Similarity analysis of Ostracoda faunas in the Western Tethys during the Late Pliensbachian-Early Toarcian (Early Jurassic)

Soulimane, Choukri; Marok, Abbas; Reolid, Matías

doi:10.1007/s12517-020-5178-2

Cited by 3 publications

(2 citation statements)

References 59 publications

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“…The bottom topography of the basin would be irregular with different semigrabens and variable subsidence (Vera, 2001;Nieto et al, 2004;Reolid et al, 2015), as observed in other Tethyan Alpine do-mains (e.g. Jenkyns, 1988;Graciansky et al, 1998;Soussi and Ben Ismail, 2000;Marok and Reolid, 2012).…”

Section: Interpretation Of Facies and Microfaciesmentioning

confidence: 92%

“…The genus Bairdia is a shallow infaunal to epifaunal form (Sohn, 1960) interpreted as an opportunist (Fohrer and Samankassou, 2005;Reolid, 2014a). Metacopina (Healdiidae) are not recorded after the biotic crisis as widely as in other Tethys localities (Boomer and Whatley, 1992;Whatley et al, 1994;Arias and Whatley, 2004;Boomer et al, 2008;Arias, 2013;Cabral et al, 2013;Soulimane et al, 2017aSoulimane et al, , 2020. The Jenkyns Event marks the global extinction of Metacopina (e.g.…”

Section: Recovery Phasementioning

confidence: 99%

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Microfossil assemblages and geochemistry for interpreting the incidence of the Jenkyns Event (early Toarcian) in the south-eastern Iberian Palaeomargin (External Subbetic, SE Spain)

Reolid¹

2020

J. Micropalaeontol.

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Abstract. By studying the facies, geochemistry, and microfossil assemblages of the uppermost Pliensbachian and lower Toarcian of the Cueva del Agua section, I was able to appraise the impact of the Jenkyns Event in the eastern part of the South Iberian Palaeomargin (Western Tethys). Depleted oxygen conditions are envisaged for the Polymorphum–Serpentinum Zone boundary (lower Toarcian), represented by dark marls, precisely in a laminated interval. The decrease in the α diversity of foraminifera and ostracods, along with greater proportions of opportunists such as Lenticulina, Eoguttulina, and Cytherella just before the negative carbon isotopic excursion (CIE), would indicate a disturbance of the environmental conditions during the initial phase of the biotic crisis. The peak of the biotic crisis is characterized by an absence of trace fossils, increased organic matter content, an increased Mo∕Al ratio, and negative CIE and δ18O, as well as fewer specialist forms and more opportunists. This biotic crisis peak is related to oxygen-depleted conditions in the bottom waters and in the sediment pore water, while warming negatively affected microfauna – to the point of leaving a barren benthic horizon in the record. Recovery is evidenced by the occurrence of carbonate layers with hummocky cross-stratification and a decrease in organic matter content, the Mo∕Al ratio, and the trace fossil record. In terms of microfauna, the first phase of recovery shows highly abundant foraminifera, ostracods, and microgastropods, mainly opportunist forms. After the proliferation of opportunist forms, a second phase of recovery is marked by a progressive increase in α diversity.

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Section: Interpretation Of Facies and Microfaciesmentioning

confidence: 92%

Section: Recovery Phasementioning

confidence: 99%

Microfossil assemblages and geochemistry for interpreting the incidence of the Jenkyns Event (early Toarcian) in the south-eastern Iberian Palaeomargin (External Subbetic, SE Spain)

Reolid¹

2020

J. Micropalaeontol.

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Changes in benthic microfossil assemblages before, during and after the early Toarcian biotic crisis in the Portland-Wight Basin (Kerr McGee 97/12-1 well, offshore southern England)

Reolid

Ainsworth²

2022

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Halimedides record in the Asturian Basin (northern Spain): supporting the Toarcian Oceanic Anoxic Event relationship

Fernández-Martínez

Rodríguez‐Tovar

Piñuela

et al. 2021

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Recent ichnological analysis conducted in two sections (Rodiles and Lastres) of the Asturian Basin revealed the presence of Halimedides Lorenz von Liburnau 1902, which occurs just above the black shales related to the end of the T-OAE. Halimedides is associated with the recovery of the tracemaker community after the reestablishment of favourable, oxic, conditions. The appearance of Halimedides after the T-OAE event, previously not registered, supports the close relationship of the tracemaker with oxygen conditions, as occurs in other anoxic events including the Cretaceous OAE-1a and OAE-2. Also a relation between morphometric and paleoenvironmental parameters is observed, occurring larger and densely chambered specimens in darker, weakly oxygenated facies, while smaller and sparsely chambered forms are registered in lighter, better oxygenated sediments.

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Similarity analysis of Ostracoda faunas in the Western Tethys during the Late Pliensbachian-Early Toarcian (Early Jurassic)

Cited by 3 publications

References 59 publications

Microfossil assemblages and geochemistry for interpreting the incidence of the Jenkyns Event (early Toarcian) in the south-eastern Iberian Palaeomargin (External Subbetic, SE Spain)

Microfossil assemblages and geochemistry for interpreting the incidence of the Jenkyns Event (early Toarcian) in the south-eastern Iberian Palaeomargin (External Subbetic, SE Spain)

Changes in benthic microfossil assemblages before, during and after the early Toarcian biotic crisis in the Portland-Wight Basin (Kerr McGee 97/12-1 well, offshore southern England)

The Halimedides record in the Asturian Basin (northern Spain): supporting the Toarcian Oceanic Anoxic Event relationship

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