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A new subsurface record of the Pliensbachian-Toarcian, Lower Jurassic, of Yorkshire

Trabucho-Alexandre, J.P.; Gröcke, D.R.; Atar, E.; Herringshaw, L.; Jarvis, I.

A new subsurface record of the Pliensbachian-Toarcian, Lower Jurassic, of Yorkshire Thumbnail


Authors

J.P. Trabucho-Alexandre

E. Atar

L. Herringshaw

I. Jarvis



Abstract

Here, we describe the upper Pliensbachian to middle Toarcian stratigraphy of the Dove's Nest borehole, which was drilled near Whitby, North Yorkshire, in 2013. The core represents a single, continuous vertical section through unweathered, immature Lower Jurassic sedimentary rocks. The thickness of the Lias Group formations in the Dove's Nest core is approximately the same as that exposed along the North Yorkshire coast between Hawsker Bottoms and Whitby. The studied succession consists of epeiric-neritic sediments and comprises cross-laminated very fine sandstones, (oolitic) ironstones, and argillaceous mudstones. Dark argillaceous mudstone is the dominant lithology. These sediments were deposited in the Cleveland Basin, a more subsident area of an epeiric sea, the Laurasian Sea. We present a set of geochemical data that includes organic carbon isotope ratios (δ13Corg) and total organic carbon (TOC). The δ13Corg record contains a negative excursion across the Pliensbachian–Toarcian boundary and another in the lower Toarcian that corresponds to the Toarcian Oceanic Anoxic Event (T-OAE). Below the T-OAE negative excursion, δ13Corg values are less 13C-depleted than above it. We find no evidence of a long-term δ13Corg positive excursion. TOC values below the T-OAE negative excursion are lower than above it. Sedimentary evidence suggests that, during much of the Pliensbachian–Toarcian interval, the seafloor of the Cleveland Basin was above storm wave-base and that storm-driven bottom currents were responsible for much sediment erosion, transport, and redeposition during the interval of oceanic anoxia. The abrupt shifts observed in the δ13Corg record (lower Toarcian) are likely to reflect the impact of erosion by storms on the morphology of the δ13C record of the T-OAE.

Citation

Trabucho-Alexandre, J., Gröcke, D., Atar, E., Herringshaw, L., & Jarvis, I. (2022). A new subsurface record of the Pliensbachian-Toarcian, Lower Jurassic, of Yorkshire. Proceedings of the Yorkshire Geological Society, 64(2), https://doi.org/10.1144/pygs2022-007

Journal Article Type Article
Acceptance Date Aug 15, 2022
Online Publication Date Sep 29, 2022
Publication Date 2022-11
Deposit Date Aug 23, 2022
Publicly Available Date Mar 29, 2024
Journal Proceedings of the Yorkshire Geological Society
Print ISSN 0044-0604
Electronic ISSN 2041-4811
Publisher The Geological Society
Peer Reviewed Peer Reviewed
Volume 64
Issue 2
DOI https://doi.org/10.1144/pygs2022-007

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