气候变化领域集成服务门户(CCPortal): Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record

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DOI	10.1016/j.earscirev.2019.102932
	Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record
	Fantasia A.; Adatte T.; Spangenberg J.E.; Font E.; Duarte L.V.; Föllmi K.B.
发表日期	2019
ISSN	00128252
卷号	198
英文摘要	The Toarcian Oceanic Anoxic Event (T-OAE, ~ 183 Ma) was an episode of extreme warmth, environmental changes and carbon cycle perturbation. We present a high-resolution study of the Peniche section (Lusitanian Basin, Portugal), recently defined as the Toarcian Global Stratotype Section and Point, to provide a review of the Pliensbachian–Toarcian (Pl–To) environmental and climatic changes. A large ~7‰-negative carbon-isotope excursion (CIE) is recorded within the T-OAE interval in bulk organic matter. Distinct small-scale δ13C negative shifts, modulating the T-OAE carbon isotope signal, are correlated across different European basins, which have implications on the estimation of the T-OAE duration. The increase in kaolinite content and chemical index of alteration from the Pl–To boundary up to the T-OAE interval is interpreted as reflecting a shift towards warmer and wetter climate conditions. The common occurrence of coarse-grained turbidites within the T-OAE interval is possibly linked with changes of the hydrological cycle and storm intensity. Low total organic carbon contents together with the absence of redox-sensitive trace element enrichments indicate oxygen-deficient conditions unfavourable for organic matter preservation. Mercury data show a clear increase at the base of the T-OAE CIE followed by a return to background values, providing further evidence that Karoo-Ferrar volcanism might have triggered the series of environmental disturbances during the early Toarcian. However, the highest mercury values are recorded in samples containing abundant pyritized wood fragments, highlighting the influence of local chemical processes on mercury enrichments, which should be considered before any interpretation of the Hg records. © 2019 Elsevier B.V.
关键词	Geochemistry Hemipelagic environment Mineralogy Portugal Toarcian Oceanic Anoxic Event
英文关键词	anoxic conditions; carbon isotope; climate variation; mineralogy; paleoceanography; paleoclimate; paleoenvironment; Pliensbachian; stratotype; Toarcian; Atlantic Ocean; Lisboa [Portugal]; Lusitanian Basin; Peniche Basin; Portugal
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/203421
作者单位	ISTE, Institute of Earth Sciences, University of Lausanne, Lausanne, 1015, Switzerland; Department for Gesocience, University of Aarhus, Aarhus C, 8000, Denmark; IDYST, Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, 1015, Switzerland; FCTUC, Department of Earth Sciences, University of Coimbra, Portugal; IDL-FCUL, Institute Dom Luís, Faculty of Sciences, University of Lisbon, Portugal; MARE – Marine and Environmental Sciences Centre, Portugal
推荐引用方式 GB/T 7714	Fantasia A.,Adatte T.,Spangenberg J.E.,等. Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record[J],2019,198.
APA	Fantasia A.,Adatte T.,Spangenberg J.E.,Font E.,Duarte L.V.,&Föllmi K.B..(2019).Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record.Earth Science Reviews,198.
MLA	Fantasia A.,et al."Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record".Earth Science Reviews 198(2019).