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DOI	10.1016/j.earscirev.2020.103229
	On the onset of Central Atlantic Magmatic Province (CAMP) volcanism and environmental and carbon-cycle change at the Triassic–Jurassic transition (Neuquén Basin, Argentina)
	Ruhl M.; Hesselbo S.P.; Al-Suwaidi A.; Jenkyns H.C.; Damborenea S.E.; Manceñido M.O.; Storm M.; Mather T.A.; Riccardi A.C.
发表日期	2020
ISSN	00128252
卷号	208
英文摘要	The Triassic–Jurassic transition is characterized by the end-Triassic mass extinction approximately synchronous with the onset of emplacement of the Central Atlantic Magmatic Province (CAMP), and associated with a major negative carbon-isotope excursion (CIE) affecting the ocean–atmosphere system. Here, we present new data (total organic carbon, pyrolysis analysis, carbon-isotopes from bulk organic matter, elemental mercury, and other elemental contents) from a southern-hemisphere Triassic–Jurassic boundary succession in the Neuquén Basin, Argentina. The end-Triassic mass extinction there coincides with a relatively small (2–3‰) negative CIE in bulk organic matter, and we present a model that suggests that extreme aridity across the western Pangaean landmass may have resulted in rather limited terrestrial organic-matter flux to the sedimentary realm in eastern Panthalassic marine basins, hypothetically reducing the magnitude of the observed negative CIE in δ13CTOC. Increased deposition of sedimentary Hg (and Hg/TOC and Hg/Zr) in the marine Neuquén Basin began stratigraphically before the negative CIE associated with the end-Triassic mass extinction, and thus before the commencement, in North America and Africa, of CAMP-related basaltic volcanism, but possibly coinciding with the early emplacement of CAMP-associated intrusives (dykes and sills). This relative chronology suggests thermal alteration of intruded country rocks and/or intrusive magmatic degassing of Hg as potential major sources of elevated Hg fluxes to the atmosphere at this time. The Neuquén Basin experienced the development of dysoxic–anoxic marine conditions across the Triassic–Jurassic transition, enabling increased preservation of organic matter. Simple mass-balance calculations show that enhanced carbon burial rates can explain the inferred evolution of the global exogenic carbon cycle across this time-interval. © 2020 Elsevier B.V.
关键词	Anoxia CAMP volcanism Carbon-cycle change Mercury (Hg)Palaeo-climate change Triassic–Jurassic mass extinction
英文关键词	carbon cycle; deposition; dike; emplacement; environmental change; igneous intrusion; Jurassic; magmatism; mass extinction; sill; thermal alteration; transition zone; Triassic; volcanism; Argentina; Atlantic Ocean; Atlantic Ocean (Central); Neuquen Basin
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203870
作者单位	Department of Geology, Trinity College Dublin, The University of Dublin, College Green Dublin 2, Dublin, Ireland; Department of Earth Sciences, University of Oxford, South Park Road, Oxford, OX1 3AN, United Kingdom; Camborne School of Mines and Environment and Sustainability Institute, University of Exeter, Penryn, TR10 9FE, United Kingdom; Department of Earth Sciences, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates; Departamento Paleontología Invertebrados, Museo de Ciencias Naturales La Plata, Paseo del Bosque s/n, La Plata, 1900, Argentina; Department of Earth Sciences, Stellenbosch University, Stellenbosch, 7600, South Africa
推荐引用方式 GB/T 7714	Ruhl M.,Hesselbo S.P.,Al-Suwaidi A.,等. On the onset of Central Atlantic Magmatic Province (CAMP) volcanism and environmental and carbon-cycle change at the Triassic–Jurassic transition (Neuquén Basin, Argentina)[J],2020,208.
APA	Ruhl M..,Hesselbo S.P..,Al-Suwaidi A..,Jenkyns H.C..,Damborenea S.E..,...&Riccardi A.C..(2020).On the onset of Central Atlantic Magmatic Province (CAMP) volcanism and environmental and carbon-cycle change at the Triassic–Jurassic transition (Neuquén Basin, Argentina).Earth Science Reviews,208.
MLA	Ruhl M.,et al."On the onset of Central Atlantic Magmatic Province (CAMP) volcanism and environmental and carbon-cycle change at the Triassic–Jurassic transition (Neuquén Basin, Argentina)".Earth Science Reviews 208(2020).