DOI: 10.1016/j.gr.2019.09.013
论文题名: Middle Permian organic carbon isotope stratigraphy and the origin of the Kamura Event
作者: Zhang B. ; Yao S. ; Mills B.J.W. ; Wignall P.B. ; Hu W. ; Liu B. ; Ren Y. ; Li L. ; Shi G.
刊名: Gondwana Research
ISSN: 1342937X
出版年: 2020
卷: 79 语种: 英语
英文关键词: Capitanian mass extinction
; Carbon cycle
; Chemostratigraphy
; Emeishan volcanism
; Guadalupian
英文摘要: Large carbon cycle perturbations associated with the Middle Permian (Capitanian) mass extinction have been widely reported, but their causes and timing are still in dispute. Low resolution carbon isotope records prior to this event also limit the construction of a Middle Permian chemostratigraphic framework and global or local stratigraphic correlation, and hence limit our understanding of carbon cycle and environmental changes. To investigate these issues, we analyzed the 13Corg values from the Middle Permian chert-mudstone sequence (Gufeng Formation) in the Lower Yangtze deep-water basin (South China) and compared them with published records to build a chemostratigraphic scheme and discuss the underlying environmental events. The records show increased δ13Corg values from late Kungurian to early Guadalupian, followed by a decrease to the late Wordian/early Capitanian. The early-mid Capitanian was characterized by elevated δ13Corg values suggesting the presence of the “Kamura Event”: an interval of heavy positive values seen in the δ13Ccarb record. We propose that these heavy Capitanian δ13C values may be a response to a marked decline in chemical weathering rates on Pangea and associated reduction in carbonate burial, which we show using a biogeochemical model. The subsequent negative δ13C excursion seen in some carbonate records, especially in shallower-water sections (and in a muted expression in organic carbon) coincide with the Capitanian mass extinction may be caused by the input of isotopically-light carbon sourced from the terrestrial decomposition of organic matter. © 2019 International Association for Gondwana Research Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159129
Appears in Collections: 气候变化与战略
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作者单位: MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, United Kingdom; Nanjing Geological Survey Center, China Geological Survey, Nanjing, 210016, China
Recommended Citation:
Zhang B.,Yao S.,Mills B.J.W.,et al. Middle Permian organic carbon isotope stratigraphy and the origin of the Kamura Event[J]. Gondwana Research,2020-01-01,79