The Jurassic Period

Hesselbo, Stephen P.; Ogg, James G.; Ruhl, Micha; Hinnov, Linda A.; Huang, Chunju

doi:10.1016/b978-0-12-824360-2.00026-7

Cited by 70 publications

(52 citation statements)

References 281 publications

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“…The Early Jurassic Pliensbachian–Toarcian (Pl–To; ~ 184.2 Ma 1 ) carbon-isotope excursion (CIE) is marked by a -3‰ shift in δ 13 C in both bulk-rock carbonate and organic carbon 2 , 3 . The stage boundary is associated in time with a second-order extinction event affecting ammonites, belemnites, gastropods, and many other benthic and pelagic groups, that effectively defines it 4 – 6 .…”

Section: Introductionmentioning

confidence: 99%

“…The Pl–To event has been studied in the Tethyan and northwest European realms 2 , 7 , 11 , as well as Canada, Chile, and Japan 8 , 12 – 14 . The age of the boundary is presently computed based on a combination of cyclostratigraphy and U–Pb geochronology and is estimated to be 184.2 Ma based on an age of 183.2 ± 0.1 Ma for the top of the tenuicostatum Zone 1 . Other U–Pb ages that help to constrain this boundary include dates from Argentina 15 , Peru 16 , 17 , the USA 18 and Canada 19 – 21 , although these lack tight biostratigraphic control, specifically with respect to correlation with the European ammonite zones.…”

Section: Introductionmentioning

confidence: 99%

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New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

Suwaidi

Ruhl

Jenkyns

et al. 2022

Sci Rep

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The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment are accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U–Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~ 183.73 + 0.35/− 0.50 Ma for the Pliensbachian–Toarcian boundary, and 182.77 + 0.11/− 0.15 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U–Pb zircon geochronology and a Bayesian Markov chain Monte Carlo (MCMC) stratigraphic age model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

Suwaidi

Ruhl

Jenkyns

et al. 2022

Sci Rep

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show abstract

“…The Pl-To event has been studied in the Tethyan and northwest European realms 1,6,10, as well as Canada, Chile, and Japan 7,11−13 . The age of the boundary is presently computed based on a combination of cyclostratigraphy and U-Pb geochronology and is estimated to be 184.2 Ma with an age of 183.2 ± 0.1 for the top of the tenuicostatum Zone 14 . Other U-Pb ages that help to constrain this boundary age include dates from Argentina 15,16 , the USA 17 and Canada [18][19][20] , although these lack strong biostratigraphic control, speci cally with respect to the European ammonite zones.…”

Section: Introductionmentioning

confidence: 99%

New Chronostratigraphic Constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

Suwaidi

Ruhl

Jenkyns

et al. 2021

Preprint

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The Pliensbachian–Toarcian boundary interval is characterized by a ~3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment is accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U-Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~183.71 ± 0.40/-0.51 Ma for the Pliensbachian–Toarcian boundary, and 182.77 +0.11/-0.21 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U-Pb zircon geochronology and a Bayesian Markov chain Monte Carlo (MCMC) stratigraphic age model.

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“…Integrated stratigraphic schemes also allow for high-accuracy correlations to other sedimentary successions, giving a global view of palaeoenvironmental conditions and their changes through time. Such integrated stratigraphic schemes are particularly important in the Early Jurassic, for which comparatively large uncertainties in the numerical ages of stage boundaries, durations of ammonite biozones and problems with long-range correlations still exist (Hesselbo et al 2020a).…”

mentioning

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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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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The Jurassic Period

Cited by 70 publications

References 281 publications

New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

New Chronostratigraphic Constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

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

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