratios of U/Th, Ni/Co, and V/Cr. During humidity and alternations of aridity and humidity, the lake water received external water input, resulting in weak stratification, so the sediments were in oxidizing conditions. During aridity, lakes become endorheic, leading to sediments forming in reduced conditions. The salinity of the lake in the Jiangling depression from the Paleocene to the Eocene was determined through analysis of sedimentary sequences and the trend of the Sr/Ba ratio. In the early-middle Paleocene, lake salinity varied greatly. From the late Paleocene to the early Eocene, lake salinity decreased. In the Eocene, lake salinity increased and halite precipitated, but lake salinity finally decreased due to a humid climate. During the late Paleocene-early Eocene, the occurrence of multiple humid climates in the Jiangling depression were not merely regional effects. The most significant humidity was caused by a global hyperthermal (PETM), which caused a huge increase in precipitation in the whole of East Asia and even in low latitudes around the world.
英文关键词	Jiangling depression; Paleocene-Eocene saline lake; climate; redox conditions; salinity
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001192418200001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305319
作者单位	China Geological Survey; Chinese Academy of Geological Sciences; University of Iceland; Peking University; State University of New York (SUNY) System; State University of New York (SUNY) Binghamton; China Geological Survey
推荐引用方式 GB/T 7714	Yan, Kai,Wang, Chunlian,Chen, Renyi,et al. The Geochemical Characteristics and Environmental Implications of the Paleocene-Eocene in the Jiangling Depression, Southwestern Jianghan Basin[J],2024,14(3).
APA	Yan, Kai,Wang, Chunlian,Chen, Renyi,Wang, Jiuyi,Li, Ruiqin,&Liu, Lihong.(2024).The Geochemical Characteristics and Environmental Implications of the Paleocene-Eocene in the Jiangling Depression, Southwestern Jianghan Basin.MINERALS,14(3).
MLA	Yan, Kai,et al."The Geochemical Characteristics and Environmental Implications of the Paleocene-Eocene in the Jiangling Depression, Southwestern Jianghan Basin".MINERALS 14.3(2024).