Abundance and size changes in the calcareous nannofossil Schizosphaerella – Relation to sea-level, the carbonate factory and palaeoenvironmental change from the Sinemurian to earliest Toarcian of the Paris Basin

Peti, Leonie; Thibault, Nicolas

doi:10.1016/j.palaeo.2017.06.019

Cited by 35 publications

(18 citation statements)

References 26 publications

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“…Therefore, the changes recorded at Dorset do probably not only reflect carbon cycle perturbations but also this geographically deeply changing world. Within the Pliensbachian short-lived climate snaps were not only recorded in the British realm but were also reported by Silva and Duarte (2015) and Peti and Thibault (2017).…”

Section: Climate Humidity and Anoxiamentioning

confidence: 65%

Climate and environmental response to the break-up of Pangea during the Early Jurassic (Hettangian-Pliensbachian); the Dorset coast (UK) revisited

Schöllhorn

Adatte

Schootbrugge

et al. 2020

Global and Planetary Change

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Section: Climate Humidity and Anoxiamentioning

confidence: 65%

Climate and environmental response to the break-up of Pangea during the Early Jurassic (Hettangian-Pliensbachian); the Dorset coast (UK) revisited

Schöllhorn

Adatte

Schootbrugge

et al. 2020

Global and Planetary Change

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“…On the other hand, it is difficult to disentangle the effects of ocean acidification on test size from other environmental stresses. Variations in the size of Schizosphaerella tests have, for example, also been correlated to warming and cooling trends (Peti & Thibault, 2017). Full‐blown acidification (i.e.…”

Section: Discussionmentioning

confidence: 99%

Ocean acidification and photic‐zone anoxia at the Toarcian Oceanic Anoxic Event: Insights from the Adriatic Carbonate Platform

et al. 2020

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Severe global climate change led to the deterioration of environmental conditions in the oceans during the Toarcian Stage of the Jurassic. Carbonate platforms of the Western Tethys Ocean exposed in Alpine Tethyan mountain ranges today offer insight into this period of environmental upheaval. In addition to informing understanding of climate change in deep time, the effect of ancient carbon cycle perturbations on carbonate platforms has important implications for anthropogenic climate change; the patterns of early Toarcian environmental deterioration are similar to those occurring in modern oceans. This study focuses on the record of the early Toarcian Oceanic Anoxic Event (ca 183.1 Ma) in outcrops of the northwest Adriatic Carbonate Platform in Slovenia. Amidst environmental deterioration, the northwest Adriatic Platform abruptly transitioned from a healthy, shallow-water environment with diverse metazoan ecosystems to a partially drowned setting with low diversity biota and diminished sedimentation. An organic carbon-isotope excursion of −2.2‰ reflects the massive injection of CO 2 into the ocean-atmosphere system and marks the stratigraphic position of the Toarcian Oceanic Anoxic Event. A prominent dissolution horizon and suppressed carbonate deposition on the platform are interpreted to reflect transient shoaling of the carbonate compensation depth to unprecedentedly shallow levels as the dramatic influx of CO 2 overwhelmed the ocean's buffering capacity, causing ocean acidification. Trace metal geochemistry and palaeoecology highlight water column deoxygenation, including the development of photic-zone anoxia, preceding and during the Toarcian Oceanic Anoxic Event. Ocean acidification and reduced oxygen levels likely had a profoundly negative effect on carbonate-producing biota and growth of the Adriatic Platform. These effects are consistent with the approximate doubling of the concentration of CO 2 in the ocean-atmosphere system from pre-event levels, which has previously been linked to a volcanic triggering mechanism. Mercury enrichments discovered in this study support a temporal and genetic link between volcanism, the Toarcian Oceanic Anoxic Event and the carbonate crisis.

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“…As for Luehndea spinosa, changes in seawater temperature appeared to have caused significant alterations in other planktonic groups. For example, Peti and Thibault (2017) documented small average sizes of Schizosphaerella during the T-OAE interval in the Paris Basin. These data suggest that the Schizosphaerella size fluctuations are correlated with climatic change, and the smaller average size is a response to the warmer conditions.…”

Section: The Palaeobiology Of Plankton Phase 4 (Samples P15 To P38)mentioning

confidence: 99%

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

Correia

Riding

Duarte

et al. 2017

Marine Micropaleontology

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The uppermost Pliensbachian and lower Toarcian (Lower Jurassic) succession exposed at Peniche in the central part of the Lusitanian Basin, western Portugal, was examined for palynomorphs. The 45 samples span the Emaciaticeras emaciatum, Dactylioceras polymorphum and Hildaites levisoni ammonite biozones (ABs), and the succession includes the Global Stratotype Section and Point (GSSP) for the Toarcian Stage and the Toarcian Oceanic Anoxic Event (T-OAE). A low diversity dinoflagellate cyst flora, typical of the Sub-Boreal Realm, was recovered from the Emaciaticeras emaciatum and Dactylioceras polymorphum ABs. The dominant element is the cold water species Luehndea spinosa, which is an index for the Pliensbachian to earliest Toarcian, and is thought to have migrated from the more northerly Boreal Realm. Prior to the T-OAE, dinoflagellates thrived in the Lusitanian Basin, except during a brief warm period in the earliest Toarcian. Despite the latter, the recovery from this event was relatively rapid 2 and was characterised by a return to relatively cool temperatures. The Hildaites levisoni AB at Peniche represents the T-OAE and the overlying strata, and is characterised by a profound reduction in dinoflagellate cyst relative abundances. This dinoflagellate cyst 'blackout', and the associated rise of prasinophytes, reflects significant environmental stress, such as marine anoxia, elevated temperatures and reduced salinity, with the former two probably being most important. The low proportions of dinoflagellate cysts following the T-OAE indicates a protracted recovery phase from the bottom and water column anoxia developed throughout the Lusitanian Basin.

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Abundance and size changes in the calcareous nannofossil Schizosphaerella – Relation to sea-level, the carbonate factory and palaeoenvironmental change from the Sinemurian to earliest Toarcian of the Paris Basin

Cited by 35 publications

References 26 publications

Climate and environmental response to the break-up of Pangea during the Early Jurassic (Hettangian-Pliensbachian); the Dorset coast (UK) revisited

Climate and environmental response to the break-up of Pangea during the Early Jurassic (Hettangian-Pliensbachian); the Dorset coast (UK) revisited

Ocean acidification and photic‐zone anoxia at the Toarcian Oceanic Anoxic Event: Insights from the Adriatic Carbonate Platform

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

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