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Carbon cycle pertur...
Carbon cycle perturbation expressed in terrestrial Permian–Triassic boundary sections in South China
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- Cui, Ying (författare)
- Department of Geosciences, The Pennsylvania State University, University Park, PA, United States
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- Bercovici, Antoine (författare)
- Department of Geology, Lund University, Lund, Sweden
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- Yu, Jianxin (författare)
- State Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences (Wuhan), People's Republic of China
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- Kump, Lee R. (författare)
- Department of Geosciences, The Pennsylvania State University, University Park, PA, United States
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- Freeman, Katherine (författare)
- Department of Geosciences, The Pennsylvania State University, University Park, PA, United States
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- Su, Shangguo (författare)
- School of Earth Sciences and Resources, China University of Geosciences (Beijing), People's Republic of China
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- Vajda, Vivi (författare)
- Naturhistoriska riksmuseet,Enheten för paleobiologi,Department of Geology, Lund University, Sweden
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(creator_code:org_t)
- Amsterdam : Elsevier, 2017
- 2017
- Engelska.
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Ingår i: Global and Planetary Change. - Amsterdam : Elsevier. - 0921-8181 .- 1872-6364. ; 148, s. 272-285
- Relaterad länk:
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http://dx.doi.org/10...
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https://nrm.diva-por... (primary) (Raw object)
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http://manuscript.el...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Stable isotopes of inorganic and organic carbon are commonly used in chemostratigraphy to correlatemarine andterrestrial sedimentary sequences based on the assumption that the carbon isotopic signature of the exogenic carbon pool dominates other sources of variability. Here, sediment samples fromfour Permian–Triassic boundary (PTB) sections ofwesternGuizhou and eastern Yunnan provinces in South China, representing a terrestrial tomarine transitional setting,were analyzed for δ13C of organic matter (δ13Corg). These valueswere 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 aremore 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Carbon isotopes
- Organic matter
- Permian–Triassic boundary
- South China
- Mass extinction
- Ecosystems and species history
- Ekosystem och arthistoria
- The changing Earth
- Den föränderliga jorden
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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