气候变化领域集成服务门户(CCPortal): Evidence of SPICE-related anoxia on the Laurentian passive margin: Paired δ13C and trace element chemostratigraphy of the upper Conasauga Group; Central Appalachian Basin

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DOI	10.1016/j.palaeo.2019.04.018
	Evidence of SPICE-related anoxia on the Laurentian passive margin: Paired δ13C and trace element chemostratigraphy of the upper Conasauga Group; Central Appalachian Basin
	Mackey J.E.; Stewart B.W.
发表日期	2019
ISSN	0031-0182
起始页码	160
结束页码	174
卷号	528
英文摘要	This study reports data from the Upper Cambrian Conasauga Group and overlying Copper Ridge Formation of the Central Appalachian region, eastern U.S.A. Geochemical, isotopic and petrographic analysis of core material was carried out to constrain the extent of marine anoxia and to characterize sediment fluxes on the carbonate platform and continental shelf of Laurentia contemporaneous with the Steptoean Positive Carbon Isotope Excursion (SPICE), a Late Cambrian global marine anoxic event. Carbonate rocks (primarily dolostone)record a positive δ13Ccarb excursion starting in the middle Nolichucky Formation, reaching its peak (+4.3‰)at the boundary between the Maynardville and Copper Ridge formations. Strontium isotope ratios in the dolostone units are only slightly offset from the expected Cambrian seawater values, suggesting minimal post-diagenetic disturbance of isotopic and trace element systematics. Selective leaching of carbonate units reveal upward decreasing trends in dissolved redox-sensitive trace metals (e.g., U, Ni, V)indicative of drawdown from regional and global marine anoxia during the peak of the Late Cambrian SPICE event. © 2019 Elsevier B.V.
英文关键词	Anoxia; Carbonate; Isotope excursion; Paleoredox; Paleozoic; REE
语种	英语
scopus关键词	anoxia; Cambrian; carbonate platform; chemostratigraphy; continental shelf; dolostone; drawdown; leaching; Paleozoic; Appalachian Basin
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/150926
作者单位	Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, PA 15260, United States
推荐引用方式 GB/T 7714	Mackey J.E.,Stewart B.W.. Evidence of SPICE-related anoxia on the Laurentian passive margin: Paired δ13C and trace element chemostratigraphy of the upper Conasauga Group; Central Appalachian Basin[J],2019,528.
APA	Mackey J.E.,&Stewart B.W..(2019).Evidence of SPICE-related anoxia on the Laurentian passive margin: Paired δ13C and trace element chemostratigraphy of the upper Conasauga Group; Central Appalachian Basin.Palaeogeography, Palaeoclimatology, Palaeoecology,528.
MLA	Mackey J.E.,et al."Evidence of SPICE-related anoxia on the Laurentian passive margin: Paired δ13C and trace element chemostratigraphy of the upper Conasauga Group; Central Appalachian Basin".Palaeogeography, Palaeoclimatology, Palaeoecology 528(2019).