globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116125
论文题名:
Magnetostratigraphic constraints on the fossiliferous Ulantatal sequence in Inner Mongolia, China: Implications for Asian aridification and faunal turnover before the Eocene-Oligocene boundary
作者: Wasiljeff J.; Kaakinen A.; Salminen J.M.; Zhang Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 535
语种: 英语
中文关键词: 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
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)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165340
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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,535
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