The palynological response to the Toarcian Oceanic Anoxic Event (Early Jurassic) at Peniche, Lusitanian Basin, western Portugal

Correia, Vânia F.; Riding, James B.; Duarte, Luís V.; Fernandes, Paulo; Pereira, Zélia

doi:10.1016/j.marmicro.2017.10.004

Cited by 37 publications

(25 citation statements)

References 87 publications

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“…Andreu et al 1995) which lack bottom water biota and bioturbation and preserved fossils are of planktonic and nektonic organisms. At Peniche, despite the strong pertubation of the benthic, nektonic and planktonic records in this interval (Mattioli et al 2009;Cabral et al 2011Cabral et al , 2013Comas-Rengifo et al 2015;Rita et al 2016;Correia et al 2017), the low total organic carbon content and the absence of redox-sensitive traces confirm absence of anoxia (e.g. Hesselbo et al 2007, Fantasia et al 2019.…”

Section: Ostracod Palaeobiogeography and The Carbon Isotope Excursionmentioning

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%

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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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Section: Ostracod Palaeobiogeography and The Carbon Isotope Excursionmentioning

confidence: 96%

Section: A B Cmentioning

confidence: 99%

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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“…These authors only recovered three dinoflagellate cysts (Barrón and Azerêdo 2003, p. 285). Other substantial contributions on the Jurassic palynology of Portugal include Mohr and Schmidt (1988), Bucefalo Palliani and , Oliveira et al (2007), Borges et al (2011Borges et al ( , 2012, Barrón et al (2013), Rocha et al (2016), Correia et al (2017aCorreia et al ( , 2017bCorreia et al ( , 2018 and Turner et al (2017).…”

Section: Introductionmentioning

confidence: 99%

“…Correia et al (2017b) established that cyst-forming dinoflagellates were very slow to recover from the severe environmental pressures (principally anoxia, high temperatures andlowered salinities) caused by the Toarcian Oceanic Anoxic Event (T-OAE). It seems probable that the enclosed setting of the Lusitanian Basin intensified and prolonged the anoxia which developed in the water column at this time.…”

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confidence: 99%

The Middle Jurassic palynostratigraphy of the northern Lusitanian Basin, Portugal

Correia¹,

Riding²,

Henriques³

et al. 2019

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A composite largely Middle Jurassic succession spanning the Toarcian-Aalenian transition to the lowermost Bathonian exposed at Cabo Mondego and São Gião in the northern Lusitanian Basin, western Portugal, was examined palynologically. The 129 samples are correlated to ammonite biozones (ABs) spanning Pleydellia aalensis to Zigzagiceras zigzag. The Cabo Mondego succession comprises the type section of the Cabo Mondego Formation and spans virtually the entire interval studied. This is a significant interval because it includes the Global Stratotype Section and Point (GSSP) and the Auxiliary Stratigraphical Section and Point (ASSP) for the Bajocian and Bathonian stages respectively. The Cabo Mondego Formation largely yielded relatively abundant palynomorph associations in the 68 2 productive samples recovered. By contrast, the Póvoa da Lomba Formation at São Gião only includes the Toarcian-Aalenian transition; the 21 productive horizons produced sparse assemblages. The uppermost Toarcian to lowermost Bajocian is characterised by a low diversity dinoflagellate cyst association, typified by Nannoceratopsis. Above this is a markedly more diverse assemblage, dominated by the family Gonyaulaceae. This influx, in the Witchellia laeviuscula AB, represents a global evolutionary radiation which may be linked to sea level rise. The lower Bajocian yielded significant proportions of gonyaulacacean forms with epicystal and multiplate precingular archaeopyles, representing morphological experimentation as part of this radiation. The trend of increasing dinoflagellate cyst diversity continued at the Bajocian-Bathonian transition, particularly sexiform tabulate gonyaulacaceans with single plate precingular archaeopyles. The Middle Jurassic dinoflagellate cyst associations of the Lusitanian Basin are significantly less diverse than coeval palynobiotas from eastern and northern Europe, and the Arctic. The Toarcian Oceanic Anoxic Event (T-OAE) profoundly inhibited cyst-forming dinoflagellates in this depocentre, and the recovery was protracted. Hence the T-OAE may have suppressed dinoflagellate cyst diversity well into the Middle Jurassic. This phenomenon may have been exacerbated by the absence of typically Arctic taxa through latitudinal controls and/or global cooling during the early Aalenian. These low levels of dinoflagellate cyst species richness may also be related to the palaeogeography of the Lusitanian Basin. This relatively isolated deepwater depocentre close to the Proto Atlantic, may have precluded extensive biotal exchange with the widespread shelfal areas of the western Tethys. The absence of Dissiliodinium giganteum in the Lusitanian Basin is consistent with this scenario. The pollen and spores observed in this study are typical of Middle Jurassic assemblages worldwide. Araucarian pollen, largely Callialasporites, diversified and became prominent during the Aalenian.

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“…The T-OAE is characterized by common black shale deposits that refl ect the widespread development of poor oxygenation in the oceans, warming in tropical and subtropical seas (~5-8°C; Gómez et al, 2008), biotic turnovers and negative carbon isotope excursions (CIE) (e.g., Jenkyns, 1988;Hesselbo et al, 2007;Suan et al, 2008Suan et al, , 2011Littler et al, 2010;Izumi et al, 2012). This event had a signifi cant impact on the marine biota, including benthic and pelagic groups (Hallam, 1996;Wignall et al, 2005;Comas-Rengifo et al, 2013;Rita et al, 2016;Baeza-Carratalá et al, 2017;Correia et al, 2017b). The negative CIEs suggest an input of 13 C-depleted carbon into the atmosphere-ocean system.…”

Section: Introductionmentioning

confidence: 99%

Ichnological analysis at the Fonte Coberta section (Lusitanian Basin, Portugal): Approaching depositional environment during the Toarcian oceanic anoxic event (T-OAE)

Miguez‐Salas

Rodrı́guez-Tovar

Duarte

2018

Spanish J. Palaeontol.

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The Toarcian Oceanic Anoxic Event (T-OAE) is commonly related with an extended marine mass extinction and global oceanic anoxic conditions. However, recently it has been demonstrated that local palaeotopography/palaeogeography can determinate the absence of anoxic conditions, being other limiting environmental parameters of higher signifi cance. The detailed study of the Fonte Coberta section (Lusitanian Basin, Portugal) shows significant changes in the macrobenthic community at the lower Toarcian (Levisoni Zone) sediments during the event. In the study section, this interval presents a high degree of bioturbation with a relatively abundant and moderately diverse trace fossil assemblage dominated by Thalassinoides, with punctual Spongeliomorpha. The ichnotaxonomical study conducted on this trace fossil assemblage has allowed the recognition of a single species of Thalassinoides, T. suevicus Rieth, with two different morphotypes (I and II), as well the differentiation of Spongeliomorpha aff . iberica Saporta. The distribution of these ichnospecies, including the differentiated morphogroups, along the studied interval, corresponding to the T-OAE, allows refining depositional conditions as changes in the substrate consistency related to variations in relative sea level. Ichnological analysis reveals as a proxy to improve sequence stratigraphy characterization for the Lusitanian Basin during the T-OAE.

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The palynological response to the Toarcian Oceanic Anoxic Event (Early Jurassic) at Peniche, Lusitanian Basin, western Portugal

Cited by 37 publications

References 87 publications

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

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

The Middle Jurassic palynostratigraphy of the northern Lusitanian Basin, Portugal

Ichnological analysis at the Fonte Coberta section (Lusitanian Basin, Portugal): Approaching depositional environment during the Toarcian oceanic anoxic event (T-OAE)

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