气候变化领域集成服务门户(CCPortal): Distribution of pyrolytic PAHs across the Triassic-Jurassic boundary in the Sichuan Basin, southwestern China: Evidence of wildfire outside the Central Atlantic Magmatic Province

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DOI	10.1016/j.earscirev.2019.102970
	Distribution of pyrolytic PAHs across the Triassic-Jurassic boundary in the Sichuan Basin, southwestern China: Evidence of wildfire outside the Central Atlantic Magmatic Province
	Song Y.; Algeo T.J.; Wu W.; Luo G.; Li L.; Wang Y.; Xie S.
发表日期	2020
ISSN	00128252
卷号	201
英文摘要	Emplacement of the Central Atlantic Magmatic Province (CAMP) during the Triassic-Jurassic (Tr-J) transition is believed to have indirectly increased wildfire frequency through climatic warming and drying. To date, evidence for wildfires has come mainly from within the CAMP region. Here, we present biomarker evidence for wildfires in the form of polycyclic aromatic hydrocarbons (PAHs) in two terrestrial Triassic-Jurassic boundary sections in the Sichuan Basin, southwestern China. Pyrolytic PAHs of probable wildfire origin identified in these sections include pyrene, benzofluoranthene, benzo[e]pyrene, indeno[1,2,3-cd]pyrene, benzo[ghi]perylene, and coronene. Sharp increases in the abundances of pyrolytic PAHs normalized to total organic carbon were found during the Rhaetian Stage (R1 and R2) and at the Tr-J boundary. The ratios of pyrolytic PAHs (PPAHs) to methylated homologues document the combustion origin of PPAHs from methylated PAHs during these intervals of increased wildfire frequency. The abundances of oxygenated PAHs with furan structure show the same stratigraphic trend, testifying to enhanced soil erosion or weathering that may have resulted from a reduction of vegetative cover. Although CAMP-induced climate changes probably set the stage for more frequent wildfires in South China, the immediate trigger was probably a southward shift of the paleo-Intertropical Convergence Zone (ITCZ). These observations suggest a complex feedback involving climatic warming, precipitation and evapo-transpiration, vegetation density, and wildfire prevalence during the Tr-J transition. © 2019 Elsevier B.V.
关键词	Aridification Coronene Furans Polycyclic aromatic hydrocarbons Pyrene TJB
英文关键词	aridification; biomarker; furan; Jurassic; PAH; pyrene; spatial distribution; Triassic; wildfire; China; Sichuan 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/203890
作者单位	School of Earth Sciences, State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, United States; Exploration and Development of Geology and Mineral Resources Co, Ltd. of Jiangxi Province, 938 Ying Bin North Road, Nanchang, Jiangxi 330030, China; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China
推荐引用方式 GB/T 7714	Song Y.,Algeo T.J.,Wu W.,et al. Distribution of pyrolytic PAHs across the Triassic-Jurassic boundary in the Sichuan Basin, southwestern China: Evidence of wildfire outside the Central Atlantic Magmatic Province[J],2020,201.
APA	Song Y..,Algeo T.J..,Wu W..,Luo G..,Li L..,...&Xie S..(2020).Distribution of pyrolytic PAHs across the Triassic-Jurassic boundary in the Sichuan Basin, southwestern China: Evidence of wildfire outside the Central Atlantic Magmatic Province.Earth Science Reviews,201.
MLA	Song Y.,et al."Distribution of pyrolytic PAHs across the Triassic-Jurassic boundary in the Sichuan Basin, southwestern China: Evidence of wildfire outside the Central Atlantic Magmatic Province".Earth Science Reviews 201(2020).