Introduction

Damborenea, Susana E.; Echevarría, Javier; Ros-Franch, Sonia

doi:10.1007/978-94-007-5098-2_1

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…The general Early Jurassic ocean circulation of the NW Tethys and adjacent shelf is thought to have been characterized by a gyre acting down to water depths of several hundred metres, perhaps modified by monsoonal processes (ref. 44 and references therein). The Jurassic palaeogeographic/palaeoceanic setting was similar to the modern North Atlantic Gulf Stream or North Pacific Kuroshio current with a general northward surface flow between ∼ 35 and 60°N ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Red arrows mark generalized palaeocurrents (see text, ref. 44 , and references therein). ( b ) Detail of Laurasian Seaway palaeogeography with the region affected by North Sea Dome as determined by the generalized outer limit of the Toarcian subcrop 40 .…”

Section: Figurementioning

confidence: 99%

“…SNS, Southern North Sea Basin, W, Wessex Basin. Figures modified from refs 12 , 45 , 44 and references therein.…”

Section: Figurementioning

confidence: 99%

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Jurassic climate mode governed by ocean gateway

et al. 2015

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The Jurassic (∼201–145 Myr ago) was long considered a warm ‘greenhouse' period; more recently cool, even ‘icehouse' episodes have been postulated. However, the mechanisms governing transition between so-called Warm Modes and Cool Modes are poorly known. Here we present a new large high-quality oxygen-isotope dataset from an interval that includes previously suggested mode transitions. Our results show an especially abrupt earliest Middle Jurassic (∼174 Ma) mid-latitude cooling of seawater by as much as 10 °C in the north–south Laurasian Seaway, a marine passage that connected the equatorial Tethys Ocean to the Boreal Sea. Coincidence in timing with large-scale regional lithospheric updoming of the North Sea region is striking, and we hypothesize that northward oceanic heat transport was impeded by uplift, triggering Cool Mode conditions more widely. This extreme climate-mode transition provides a counter-example to other Mesozoic transitions linked to quantitative change in atmospheric greenhouse gas content.

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Section: Discussionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Jurassic climate mode governed by ocean gateway

et al. 2015

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“…The carbon cycle also shows perturbations, with negative carbon isotope excursions recorded either by δ 13 C carb or δ 13 C org . The best documented of these excursions is the Sinemurian-Pliensbachian Boundary Event (SPBE or S-P Event), which is recognised in many areas, including, among others the Cleveland Basin (Hesselbo et al, 2000;Jenkyns et al, 2002;Korte and Hesselbo, 2011), the Wessex Basin in Dorset (Jenkyns and Weedon, 2013;Price et al, 2016;Schöllhorn et al, 2020a), the Cardigan Bay Basin in western Wales (van de Schootbrugge et al, 2005;Storm et al, 2020), the Lusitanian Basin (Duarte et al, 2014;Plancq et al, 2016), the Lombardian Basin and Trento platform (Franceschi et al, 2019), the Paris Basin (Peti et al, 2017;Bougeault et al, 2017), and the Central High Atlas Basin of Morocco (Danisch et al, 2019;Mercuzot et al, 2020). This negative excursion is recorded in carbonate rocks (δ 13 C carb ), belemnite rostra (δ 13 C bel ), and organic matter (δ 13 C org ), including fossil wood.…”

Section: Introductionmentioning

confidence: 99%

Million-year-scale alternation of warm–humid and semi-arid periods as a mid-latitude climate mode in the Early Jurassic (late Sinemurian, Laurasian Seaway)

et al. 2021

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Abstract. Clay mineral and stable isotope (C, O) data are reported from the upper Sinemurian (Lower Jurassic) of the Cardigan Bay Basin (Llanbedr–Mochras Farm borehole, northwestern Wales) and the Paris Basin (Montcornet borehole, northern France) to highlight the prevailing environmental and climatic conditions. In both basins, located at similar palaeolatitudes of 30–35∘ N, the clay mineral assemblages comprise chlorite, illite, illite–smectite mixed layers (R1 I-S), smectite, and kaolinite in various proportions. Because the influence of burial diagenesis and authigenesis is negligible in both boreholes, the clay minerals are interpreted to be derived from the erosion of the Caledonian and Variscan massifs, including their basement and pedogenic cover. In the Cardigan Bay Basin, the variations in the proportions of smectite and kaolinite are inversely related to each other through the entire upper Sinemurian. As in the succeeding Pliensbachian, the upper Sinemurian stratigraphic distribution reveals an alternation of kaolinite-rich intervals reflecting strong hydrolysing conditions and smectite-rich intervals indicating a semi-arid climate. Kaolinite is particularly abundant in the upper part of the obtusum zone and in the oxynotum zone, suggesting more intense hydrolysing conditions likely coeval with warm conditions responsible for an acceleration of the hydrological cycle. In the north of the Paris Basin, the succession is less continuous compared to the Cardigan Bay Basin site, as the oxynotum zone and the upper raricostatum zone are either absent or highly condensed. The clay assemblages are dominantly composed of illite and kaolinite without significant stratigraphic trends, but a smectite-rich interval identified in the obtusum zone is interpreted as a consequence of the emersion of the London–Brabant Massif following a lowering of sea level. Following a slight negative carbon isotope excursion at the obtusum–oxynotum zone transition, a long-term decrease in δ13Corg from the late oxynotum–early raricostatum zones is recorded in the two sites and may precede or partly include the negative carbon isotope excursion of the Sinemurian–Pliensbachian Boundary Event, which is recognised in most basins worldwide and interpreted to signify a late pulse of the Central Atlantic Magmatic Province volcanism.

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“…100–120 kyr after the extinction, that is, before peak warming and the depauperate interval of Thibodeau et al (2016) and while CAMP volcanism was still active. Several studies have shown that after the LTE, marine communities along the western coast of Pangea had lower diversity than those in Tethys (Damborenea et al 2013; Ritterbush et al 2014), although these apparent differences in recovery rates have not been explored in detail.…”

Section: Discussionmentioning

confidence: 99%

Bivalve body-size distribution through the Late Triassic mass extinction event

Opazo

Twitchett²

2022

Paleobiology

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The synergic relationship between physiology, ecology, and evolutionary process makes the body-size distribution (BSD) an essential component of the community ecology. Body size is highly susceptible to environmental change, and extreme upheavals, such as during a mass extinction event, could exert drastic changes on a taxon's BSD. It has been hypothesized that the Late Triassic mass extinction event (LTE) was triggered by intense global warming, linked to massive volcanic activity associated with the Central Atlantic Magmatic Province. We test the effects of the LTE on the BSD of fossil bivalve assemblages from three study sites spanning the Triassic/Jurassic boundary in the United Kingdom. Our results show that the effects of the LTE were rapid and synchronous across sites, and the BSDs of the bivalves record drastic changes associated with species turnover. No phylogenetic signal of size selectivity was recorded, although semi-infaunal species were apparently most susceptible to change. Each size class had the same likelihood of extinction during the LTE, which resulted in a platykurtic BSD with negative skew. The immediate postextinction assemblage exhibits a leptokurtic BSD, although with negative skew, wherein surviving species and newly appearing small-sized colonizers exhibit body sizes near the modal size. Recovery was relatively rapid (~100 kyr), and larger bivalves began to appear during the pre-Planorbis Zone, despite recurrent dysoxic/anoxic conditions. This study demonstrates how a mass extinction acts across the size spectrum in bivalves and shows how BSDs emerge from evolutionary and ecological processes.

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Introduction

Cited by 6 publications

References 21 publications

Jurassic climate mode governed by ocean gateway

Jurassic climate mode governed by ocean gateway

Million-year-scale alternation of warm–humid and semi-arid periods as a mid-latitude climate mode in the Early Jurassic (late Sinemurian, Laurasian Seaway)

Bivalve body-size distribution through the Late Triassic mass extinction event

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