Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record

Fantasia, Alicia; Adatte, Thierry; Spangenberg, Jorge E.; Font, Eric; Duarte, Luís V.; Föllmi, Karl B.

doi:10.1016/j.earscirev.2019.102932

Cited by 73 publications

(63 citation statements)

References 104 publications

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“…This conclusion is supported by the common observation of parallel stratigraphic trends in δ 13 C wood values and δ 13 C of bulk marine organic matter (e.g. example of Toarcian of Lusitanian Basin (Hesselbo et al 2007, Fantasia et al 2019. It should be also noted that only the Coniferales and Ginkgophyta produced significant amounts of secondary xylem and most of our wood likely came from conifer trees (Morgans 1999;Philippe et al 2006;Pieokowski et al 2016).…”

Section: Variables Influencing δ 13 C Wood and Toc Cont -Discussionsupporting

confidence: 80%

“…Similarly, Price et al (2016) compared δ 13 C and δ 18 O for the Sinemurian and Pliensbachian section in Dorset and there is a generally good convergence for most of the section, but in some parts of the profile one can observe some divergences as well. There is good convergence of δ 13 C and δ 18 O both in the Rhaetian-Hettangian sections in SW UK (Korte et al 2009) and in the uppermost Pliensbachian -lower Toarcian section in the Peniche GSSP profile in Portugal (Suan et al 2008;Fantasia et al 2019). Nevertheless, existing δ 13 C and δ 18 O divergences tend to cast some doubts, at least on universality of δ 13 C org and δ 18 O/temperature relations because one should expect even stronger relationship between these parameters in marine sediments than there is between δ 13 C wood and marine temperature, as the J o u r n a l P r e -p r o o f relationship is more direct.…”

Section: Variables Influencing δ 13 C Wood and Toc Cont -Discussionmentioning

confidence: 86%

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Interdisciplinary Approaches to the Scandinavian Heritage of North-West England

Griffiths¹

In Search of Vikings

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Section: Variables Influencing δ 13 C Wood and Toc Cont -Discussionsupporting

confidence: 80%

Section: Variables Influencing δ 13 C Wood and Toc Cont -Discussionmentioning

confidence: 86%

Interdisciplinary Approaches to the Scandinavian Heritage of North-West England

Griffiths¹

In Search of Vikings

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“…The sharpest change is recorded in the ostracod group, with extinction of the Metacopina (Cabral et al 2011(Cabral et al , 2013Rocha et al 2016). The Lower Toarcian of Peniche shows two important negative carbon isotope events which can be globally correlated (Hesselbo et al 2007, Littler et al 2010, Fantasia et al 2019 (Fig. 2).…”

Section: A B Cmentioning

confidence: 96%

“…At Peniche, this interval records the Toarcian GSSP and the T-OAE, reflected in both carbon and oxygen stable isotope negative excursions and important changes in the biotic record, such as for calcareous nannofossils, dinoflagellates, foraminifers, ostracods and brachiopods (e.g. Hesselbo et al 2007;Suan et al 2008Suan et al , 2010Mattioli et al 2009;Cabral et al 2011Cabral et al , 2013Comas-Rengifo et al 2015;Rita et al 2016;Rocha et al 2016;Correia et al 2017;Duarte et al 2017;Fantasia et al 2019). The sharpest change is recorded in the ostracod group, with extinction of the Metacopina (Cabral et al 2011(Cabral et al , 2013Rocha et al 2016).…”

Section: A B Cmentioning

confidence: 99%

“…The Pliensbachian-Toarcian transition marks a 2 nd order regressive-transgressive discontinuity over the LB (Duarte 2007, where the onset of the CIE corresponds to clear basin wide facies changes (e.g. Duarte 1997, Duarte et al 2004, Pittet et al 2014, Rodríguez-Tovar et al 2017, Fantasia et al 2019. At Peniche, these changes include the occurrence of siliciclastic deposits showing turbidite features (Wright & Wilson 1984, Duarte 1997, within an otherwise regular marl-limestone succession, increasingly more limestone dominated upwards.…”

Section: A B Cmentioning

confidence: 99%

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Ostracods of the Toarcian (Jurassic) of Peniche, Portugal: taxonomy and evolution across and beyond the GSSP interval

Cabral¹,

Lord²,

Pinto³

et al. 2020

Bull. Geosci.

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With the formal recognition of the Global Boundary Stratotype Section and Point (GSSP) for the base of the Toarcian Stage at Peniche, western Portugal (Rocha et al. 2016), all stages of the Early Jurassic are now defined thus providing the essential stratigraphic framework for developing understanding of global environmental conditions and biota for that period of time (201.4-174.2 Ma, Ogg et al. 2016). The Toarcian stage represents a very special phase of Earth history when, to cite Xu et al. (2018, pp. 396-397): "The Toarcian stage (~183-174 Ma) is considered to be the warmest interval of the Jurassic period encompassing a transient temperature rise of up to ~7 °C in mid-latitudes (Dera et al. 2011, Gradstein et al. 2012, Korte et al. 2015). The stage is also marked by one of the most intense and geographically widespread developments of anoxic/euxinic oceanic conditions of the Mesozoic era (Jenkyns 2010). This phenomenon of extreme redox changes is therefore termed the Toarcian Oceanic Anoxic Event (T-OAE, at ~183 Ma) and is marked by large-scale organic-carbon burial in shelf-sea settings, deeper marine basins, and lakes (Jenkyns 1985, 1988; Xu et al. 2017). The T-OAE was characterized by a severe perturbation to the global carbon cycle…". We give this quotation at length because it is an efficient introduction to Toarcian times, which are currently the subject of a large and rapidly growing literature which it is not our purpose to summarize here. Current work links the growth of a late Pliensbachian cryosphere and its decline in the early Toarcian with climate change and sea level fluctuations, broadly Pliensbachian regression and early Toarcian transgression, and freshwater input into the oceans with greenhouse gases released into the atmosphere and reflected in the carbon isotope record (Ruebsam at al. 2019). This phase of the Earth history also records a widely documented mass extinction (e.g.

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Sedimentary Mercury Enrichments as a Tracer of Large Igneous Province Volcanism

Percival

Bergquist

Mather

et al. 2021

Geophysical Monograph Series

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Volcanic activity associated with the emplacement of Large Igneous Provinces (LIPs) has been linked to most Phanerozoic extinctions/episodes of major environmental change. In recent years, mercury (Hg) enrichments and elevated mercury/total organic carbon (Hg/TOC) ratios have been increasingly utilized as a marker of volcanism in sedimentary records deposited distally from LIPs. The proxy is based on the premise that volcanism is a major natural source of the element to the atmosphere, and was especially important prior to anthropogenic emissions. To date, end-Permian and end-Triassic records illustrate the strongest use of Hg as a volcanic proxy; aided by supporting evidence (including Hg isotopes) for LIP eruptions and/or volatile emissions. Sedimentary records of several other events also document Hg enrichments in at least one region, suggesting regional or global Hg-cycle perturbations potentially linked to volcanism at those times. The Cenomanian-Turonian Oceanic Anoxic Event appears to be an exception, with Hg/TOC peaks documented in a small minority of studied records, suggesting minimal Hg-cycle disturbance at that time. Even for events that apparently featured a global-scale Hg-cycle perturbation, variable Hg enrichments across individual archives of that same crisis indicate that the complex biogeochemical cycling of the element can strongly influence local/regional aquatic, biological, or sedimentary processes to alter the precise signature of any worldwide disturbance. Recent studies are beginning to investigate these complexities, but further work is needed to fully explore the nuances of Hg in the geological record, and how it can be best employed as a proxy for LIP volcanism.

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Global versus local processes during the Pliensbachian–Toarcian transition at the Peniche GSSP, Portugal: A multi-proxy record

Cited by 73 publications

References 104 publications

Interdisciplinary Approaches to the Scandinavian Heritage of North-West England

Interdisciplinary Approaches to the Scandinavian Heritage of North-West England

Ostracods of the Toarcian (Jurassic) of Peniche, Portugal: taxonomy and evolution across and beyond the GSSP interval

Sedimentary Mercury Enrichments as a Tracer of Large Igneous Province Volcanism

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