Astronomically-calibrated magnetostratigraphy of the Lower Jurassic marine successions at St. Audrie's Bay and East Quantoxhead (Hettangian–Sinemurian; Somerset, UK)

Hüsing, Silja K.; Beniest, Anouk; Boon, Annique van der; Abels, Hemmo A.; Deenen, M.H.L.; Ruhl, Micha; Krijgsman, Wout

doi:10.1016/j.palaeo.2014.03.022

Cited by 43 publications

(45 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15), and the Hettangian to lower Sinemurian record from St Audries Bay/East Quantoxhead/Kilve (Bristol Channel Basin, England, United Kingdom; refs. 4 and [17][18][19], which together represent the hitherto longest high-resolution δ 13 C TOC record of the Lower Jurassic, demonstrates that numerous medium-amplitude δ 13 C TOC shifts recorded in Mochras have previously been merged into what appears as stratigraphically more expanded shifts, or were missed entirely (Fig. 3).…”

Section: Discussionmentioning

confidence: 99%

“…3. δ 13 C TOC record of the Hettangian to Pliensbachian of the Mochras core, upper Hettangian to Pliensbachian of the Sancerre-Couy core, Paris Basin (15) and the composite Hettangian to lower Sinemurian record from the Bristol Channel Basin (4,(17)(18)(19). Key for identified ammonite subzones in Mochras given in Fig.…”

Section: Sinemmentioning

confidence: 99%

“…Controversial astronomical duration estimates are currently debated for the Hettangian Stage, ranging between 1.7/1.9 My and 4.1 My (17-19, 67, 68). The shorter estimates are derived from multiple astrochronological studies (17)(18)(19), with duration estimates from the Hartford Basin, United States, and the biostratigraphically well-constrained St Audries Bay succession, Somerset, United Kingdom, being effectively indistinguishable and supported by correlation to the geomagnetic polarity time scale, as well as radioisotopic ages for the Triassic-Jurassic boundary and earliest Sinemurian from the Pucará Basin, Peru (18,67,(69)(70)(71). The longer estimate of 4.1 My is based on cyclostratigraphic interpretation of spliced magnetic-susceptibility records from multiple UK locations, the individual sections of which suggest durations of 2.9 to 3.2 My (68).…”

Section: Sinemmentioning

confidence: 99%

“…Stratigraphically expanded shifts were recorded at the Sinemurian-Pliensbachian boundary (8)(9)(10)(11)(12)(13)(14) and the upper Pliensbachian margaritatus and spinatum zones (10,15,16). Furthermore, multiple stratigraphically less extended short-term δ 13 C shifts of ∼0.5 to 2‰ magnitude have been recognized throughout the Hettangian (17)(18)(19), in the Sinemurian (17,(20)(21)(22)(23)(24), and Pliensbachian (10,11,16,22,(25)(26)(27)(28), where they are recorded as individual shifts or series of shifts within stratigraphically limited sections. Some of these short-term δ 13 C excursions have been shown to represent changes in the supraregional to global carbon cycle, marked by synchronous changes in δ 13 C in marine and terrestrial organic and inorganic substrates and recorded on a wide geographic extent (e.g., refs.…”

mentioning

confidence: 99%

“…Therefore, these δ 13 C shifts have largely been interpreted as standalone events, linked to a release of 12 C from as-yet-undefined sources, reduced organic productivity (leaving more 12 C in the ocean-atmosphere system) and/or 13 C-depleted carbon sequestration and orbitally forced environmental change affecting the carbon cycle on the scale of Milankovitch cyclicity (17,20,24,25). Evidence for the latter is so far limited to the Hettangian to early Sinemurian and the early Toarcian, where high-resolution isotope records provide the basis for cyclostratigraphic analysis (17)(18)(19)(29)(30)(31).…”

mentioning

confidence: 99%

See 4 more Smart Citations

Orbital pacing and secular evolution of the Early Jurassic carbon cycle

Storm

Hesselbo

Jenkyns

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

120

111

View full text Add to dashboard Cite

Global perturbations to the Early Jurassic environment (∼201 to ∼174 Ma), notably during the Triassic–Jurassic transition and Toarcian Oceanic Anoxic Event, are well studied and largely associated with volcanogenic greenhouse gas emissions released by large igneous provinces. The long-term secular evolution, timing, and pacing of changes in the Early Jurassic carbon cycle that provide context for these events are thus far poorly understood due to a lack of continuous high-resolution δ13C data. Here we present a δ13CTOC record for the uppermost Rhaetian (Triassic) to Pliensbachian (Lower Jurassic), derived from a calcareous mudstone succession of the exceptionally expanded Llanbedr (Mochras Farm) borehole, Cardigan Bay Basin, Wales, United Kingdom. Combined with existing δ13CTOC data from the Toarcian, the compilation covers the entire Lower Jurassic. The dataset reproduces large-amplitude δ13CTOC excursions (>3‰) recognized elsewhere, at the Sinemurian–Pliensbachian transition and in the lower Toarcian serpentinum zone, as well as several previously identified medium-amplitude (∼0.5 to 2‰) shifts in the Hettangian to Pliensbachian interval. In addition, multiple hitherto undiscovered isotope shifts of comparable amplitude and stratigraphic extent are recorded, demonstrating that those similar features described earlier from stratigraphically more limited sections are nonunique in a long-term context. These shifts are identified as long-eccentricity (∼405-ky) orbital cycles. Orbital tuning of the δ13CTOC record provides the basis for an astrochronological duration estimate for the Pliensbachian and Sinemurian, giving implications for the duration of the Hettangian Stage. Overall the chemostratigraphy illustrates particular sensitivity of the marine carbon cycle to long-eccentricity orbital forcing.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Sinemmentioning

confidence: 99%

Section: Sinemmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Orbital pacing and secular evolution of the Early Jurassic carbon cycle

Storm

Hesselbo

Jenkyns

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

120

111

View full text Add to dashboard Cite

show abstract

Chemostratigraphy Across Major Chronological Boundaries

2018

Geophysical Monograph Series

View full text Add to dashboard Cite

The Triassic-Jurassic transition (~201.5 Ma) is marked by one of the largest mass extinctions in Earth's history. This was accompanied by significant perturbations in ocean and atmosphere geochemistry, including the global carbon cycle, as expressed by major fluctuations in carbon isotope ratios. Central Atlantic Magmatic Province (CAMP) volcanism triggered environmental changes and played a key role in this biotic crisis. Biostratigraphic and chronostratigraphic studies link the end-Triassic mass extinction with the early phases of CAMP volcanism, and notable mercury enrichments in geographically distributed marine and continental strata are shown to be coeval with the onset of the extrusive emplacement of CAMP. Sulfuric acid induced atmospheric aerosol clouds from subaerial CAMP volcanism can explain a brief, relatively cool seawater temperature pulse in the mid-paleolatitude Pan-European seaway across the T-J transition. The occurrence of CAMP-induced carbon degassing may explain the overall long-term shift toward much warmer conditions. The effect of CAMP volcanism on seawater 87 Sr/ 86 Sr values might have been indirect by driving enhanced continental weathering intensity. Changes in ocean-atmosphere geochemistry and associated (causative) effects on paleoclimatic, paleoenvironmental, and paleoceanographic con ditions on local, regional, and global scales are however not yet fully constrained.

show abstract

Chemostratigraphy Across the Triassic–Jurassic Boundary

Korte

Ruhl

Pálfy

et al. 2018

Chemostratigraphy Across Major Chronological Boundaries

View full text Add to dashboard Cite

INDEX Acidithiobacillus, 132 Amazon Craton biostratigraphy of, 102-4, 103f, 105f cap carbonate in southern, 98 contact between glacial deposits and cap carbonate in, 94, 97f Cryogenian-Ediacaran boundary in southern, 89-108, 90f, 92f, 95f-97f, 98f, 100f, 103f, 105f, 106f geological-structural setting of southern, 95f geologic map of southwestern, 90f global correlations with, 104-7, 105f, 106f insertion of post-Marinoan carbonates of, 106f lithostratigraphy and major geologic events of, 92f Marinoan cap carbonate in southern cap carbonate, 98-102, 98f, 100f cap dolostone, 99-101, 100f cap limestone cementstone, 101-2 Marinoan glacial deposits, 93-94, 95f, 96f paleobiology of, 102-4, 103f, 105f paleogeographic map for, 74f representative fossils of, 103f simplified stratigraphic section of glacial deposits with, 96f Ammonoids, 166 Angara Craton, 74f Anomaly, 29 Anticosti Island, 147f Apennines, 186f Araras Group acritarch specimens in, 104 carbon isotope chemostratigraphy for, 105f insertion of post-Marinoan carbonates of, 106f lithostratigraphy of, 105f microbial laminites in, 103 Aravalli-Bundelkhand Craton, 54-55, 54f, 59-60 Archean-Proterozoic boundary banded iron formation in, 35 BIF with, 42f chromium isotopes in, 39-40, 39f global change from, 35 Great Oxidation Event with, 9, 35-43, 36f, 38f, 39f, 41f, 42f molybdenum isotopes in, 40-41, 41f placement of, 42-43, 42f present atmospheric level exceeded by, 35, 37, 40-43 sulfur isotopes in, 36-38, 38f Arequipa Massif, 74f Argana Basin, 186f Argillaceous red, nodular, bioturbated wackestone, 166, 167f, 171f Aspidella, 131f Astartekløft, 192 Asteroid impact event, 224-25 Atar Group carbon isotope chemostratigraphy of, 80f Calcario Tangará quarry, 98f Calcium isotopes, 9-10 Calymmian period, 48, 51f, 52-53, 59, 64 depositional age for Dongchuan Group, 56 deposition of large red beds during, 61 sedimentary rocks of, 63 Calymmian rift, 47 Cambrian explosion, 123-24 CAMP. See Central Atlantic magmatic province Canada Ordovician paleogeographic position in, 147f Truro Island, Arctic in, 147f, 150-51, 152f Carbonate-associated sulfate (CAS) analyses in transitional Ediacaran to Cambrian successions, 123 composition of, 60 isotopic compositions of, 121-22 measurements of sulfur isotopes on, 8 Carbonate microfacies argillaceous red, nodular, bioturbated wackestone, 166, 167f, 171f gray/yellow nodular sponge wackestone, 166, 168f, 171f laminated bindstone, 166, 169f, 171f, 172f oncoid wackestone/floatstone, 166, 168, 170f, 172f Carbon isotopes, 5-6. See also Jurassic-Cretaceous carbon isotope geochemistry analysis and sampling strategies with, 165-66 Araras Group in chemostratigraphy with, 105f carbonate sequences data for, 58f, 59, 59f, 60 chemostratigraphy, 75f, 76f, 79f, 80f, 81f, 105f, 193, 194f-95f composition analysis results with, 172-74, 173f, 173t compositions in Mesoproterozoic-Neoproterozoic transition of, 81, 82f curves coupled with δ 53 Cr, 10, 12 Ediacaran-Cambrian transition, trends leading up to, 122 Permian-Triassic boundary with composition of, 160-62, ...

show abstract

Astronomically-calibrated magnetostratigraphy of the Lower Jurassic marine successions at St. Audrie's Bay and East Quantoxhead (Hettangian–Sinemurian; Somerset, UK)

Cited by 43 publications

References 55 publications

Orbital pacing and secular evolution of the Early Jurassic carbon cycle

Orbital pacing and secular evolution of the Early Jurassic carbon cycle

Chemostratigraphy Across Major Chronological Boundaries

Chemostratigraphy Across the Triassic–Jurassic Boundary

Contact Info

Product

Resources

About