气候变化领域集成服务门户(CCPortal): Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes

CCPortal

DOI	10.1016/j.epsl.2021.117050
	Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes
	Fang Z.; He X.; Zhang G.; Zhang X.; Shen Y.; Qin L.
发表日期	2021
ISSN	0012821X
卷号	570
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
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203083
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
推荐引用方式 GB/T 7714	Fang Z.,He X.,Zhang G.,et al. Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes[J],2021,570.
APA	Fang Z.,He X.,Zhang G.,Zhang X.,Shen Y.,&Qin L..(2021).Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes.Earth and Planetary Science Letters,570.
MLA	Fang Z.,et al."Ocean redox changes from the latest Permian to Early Triassic recorded by chromium isotopes".Earth and Planetary Science Letters 570(2021).