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

Schöllhorn, Iris; Adatte, Thierry; Schootbrugge, Bas van de; Houben, Alexander J. P.; Charbonnier, Guillaume; Janssen, Nico M.M.; Föllmi, Karl B.

doi:10.1016/j.gloplacha.2019.103096

Cited by 28 publications

(40 citation statements)

References 161 publications

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“…The O isotope ratios of Hettangian samples of −6 to −2‰ in the Mochras bulk carbonate are broadly similar, but less negative than ratios in samples from the Somerset coast (−7 to 3‰, Clémence et al 2010) and the Dorset coast (−6 to 4‰, Schöllhorn et al 2020). All three sequences share a tendency of lower δ 18 O in the lower Hettangian, which has been ascribed to freshening and/or warming (Schöllhorn et al 2020). However, it is unclear to what degree this signal could be preserved in bulk rock sequences given the strong deviation from macrofossil values (Hesselbo et al 2020c).…”

Section: Diagenetic History Of the Mochras Corementioning

confidence: 78%

“…However, it is unclear to what degree this signal could be preserved in bulk rock sequences given the strong deviation from macrofossil values (Hesselbo et al 2020c). The O isotope ratios in the Sinemurian and Pliensbachian of the Wessex Basin are more variable and initially more negative than at Mochras (Schöllhorn et al 2020), suggesting lower temperatures and/or less influence of freshwater during diagenetic stabilization of the rock in the Cardigan Bay Basin. The δ 13 C carb values in the Wessex Basin are typically c. 2‰ lower than in the Cardigan Bay Basin in Hettangian and Sinemurian strata and are scattered where the carbonate content is <10%, even though a broad correspondence of isotopic excursions in organic matter and carbonate is observed (Schöllhorn et al 2020).…”

Section: Diagenetic History Of the Mochras Corementioning

confidence: 99%

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Geochemistry of macrofossil, bulk rock and secondary calcite in the Early Jurassic strata of the Llanbedr (Mochras Farm) drill core, Cardigan Bay Basin, Wales, UK

Ullmann

Szűcs

Jiang

et al. 2021

JGS

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The Llanbedr (Mochras Farm) core (Wales, United Kingdom) yielded a > 1,300 m long mudrock sequence which has excellent potential for establishing an integrated stratigraphic scheme for the entire Early Jurassic Epoch. Lithological variations in the core are predominantly driven by hierarchical changes in carbonate content which also dominate – or may impact upon – many geochemical and physical properties of the core. The bulk carbonate carbon isotope record displays systematic fluctuations the largest of which correspond to previously identified phases of environmental perturbation. The magnitudes of negative carbon isotope excursions in carbonate are inflated compared to equivalents previously described elsewhere due to diagenesis and concomitant loss of primary carbonate.The marine macrofossil record of Mochras reveals biological and isotopic patterns that are generally comparable to other UK basins. Potentially significant differences between Cleveland and Cardigan Bay Basin are observed in the Pliensbachian and Toarcian fossils. This different expression may be related to different habitat structure or palaeoceanographic and water depth differences between these basins. Minima in macrofossil δ18O values generally coincide with peaks in macrofossil wood abundance and sea-level lowstands inferred from sequence stratigraphic interpretation of other UK sections. This relationship points to a possible relative sea-level control on observed oxygen isotope records and sediment provenance.Supplementary material: Analytical data for the Mochras core pertaining to this contribution is available online at https://doi.org/10.6084/m9.figshare.c.5463508

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Section: Diagenetic History Of the Mochras Corementioning

confidence: 78%

Section: Diagenetic History Of the Mochras Corementioning

confidence: 99%

Geochemistry of macrofossil, bulk rock and secondary calcite in the Early Jurassic strata of the Llanbedr (Mochras Farm) drill core, Cardigan Bay Basin, Wales, UK

Ullmann

Szűcs

Jiang

et al. 2021

JGS

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“…However, Schöllhorn et al (2020) show good convergence between these two variables in Sinemurian of Dorset (UK), while there are divergences in the lower Pliensbachian. Of note is also the fact that Hesselbo et al (2020a,b) point to divergence in the lower Sinemurian, while the Hettangian part shows rather good convergence between the two variables.…”

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

confidence: 96%

“…However, there are some inherent uncertainties regarding δ 13 C and δ 18 O results from marine deposits and their interpretation. It is now well established that bulk organic Cisotope records need to be regarded with caution due to the mixing effects of different types of carbon, each with their own δ 13 C signature (Van de Schootbrugge et al 2008;Suan et al 2015;Schöllhorn et al 2020). In Kaszewy these problems are avoided, because the δ 13 C wood values comes from homogenous material.…”

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

confidence: 99%

“…This widespread transgression is documented in Kaszewy by the appearance of marine kerogen and marine plankton(Pieokowski 2015;. Concerning δ 13 C correlations, sections of Yorkshire(Korte and Hesselbo 2011; Hesselbo et al 2020a) and Dorset(Schöllhorn et al 2020) confirm the characteristic pattern of CIE excursions, with the lowermost Pliensbachian negative CIE preceded by a sharp positive CIE excursion in the uppermost Sinemurian. Such a pattern occurs also in Kaszewy between Rhaetian strata, TOC is usually below 1%, except for some darker mudstones interpreted to have been deposited in local ponds and lakes, where TOC content can reach 4% and more.…”

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confidence: 91%

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Interdisciplinary Approaches to the Scandinavian Heritage of North-West England

Griffiths¹

In Search of Vikings

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Radiolarian response to environmental changes at the Sinemurian–Pliensbachian transition in the Northern Calcareous Alps, Austria

Cifer,

Goričan,

Demény

et al. 2024

Papers in Palaeontology

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Major environmental, climate and sealevel changes occurred in the Western Tethyan Realm during the late Sinemurian to early Pliensbachian time interval. Here, we examine how these changes affected the taxonomic composition of radiolarian fauna. Radiolarian assemblages were collected on Mount Rettenstein (Northern Calcareous Alps) from a siliceous limestone and marl succession, deposited in a well‐oxygenated basin a few hundred metres in depth on the continental shelf at the western edge of the Neotethys Ocean. Radiolarian research was complemented with elemental and isotope geochemistry on bulk carbonate samples. The siliceous microfaunas below and above the stage boundary consist of more than 80% sponge spicules and less than 20% radiolarians, with a strong predominance of the Order Spumellaria. The Nassellaria to Spumellaria abundance ratio ranges from 1:5 to 1:3. At the Sinemurian–Pliensbachian transition, a significant drop in diversity occurred, accompanied by a substantial change in relative abundances of radiolarian taxa. The most severely affected groups were surface‐dwelling radiolarians (Angulobrachiidae, Hagiastridae, Pantanelliidae; mostly Gorgansium, Poulpidae and Ultranaporidae), which almost or completely disappeared. In contrast, Archaeocenosphaera, Praeconocaryomma, Zhamoidellum and Lantus became abundant and were apparently the most resistant to environmental stress. The changes in radiolarian assemblages were local and probably induced by the end‐Sinemurian sealevel drop that transformed the area into a semi‐enclosed basin with restricted ocean circulation. The exchange of water masses and thus radiolarian faunas with the open sea was reduced and their productivity may have been lowered by the lower inflow of fertile waters from the ocean.

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

Cited by 28 publications

References 161 publications

Geochemistry of macrofossil, bulk rock and secondary calcite in the Early Jurassic strata of the Llanbedr (Mochras Farm) drill core, Cardigan Bay Basin, Wales, UK

Geochemistry of macrofossil, bulk rock and secondary calcite in the Early Jurassic strata of the Llanbedr (Mochras Farm) drill core, Cardigan Bay Basin, Wales, UK

Interdisciplinary Approaches to the Scandinavian Heritage of North-West England

Radiolarian response to environmental changes at the Sinemurian–Pliensbachian transition in the Northern Calcareous Alps, Austria

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