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DOI	10.1130/B31818.1
	Global perturbation of the marine calcium cycle during the Permian-Triassic transition
	Silva-Tamayo J.C.; Lau K.V.; Jost A.B.; Payne J.L.; Wignall P.B.; Newton R.J.; Eisenhauer A.; Depaolo D.J.; Brown S.; Maher K.; Lehrmann D.J.; Altiner D.; Yu M.; Richoz S.; Paytan A.
发表日期	2018
ISSN	167606
起始页码	1323
结束页码	1338
卷号	130 期号:2021-07-08
英文摘要	A negative shift in the calcium isotopic composition of marine carbonate rocks spanning the end-Permian extinction horizon in South China has been used to argue for an ocean acidification event coincident with mass extinction. This interpretation has proven controversial, both because the excursion has not been demonstrated across multiple, widely separated localities, and because modeling results of coupled carbon and calcium isotope records illustrate that calcium cycle imbalances alone cannot account for the full magnitude of the isotope excursion. Here, we further test potential controls on the Permian-Triassic calcium isotope record by measuring calcium isotope ratios from shallow-marine carbonate successions spanning the Permian-Triassic boundary in Turkey, Italy, and Oman. All measured sections display negative shifts in δ44/40Ca of up to 0.6‰. Consistency in the direction, magnitude, and timing of the calcium isotope excursion across these widely separated localities implies a primary and global δ44/40Ca signature. Based on the results of a coupled box model of the geological carbon and calcium cycles, we interpret the excursion to reflect a series of consequences arising from volcanic CO2 release, including a temporary decrease in seawater δ44/40Ca due to short-lived ocean acidification and a more protracted increase in calcium isotope fractionation associated with a shift toward more primary aragonite in the sediment and, potentially, subsequently elevated carbonate saturation states caused by the persistence of elevated CO2 delivery from volcanism. Locally, changing balances between aragonite and calcite production are sufficient to account for the calcium isotope excursions, but this effect alone does not explain the globally observed negative excursion in the δ13C values of carbonate sediments and organic matter as well. Only a carbon release event and related geochemical consequences are consistent both with calcium and carbon isotope data. The carbon release scenario can also account for oxygen isotope evidence for dramatic and protracted global warming as well as paleontological evidence for the preferential extinction of marine animals most susceptible to acidification, warming, and anoxia. © 2018 The Authors.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185003
作者单位	Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77004, United States; Testlab Geo-Ambiental, Cra 45D #60-16, Medellin, Antioquia, Colombia; Department of Geological Sciences, Stanford University, Stanford, CA 94305, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Earth and Environmental Sciences, The University of Leeds, Leeds, LS2 9JT, United Kingdom; Helmholtz Center for Ocean Research, GEOMAR- Kiel, Kiel, 94148, Germany; Department of Earth and Planetary Sciences, University of California, Berkeley, Berkeley, CA 94720, United States; Department of Geosciences, Trinity University, San Antonio, TX 78212, United States; Department of Geological Engineering, Middle East Technical University, Ankara, çankaya, 06800, Turkey; College of Resource and Environment Engineering, Guizhou University, Caijiaguan, Guiyang, Guizhou, 550003, China; Institut für Erdwissens...
推荐引用方式 GB/T 7714	Silva-Tamayo J.C.,Lau K.V.,Jost A.B.,et al. Global perturbation of the marine calcium cycle during the Permian-Triassic transition[J],2018,130(2021-07-08).
APA	Silva-Tamayo J.C..,Lau K.V..,Jost A.B..,Payne J.L..,Wignall P.B..,...&Paytan A..(2018).Global perturbation of the marine calcium cycle during the Permian-Triassic transition.Bulletin of the Geological Society of America,130(2021-07-08).
MLA	Silva-Tamayo J.C.,et al."Global perturbation of the marine calcium cycle during the Permian-Triassic transition".Bulletin of the Geological Society of America 130.2021-07-08(2018).