globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117050
论文题名:
Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes
作者: Fang Z.; He X.; Zhang G.; Zhang X.; Shen Y.; Qin L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 570
语种: 英语
中文关键词: Cr isotopes ; mass extinction ; oceanic anoxia ; Permian-Triassic
英文关键词: Chromium ; Isotopes ; Biotics ; end-Permian ; Late Permian ; Mass extinction ; Oceanic anoxium ; Paleo-Tethys ; Permian-triassic ; Redox condition ; Temporal and spatial changes ; Triassic ; Deterioration ; carbonate ramp ; chromium ; isotopic composition ; isotopic ratio ; mass extinction ; paleoceanography ; Permian-Triassic boundary ; Phanerozoic ; redox conditions ; China
英文摘要: Multiple observations have shown that widespread oceanic anoxia may have played an important role in the end-Permian mass extinction and delayed biotic recovery in the Early Triassic. However, it has not been reached a consensus on the temporal and spatial changes in oceanic redox conditions at that time. Chromium (Cr) isotopes have been widely used to trace redox processes in surface environments. Here, we present the Cr isotope compositions (δ53Cr) of the Upper Permian–Lower Triassic carbonate ramp from the Xiakou section in South China (eastern Paleotethys). We observed largely fractionated δ53Cr values (1.15‰ to 2.16‰) in the latest Permian, which are higher than most values among Phanerozoic sedimentary carbonates. Such high values may result from Cr reduction facilitated by the development of a reducing environment during the latest Permian. The high Cr isotope ratios were followed by an abrupt negative excursion of δ53Cr values (from average 1.78‰ to average −0.13‰) across the extinction horizon, which may be attributed to a rapid expansion of oceanic anoxia in the eastern Paleotethys. Persistent negative δ53Cr values covering the Early Triassic indicate that the ocean may not have recovered from anoxia for an extended period. Our Cr isotope results support a stepwise deterioration of oceanic redox environments, which has been previously proposed as a possible cause of the most severe biotic catastrophe in the Phanerozoic. © 2021
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165461
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作者单位: CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, Hefei, 230026, China; CAS Center for Excellence in Comparative Planetology, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China

Recommended Citation:
Fang Z.,He X.,Zhang G.,et al. Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes[J]. Earth and Planetary Science Letters,2021-01-01,570
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