气候变化领域集成服务门户(CCPortal): Magnetostratigraphic constraints on the fossiliferous Ulantatal sequence in Inner Mongolia, China: Implications for Asian aridification and faunal turnover before the Eocene-Oligocene boundary

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DOI	10.1016/j.epsl.2020.116125
	Magnetostratigraphic constraints on the fossiliferous Ulantatal sequence in Inner Mongolia, China: Implications for Asian aridification and faunal turnover before the Eocene-Oligocene boundary
	Wasiljeff J.; Kaakinen A.; Salminen J.M.; Zhang Z.
发表日期	2020
ISSN	0012821X
卷号	535
英文摘要	The transition from Eocene to Oligocene and its implications in the terrestrial realm has been a focal target for Cenozoic climate and environment research as it is widely considered the most dramatic climatic shift of the past 50 million years. Tibetan Plateau and proximal areas have been of utmost interest since the biogeographic relationships and understanding of the depositional environments in the region have remained unsettled during and after the Eocene-Oligocene transition (EOT). This study derives a first chronostratigraphic framework for Ulantatal, a fossiliferous area in Inner Mongolia, China. Based on paleomagnetic reversal stratigraphy and the constraints of faunal correlations, the time spanned in the strata is between ca. 35 and 27 Ma, thus exposing a long sedimentary succession ranging from the latest Eocene to late Oligocene. The lithological characteristics reveal these extensive fine-grained sediments mainly originate from eolian dust deposition, the onset of which is constrained at the latest Eocene (ca. 34.8 Ma). The presence of post “Mongolian Remodeling” fauna already in the late Eocene of Ulantatal demonstrates unequivocally that the major faunal turnover preceded the Eocene-Oligocene boundary, earlier to what has been recorded from other East Asian localities. The faunal composition predominated by rodents and lagomorphs remains strikingly stable across the Eocene-Oligocene boundary, suggesting the EOT related change in the animal communities was gradual or stepwise rather than abrupt. Moreover, the turnover into this environment dominated by small mammals can be linked with Eocene aridification of Asia, highlighting the dynamic responses of terrestrial systems to changing environment and climate associated with the EOT. © 2020 The Author(s)
关键词	Asian aridification Eocene-Oligocene boundary eolian dust magnetostratigraphy mammalian fossils Mongolian Remodeling
英文关键词	Deposition; Dust; Lithology; Stratigraphy; Aridification; Eocene-oligocene boundary; Eolian dust; Magnetostratigraphy; mammalian fossils; Mongolians; Mammals; aridification; chronostratigraphy; Eocene-Oligocene boundary; eolian deposit; fauna; fine grained sediment; fossil; magnetostratigraphy; mammal; paleoclimate; paleoenvironment; sequence stratigraphy; China; Nei Monggol; Animalia; Lagomorpha; Mammalia; Rodentia
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202962
作者单位	Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, Helsinki, 00014, Finland; Department of Physics, University of Helsinki, P.O. Box 64, Helsinki, 00014, Finland; Key Laboratory of Vertebrate Evolution and Human Origin of the Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, China; CAS Center for Excellence in Life and Paleoenvironment, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Wasiljeff J.,Kaakinen A.,Salminen J.M.,et al. Magnetostratigraphic constraints on the fossiliferous Ulantatal sequence in Inner Mongolia, China: Implications for Asian aridification and faunal turnover before the Eocene-Oligocene boundary[J],2020,535.
APA	Wasiljeff J.,Kaakinen A.,Salminen J.M.,&Zhang Z..(2020).Magnetostratigraphic constraints on the fossiliferous Ulantatal sequence in Inner Mongolia, China: Implications for Asian aridification and faunal turnover before the Eocene-Oligocene boundary.Earth and Planetary Science Letters,535.
MLA	Wasiljeff J.,et al."Magnetostratigraphic constraints on the fossiliferous Ulantatal sequence in Inner Mongolia, China: Implications for Asian aridification and faunal turnover before the Eocene-Oligocene boundary".Earth and Planetary Science Letters 535(2020).