DOI: 10.1016/j.epsl.2019.116044
论文题名: Carbon isotope and mammal recovery from extreme greenhouse warming at the Paleocene–Eocene boundary in astronomically-calibrated fluvial strata, Bighorn Basin, Wyoming, USA
作者: van der Meulen B. ; Gingerich P.D. ; Lourens L.J. ; Meijer N. ; van Broekhuizen S. ; van Ginneken S. ; Abels H.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534 语种: 英语
中文关键词: age model
; Bighorn Basin
; carbon isotope excursion
; initial recovery step
; mammalian evolution
; Paleocene–Eocene Thermal Maximum
英文关键词: Greenhouses
; Isotopes
; Mammals
; Recovery
; Sedimentology
; Stratigraphy
; Age modeling
; Bighorn basins
; Carbon isotope excursions
; initial recovery step
; mammalian evolution
; Thermal maxima
; Carbon
; carbon isotope
; carbonate
; facies analysis
; fluvial landform
; fossil record
; global warming
; greenhouse gas
; mammal
; Paleocene-Eocene boundary
; stratigraphy
; Bighorn Basin
; United States
; Wyoming
; Mammalia
英文摘要: Massive addition of isotopically-depleted carbon to the ocean and atmosphere caused a carbon isotope excursion (CIE) and global greenhouse warming during the Paleocene–Eocene Thermal Maximum (PETM) circa 56 million years ago. The body of the CIE is followed by a recovery interval that is key to understanding Earth's capacity for carbon uptake, mechanisms of carbon uptake, and biotic responses following an extreme greenhouse warming event. Expanded terrestrial stratigraphic sections in the Bighorn Basin of Wyoming provide exceptionally high-resolution records of the CIE and can be linked directly to the mammalian fossil record. Here, we provide carbon isotope records of unprecedented resolution measured on in-situ pedogenic carbonate nodules in two parallel 8-km-spaced sections of upper Paleocene and lower Eocene fluvial sediments in the northern Bighorn Basin. We find consistent precession-driven sedimentary cycles in the two sections. Cycle thicknesses show significant lateral, and thus vertical, variation, demonstrating that astronomical age models constructed for fluvial successions require detailed sedimentary facies analysis of parallel sites. Plotting the high-resolution carbon isotope records in time using our astronomical age model for the correlated sections indicates a CIE body duration of 101 ± 9 kyr. The CIE shows an initial recovery step of +2.7 ± 1.0‰. This step occurs across the single, well-developed paleosol marker bed known as Purple-4, which represents a time interval of up to 15 kyr. The rapidity of recovery at the end of the CIE body is remarkable in light of existing hypotheses for carbon removal from the ocean–atmosphere system. Concurrent mammal finds show that the transition from faunal zone Wa-0 to faunal zone Wa-1 occurred in two steps, with a transitional Wa-R fauna preceding the CIE initial recovery step and Wa-1 fauna following the step. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165323
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, Utrecht University, Princetonlaan 8a, Utrecht, 3584 CB, Netherlands; Museum of Paleontology, University of Michigan, Ann Arbor, MI 48109-1079, United States; Institute of Geosciences, University of Potsdam, Karl-Liebknecht-Straße 24-25, Potsdam-Golm, 14476, Germany; Department of Geoscience and Engineering, Delft University of Technology, Stevinweg 1, Delft, 2628 CN, Netherlands
Recommended Citation:
van der Meulen B.,Gingerich P.D.,Lourens L.J.,et al. Carbon isotope and mammal recovery from extreme greenhouse warming at the Paleocene–Eocene boundary in astronomically-calibrated fluvial strata, Bighorn Basin, Wyoming, USA[J]. Earth and Planetary Science Letters,2020-01-01,534