Carbon isotopes, ammonites and earthquakes: Key Triassic-Jurassic boundary events in the coastal sections of south-east County Antrim, Northern Ireland, UK

Jeram, Andrew J.; Simms, Michael J.; Hesselbo, Stephen P.; Raine, Robert J.

doi:10.1016/j.pgeola.2021.10.004

Cited by 6 publications

(2 citation statements)

References 93 publications

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“…Data shown in this figure are tabulated in Supplementary Data Files 4-6 together with additional elements determined by p-XRF. and in the area of the UK and Ireland it may have been deposited in a carbonate ramp to offshore shelf setting (Hesselbo et al, 2004;Jeram et al, 2021). The age assignment for both members at Prees is the latest Rhaetian (see Sect.…”

Section: Penarth Group Lilstock Formationmentioning

confidence: 97%

“…Recently, Jeram et al (2021) reviewed correlations of UK basal Jurassic successions with reference to a newly published high-resolution carbon-isotope record from Larne, Northern Ireland; these authors discuss three possible correlations based on carbon-isotope stratigraphy. Here we follow the practice of several recent authors (Korte et al, 2019;Ruhl et al, 2020) who identify a secondary negative carbonisotope excursion lying between the "initial" and "main" carbon-isotope excursions of Hesselbo et al (2002).…”

Section: Ammonite Chronostratigraphy and Carbon-isotope Stratigraphymentioning

confidence: 99%

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Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic

Hesselbo,

Al-Suwaidi,

Baker

et al. 2023

Sci. Dril.

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Abstract. Drilling for the International Continental Scientific Drilling Program (ICDP) Early Jurassic Earth System and Timescale project (JET) was undertaken between October 2020 and January 2021. The drill site is situated in a small-scale synformal basin of the latest Triassic to Early Jurassic age that formed above the major Permian–Triassic half-graben system of the Cheshire Basin. The borehole is located to recover an expanded and complete succession to complement the legacy core from the Llanbedr (Mochras Farm) borehole drilled through 1967–1969 on the edge of the Cardigan Bay Basin, North Wales. The overall aim of the project is to construct an astronomically calibrated integrated timescale for the Early Jurassic and to provide insights into the operation of the Early Jurassic Earth system. Core of Quaternary age cover and Early Jurassic mudstone was obtained from two shallow partially cored geotechnical holes (Prees 2A to 32.2 m below surface (m b.s.) and Prees 2B to 37.0 m b.s.) together with Early Jurassic and Late Triassic mudstone from the principal hole, Prees 2C, which was cored from 32.92 to 651.32 m (corrected core depth scale). Core recovery was 99.7 % for Prees 2C. The ages of the recovered stratigraphy range from the Late Triassic (probably Rhaetian) to the Early Jurassic, Early Pliensbachian (Ibex Ammonoid Chronozone). All ammonoid chronozones have been identified for the drilled Early Jurassic strata. The full lithological succession comprises the Branscombe Mudstone and Blue Anchor formations of the Mercia Mudstone Group, the Westbury and Lilstock formations of the Penarth Group, and the Redcar Mudstone Formation of the Lias Group. A distinct interval of siltstone is recognized within the Late Sinemurian of the Redcar Mudstone Formation, and the name “Prees Siltstone Member” is proposed. Depositional environments range from playa lake in the Late Triassic to distal offshore marine in the Early Jurassic. Initial datasets compiled from the core include radiography, natural gamma ray, density, magnetic susceptibility, and X-ray fluorescence (XRF). A full suite of downhole logs was also run. Intervals of organic carbon enrichment occur in the Rhaetian (Late Triassic) Westbury Formation and in the earliest Hettangian and earliest Pliensbachian strata of the Redcar Mudstone Formation, where up to 4 % total organic carbon (TOC) is recorded. Other parts of the succession are generally organic-lean, containing less than 1 % TOC. Carbon-isotope values from bulk organic matter have also been determined, initially at a resolution of ∼ 1 m, and these provide the basis for detailed correlation between the Prees 2 succession and adjacent boreholes and Global Stratotype Section and Point (GSSP) outcrops. Multiple complementary studies are currently underway and preliminary results promise an astronomically calibrated biostratigraphy, magnetostratigraphy, and chemostratigraphy for the combined Prees and Mochras successions as well as insights into the dynamics of background processes and major palaeo-environmental changes.

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Section: Penarth Group Lilstock Formationmentioning

confidence: 97%

Section: Ammonite Chronostratigraphy and Carbon-isotope Stratigraphymentioning

confidence: 99%

Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic

Hesselbo,

Al-Suwaidi,

Baker

et al. 2023

Sci. Dril.

Self Cite

View full text Add to dashboard Cite

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Extensive marine anoxia in the European epicontinental sea during the end-Triassic mass extinction

Wignall

Newton

et al. 2022

Global and Planetary Change

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Marine redox change and extinction in Triassic–Jurassic boundary strata from the Larne Basin, Northern Ireland

Bond

Dickson

Ruhl

et al. 2022

Palaeogeography, Palaeoclimatology, Palaeoecology

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Carbon isotopes, ammonites and earthquakes: Key Triassic-Jurassic boundary events in the coastal sections of south-east County Antrim, Northern Ireland, UK

Cited by 6 publications

References 93 publications

Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic

Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic

Extensive marine anoxia in the European epicontinental sea during the end-Triassic mass extinction

Marine redox change and extinction in Triassic–Jurassic boundary strata from the Larne Basin, Northern Ireland

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