Climatic and palaeoceanographic changes during the Pliensbachian (Early Jurassic) inferred from clay mineralogy and stable isotope (C-O) geochemistry (NW Europe)

Bougeault, Cédric; Pellenard, Pierre; Deconinck, Jean‐François; Hesselbo, Stephen P.; Dommergues, Jean‐Louis; Bruneau, Ludovic; Cocquerez, Théophile; Laffont, Rémi; Huret, Émilia; Thibault, Nicolas

doi:10.1016/j.gloplacha.2017.01.005

Cited by 65 publications

(57 citation statements)

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“…Lower Jurassic rocks include a number of prominent carbon isotope excursions including one during the Toarcian Oceanic Anoxic Event (e.g., Jenkyns 1988;Hesselbo et al 2000aHesselbo et al , 2007Pálfy and Smith 2000;van de Schootbrugge et al 2005a;Gómez et al 2008;Suan et al 2008Suan et al , 2011Littler et al 2010;Korte and Hesselbo 2011;Silva et al 2011;Caswell and Coe 2012;Riding et al 2013;Kemp and Izumi 2014;Krencker et al 2014;Ait-Itto et al 2017;Arabas et al 2017;Bougeault et al 2017;Menini et al 2019;Mercuzot et al 2019). The TOAE has also been reported from Argentina (Al-Suwaidi et al 2010, 2016Mazzini et al 2010) and Chile (Fantasia et al 2018).…”

Section: Carbon Isotope Recordmentioning

confidence: 99%

“…Most of these have been identified via geochemical analyses of sedimentary rocks or their fossil content (e.g., Jenkyns 1988;Hesselbo et al 2000a;Jenkyns et al 2002;Korte et al 2009;Bodin et al 2016) and could be connected to pulses in the volcanic activity of the Karoo-Ferrar large igneous province influencing the atmospheric composition and thus the global climate. The strongest of these events was the Toarcian Oceanic Anoxic Event (TOAE) which is evident in the geological record by a prominent carbon isotope excursion and has been studied thoroughly over the last decades (e.g., Jenkyns 1988;Mettraux et al 1989;Hesselbo et al 2000aHesselbo et al , 2007McArthur et al 2000;Schmid-Röhl et al 2002;van de Schootbrugge et al 2005a;Metodiev and Koleva-Rekalova 2008;Suan et al 2008;Rodríguez-Tovar and Reolid 2013;Huang and Hesselbo 2014;Ullmann et al 2014;Ruhl et al 2016;Bougeault et al 2017). Following a phase of very low temperatures during the Late Pliensbachian, increased volcanic activity in the Early Toarcian in combination with other factors (such as the release of methane hydrates from continental shelfs; Hesselbo et al 2000a) seems to have caused perturbations in the carbon cycle, intense global warming, ocean acidification, and ultimately mass extinctions (e.g., Aberhan and Fürsich 1996;Pálfy and Smith 2000;Aberhan and Baumiller 2003;Cecca and Macchioni 2004;Gómez et al 2008;Dera et al 2010;Dera and Donnadieu 2012;Danise et al 2013;Huang and Hesselbo 2014;Krencker et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

2019

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The stable isotope (δ 13 C, δ 18 O) composition of a collection of Lower Jurassic brachiopods and oysters from the Andean Basin of northern Chile was analyzed. The results allow the first reconstruction of absolute water temperatures for several ammonite zones in the Lower Jurassic of South America. The temperature record starts with comparatively high values in the Late Sinemurian (average: 27.0°C; Raricostatum Zone). Just before the Sinemurian-Pliensbachian transition, temperatures dropped to an average of 24.3°C. The lowest temperature value in the dataset was recorded for a brachiopod shell of the latest Pliensbachian Spinatum Zone (19.6°C). No data are available for the Early Toarcian, but results for the late Toarcian show again comparatively warm conditions (average: 24.4°C; Thouarsense-Levesquei zones). Even though more material and analyses are necessary to corroborate the recorded temperatures, the present dataset seems to indicate the global nature of the Late Pliensbachian Cooling Event. In contrast, the global warming during the Toarcian Oceanic Anoxic Event has not been recorded due to a lack of Early Toarcian material. The δ 13 C record of brachiopods and oysters documents a gradual increase in values representing background conditions. Oyster shells were used for high-resolution stable isotope analyses and show seasonal temperature fluctuations over a period of around 3 years in the life time of the bivalves. If explained only by temperatures, the δ 18 O values point to a minimum estimate for the seasonality in the late Toarcian of slightly more than 3°C.

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Section: Carbon Isotope Recordmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

2019

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“…Most studies relating to climate change during the Pliensbachian period have been carried out using temperature proxies, notably δ 18 O measured on several calcite hard parts of molluscs and brachiopods. Highlighted are several cold intervals, the most prominent of these occurring in the latest Pliensbachian, time equivalent to the spinatum Zone (Bailey et al ., ; Rosales et al ., ; Dera et al ., ; Suan et al ., ; Harazim et al ., ; Gómez et al ., 2016a; Arabas et al ., ; Bougeault et al ., ). This cold episode could have been responsible for the formation of ice at high palaeolatitudes (Suan et al ., ), consistent with the supposed record of prominent obliquity cycles expressed as detrital input at mid‐latitudes by the end of the Pliensbachian (Boulila & Hinnov, ).…”

Section: Introductionmentioning

confidence: 97%

“…This cold episode could have been responsible for the formation of ice at high palaeolatitudes (Suan et al ., ), consistent with the supposed record of prominent obliquity cycles expressed as detrital input at mid‐latitudes by the end of the Pliensbachian (Boulila & Hinnov, ). By contrast, the stratigraphic interval including the davoei Zone corresponds to a warmer period characterized by an acceleration of the hydrological cycle (Rosales et al ., ; Dera et al ., ; Silva & Duarte, ; Price et al ., ; Bougeault et al ., ). However, fluctuations of humidity/aridity are still little explored or discussed.…”

Section: Introductionmentioning

confidence: 97%

Climatic and sea‐level control of Jurassic (Pliensbachian) clay mineral sedimentation in the Cardigan Bay Basin, Llanbedr (Mochras Farm) borehole, Wales

2019

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Early Jurassic climate is characterized by alternating cold and warm periods highlighted by studies based notably on oxygen isotopes measured on belemnite guards and other marine invertebrate shells. These climatic changes include changes in the hydrological cycle, and consequently weathering and runoff conditions. In order to clarify the erosion and weathering conditions during the Pliensbachian, this study determined the mineralogical composition of the clay fraction of 132 samples taken from the entire stage drilled in the Llanbedr (Mochras Farm) borehole (Cardigan Bay Basin). The clay mineral assemblages are composed of various proportions of chlorite, illite, illite/smectite mixed-layers (R1 I-S), smectite and kaolinite, with possibly occasional traces of berthierine. The occurrence of abundant smectite indicates that the maximum burial temperature never exceeded 70°C. Consequently, clay minerals are considered mainly detrital, and their fluctuations likely reflect environmental changes. The variations in the proportions of smectite and kaolinite are opposite to each other. Kaolinite is particularly abundant at the base of the jamesoni Zone, in part coinciding with the d 13 C negative excursion corresponding to the Sinemurian/Pliensbachian Boundary Event, and through the davoei Zone, whilst smectite is abundant in the upper part of jamesoni and base of ibex zones and through the subnodosus/ gibbosus subzones of the margaritatus Zone. The kaolinite-rich intervals reflect an intensification of hydrolysis and an acceleration of the hydrological cycle, while the smectite-rich intervals indicate a more arid climate. The spinatum Zone is characterized by a distinct clay assemblage with abundant primary minerals, R1 I-S, kaolinite reworked from previously deposited sediments or from Palaeozoic rocks, and probably berthierine originating from contemporaneous ironstone-generating environments of shallower waters. This mineralogical change by the end of the Pliensbachian likely reflects a transition from a dominant chemical weathering to a deeper physical erosion of the continent, probably related to a significant sea-level fall consistent with a glacio-eustatic origin.

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“…(C) Occurrence of dinoflagellate cysts in the Mochras core(22). (D) Paleotemperatures: orange = warming, blue = cooling(9,49,51,81), red = short-lived hyperthermals(21,24,48). (E) Timing of magmatic events: Central Magmatic Province (based on compilation in ref.…”

mentioning

confidence: 99%

Orbital pacing and secular evolution of the Early Jurassic carbon cycle

Storm

Hesselbo

Jenkyns

et al. 2020

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

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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.

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Climatic and palaeoceanographic changes during the Pliensbachian (Early Jurassic) inferred from clay mineralogy and stable isotope (C-O) geochemistry (NW Europe)

Abstract: Climatic and palaeoceanographic changes during the Pliensbachian (Early Jurassic) 2 inferred from clay mineralogy and stable isotope (C-O) geochemistry (NW Europe

Cited by 65 publications

References 97 publications

First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

Climatic and sea‐level control of Jurassic (Pliensbachian) clay mineral sedimentation in the Cardigan Bay Basin, Llanbedr (Mochras Farm) borehole, Wales

Orbital pacing and secular evolution of the Early Jurassic carbon cycle

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