气候变化领域集成服务门户(CCPortal): Pulses of enhanced continental weathering associated with multiple Late Devonian climate perturbations: Evidence from osmium-isotope compositions

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DOI	10.1016/j.palaeo.2019.03.036
	Pulses of enhanced continental weathering associated with multiple Late Devonian climate perturbations: Evidence from osmium-isotope compositions
	Percival L.M.E.; Selby D.; Bond D.P.G.; Rakociński M.; Racki G.; Marynowski L.; Adatte T.; Spangenberg J.E.; Föllmi K.B.
发表日期	2019
ISSN	0031-0182
起始页码	240
结束页码	249
卷号	524
英文摘要	Anomalously high rates of continental weathering have frequently been proposed as a key stimulus for the development of widespread marine anoxia during a number of Late Devonian environmental and biospheric crises, which included a major mass extinction during the Frasnian–Famennian transition (marked by the Upper and Lower Kellwasser horizons). Here, this model is investigated by presenting the first stratigraphic record of osmium-isotope trends ( 187 Os/ 188 Os) in upper Devonian strata from the Kowala Quarry (Holy Cross Mountains, Poland). Changes in reconstructed 187 Os/ 188 Os seawater values to more radiogenic compositions are documented at the base of both the Lower (~0.42 to ~0.83) and Upper (~0.31 to ~0.81) Kellwasser horizons characteristic of the Frasnian–Famennian transition, and additionally within upper Famennian shales that record a more minor environmental perturbation known as the Annulata Event (~0.20 to ~0.53). These shifts indicate the occurrence of extremely enhanced continental weathering rates at the onsets of the Kellwasser crises and during the later Annulata Event. The similarity of 187 Os/ 188 Os values in this study from Frasnian–Famennian boundary and lower Famennian strata (between 0.4 and 0.5) to those from North American stratigraphic equivalents suggests that the 187 Os/ 188 Os values record global trends. These findings support a causal relationship between increased continental weathering (and thus, nutrient supply to the marine shelf) and the environmental perturbations that occurred during numerous Late Devonian events, including both of the biospherically catastrophic Kellwasser crises as well as other, less severe, oceanic anoxic events. © 2019 Elsevier B.V.
英文关键词	Annulata event; Frasnian–Famennian extinction; Kellwasser horizons; Kowala quarry; Marine anoxia; Nutrient runoff
语种	英语
scopus关键词	anoxic conditions; continental lithosphere; Devonian; Frasnian-Famennian boundary; isotopic composition; marine environment; mass extinction; nutrient dynamics; nutrient limitation; osmium isotope; paleoclimate; perturbation; quarry; runoff; sequence stratigraphy; trend analysis; weathering; Poland [Central Europe]; Swietokrzyskie; Swietokrzyskie Mountains
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150970
作者单位	Institute of Earth Sciences, University of Lausanne, Géopolis, Lausanne, 1015, Switzerland; Department of Earth Sciences, Durham University, Durham, DH1 3LE, United Kingdom; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China; Department of Geography, Geology and Environment, University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom; Faculty of Earth Sciences, University of Silesia, Będzińska 60, Sosnowiec, 41-200, Poland; Institute of Earth Surface Dynamics, University of Lausanne, Géopolis, Lausanne, 1015, Switzerland
推荐引用方式 GB/T 7714	Percival L.M.E.,Selby D.,Bond D.P.G.,et al. Pulses of enhanced continental weathering associated with multiple Late Devonian climate perturbations: Evidence from osmium-isotope compositions[J],2019,524.
APA	Percival L.M.E..,Selby D..,Bond D.P.G..,Rakociński M..,Racki G..,...&Föllmi K.B..(2019).Pulses of enhanced continental weathering associated with multiple Late Devonian climate perturbations: Evidence from osmium-isotope compositions.Palaeogeography, Palaeoclimatology, Palaeoecology,524.
MLA	Percival L.M.E.,et al."Pulses of enhanced continental weathering associated with multiple Late Devonian climate perturbations: Evidence from osmium-isotope compositions".Palaeogeography, Palaeoclimatology, Palaeoecology 524(2019).