DOI: 10.1016/j.gloplacha.2015.10.018
论文题名: Carbon cycle perturbation expressed in terrestrial Permian–Triassic boundary sections in South China
作者: Cui Y. ; Bercovici A. ; Yu J. ; Kump L.R. ; Freeman K.H. ; Su S. ; Vajda V.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2017
卷: 148 起始页码: 272
结束页码: 285
语种: 英语
英文关键词: Carbon isotopes
; Mass extinction
; Organic matter
; Permian–Triassic boundary
; South China
Scopus关键词: Biogeochemistry
; Biological materials
; Ecology
; Ecosystems
; Geochronology
; Geology
; Isotopes
; Organic compounds
; Stratigraphy
; Carbon isotopes
; Depositional environment
; End Permian extinction
; Mass extinction
; Mass extinction events
; Permian-Triassic boundary
; South China
; Western guizhou and eastern yunnan
; Organic carbon
英文摘要: Stable isotopes of inorganic and organic carbon are commonly used in chemostratigraphy to correlate marine and terrestrial sedimentary sequences based on the assumption that the carbon isotopic signature of the exogenic carbon pool dominates other sources of variability. Here, sediment samples from four Permian–Triassic boundary (PTB) sections of western Guizhou and eastern Yunnan provinces in South China, representing a terrestrial to marine transitional setting, were analyzed for δ13C of organic matter (δ13Corg). These values were subsequently compared to published δ13C values of carbonates (δ13Ccarb) from the Global Stratotype Section and Point at Meishan and many other marine and terrestrial sections. A similar isotopic trend evident through all four sections is characterized by a negative shift of 2–3‰ at the top of the Xuanwei Formation, where we tentatively place the PTB. This negative shift also corresponds to a turnover in the vegetation and the occurrence of fungal spores, which is generally interpreted as a proliferation of decomposers and collapse of complex ecosystems during the end-Permian mass extinction event. Moreover, the absolute values of δ13Corg are more extreme in the more distal (marine) deposits. The δ13Corg values for the studied sediments are more variable compared to coeval δ13Ccarb records from marine records especially in the interval below the extinction horizon. We contend that the depositional environment influenced the δ13Corg values, but that the persisting geographic δ13Corg pattern through the extinction event across the four independent sections is an indication that the atmospheric δ13C signal left an indelible imprint on the geologic record related to the profound ecosystem change during the end-Permian extinction event. © 2015 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948845644&doi=10.1016%2fj.gloplacha.2015.10.018&partnerID=40&md5=dbc42e580356af89b7c872c3c3fb5d60
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11771
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Geosciences, The Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Cui Y.,Bercovici A.,Yu J.,et al. Carbon cycle perturbation expressed in terrestrial Permian–Triassic boundary sections in South China[J]. Global and Planetary Change,2017-01-01,148.