Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain

Gómez, Juan José Morales; Arias, C.

doi:10.1016/j.marmicro.2010.02.001

Cited by 61 publications

(52 citation statements)

References 81 publications

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“…The sedimentary record of the T-OAE is characterized by organic-rich sediments "black shales" associated with a distinctive negative excursion in the δ 13 C recorded in organic matter, biomarkers, marine carbonates, and fossil wood from marine and continental sections (e.g. Jenkyns & Clayton 1997, Jenkyns et al 2002, Cohen et al 2004, Suan et al 2008, Hermoso et al 2009a, Sabatino et al 2009, Bodin et al 2010, Gómez & Arias 2010, Littler et al 2010. In this sense, is significant and widely debated the absence of this excursion in the δ 13 C in the belemnite data (van de Schootbrugge et al 2005, McArthur 2007, Metodiev et al 2012).…”

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confidence: 99%

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Rodríguez‐Tovar¹,

Reolid²

2013

Bull. Geosci.

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A geochemical analysis has been conducted in the Fuente de la Vidriera section of the External Subbetic (Betic Cordillera, southern Spain) in order to interpret the incidence of the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost end of the Tethys. The obtained values of detrital, redox and palaeoproductivity proxies throughout the succession show minor fluctuations, but only punctual significant changes. Detrital input is nearly constant during the studied interval, except punctually in the lower part of serpentinum Zone, characterized by an increase in both fluvial and eolian detrital transport. Associated to this local higher fluvial and eolian activity, a comparatively higher concentration of organic matter is punctually registered, as revealed by the comparatively highest total organic carbon (TOC) value (0.99 wt.%). The remaining part of the section shows TOC values in the lower range of those registered in the Tethyan Toarcian sections (< 0.4 wt.%). The obtained ratios of redox-sensitive trace metals lead to the interpretation of oxic to dysoxic bottom-waters, with a singular sharp decrease in oxygenation corresponding to a short interval within the serpentinum Zone (sample FV-18) correlated to the T-OAE. The minor incidence of the T-OAE registered in this westernmost end of the Tethys, in which punctual dysoxic conditions are restricted only to a decimetre-scale interval reveals the importance of regional context and local oceanic-atmosphere dynamics on the local record of this phenomenon.•

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confidence: 99%

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Rodríguez‐Tovar¹,

Reolid²

2013

Bull. Geosci.

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“…The carbon isotope record of organic carbon of the Ibenan Range area confirms a distinct negative excursion in the lower part of the Elegantulum Subzone. This excursion is well correlated with that around the Tenuicostatum-Falciferum zone bOlll1dary in Northwest Europe (Gómez et al, 2008;Gómez and Arias, 2010 -.,…”

Section: Effects Oflow Dissolved Oxygen Content In Water On Ostracod mentioning

confidence: 56%

“…Another mechanism of extinction that has been argued to be most compatible with the observed ecological pattem of selectivity described among ostracod assemblages in the Iberian Range during the Toarcian crisis is related to changing climatic conditions (Arias, 2007;Gómez and Arias, 2010 ). Early Jurassic climate models reveal an Earth warmer than at present with a latitudinal temperature gradient dominated by high-latitude warming and slight tropical change (Arias, 2000;Arias and Whatley, 2005;Arias, 2007 ).…”

Section: The Effect Oiseawater Temperature Change On the Extinction Omentioning

confidence: 79%

“…Calculated temperatures using the equation of Anderson and Arthur ( 1983 ) reveal a long-term gradual temperature change of 4 c -7 cc, with values oscillating between about 9.2 cc atthe beginning of the Hawskerense subzone and 17 cc at the TenuicostatumSerpentinum zone bOlllldary (Comas-Rengifo et al, 2010;Gómez and Arias, 2010). Thus, seawater temperature (in the water column where belemnites lived) varies from a colder scenario at the PliensbachianToarcian boundary to substantially increased thermal conditions in the Elegantulum Subzone at the beginning of the Serpentinum Zone (Rosales et al, 2004;Gómez and Arias, 2010). Another type of information which would support the existence of this new warming period is the study of stable isotopes of carbon (Eg.…”

Section: The Effect Oiseawater Temperature Change On the Extinction Omentioning

confidence: 98%

“…1988;R6hl et al, 2001;van de Schootbrugge et al, 2005 ) in many Tethyan and Boreal sections, usually, serves to charactense the timing of the Toarcian Oceanic Anoxic Event (TOAE), a major oceanic anoxic event which charactensed the European epicontinental seas during the early Jurassic Uenkyns et al, 2002;Suan et al, 2008 ). Moreover, the time-equivalence of the early Toarcian anoxia episode and the high total organic carbon (TOe) concentration is divisive in northwest European and Mediterranean sections (Wignall et al, 2005;Maillot et al, 2006;Gómez et al, 2008;Gómez and Arias, 2010 ) (E g. 10). The carbon isotope record of organic carbon of the Ibenan Range area confirms a distinct negative excursion in the lower part of the Elegantulum Subzone.…”

Section: Effects Oflow Dissolved Oxygen Content In Water On Ostracod mentioning

confidence: 99%

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The early Toarcian (early Jurassic) ostracod extinction events in the Iberian Range: The effect of temperature changes and prolonged exposure to low dissolved oxygen concentrations

Arias

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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ABSTRAeT Keywords:Early Jurassic Metacopine Mass extinctions OstracodaThe early Toarcian extinction event, once regarded as spanning in the late Pliensbachian-early Toarcian boundary period, actually occurred in two distinct phases in the early Toarcian of the Iberian Range. The first episode occurred in the Mirabile Subzone, Tenuicostatum Zone and is characterised by the disappearance of abaut 12% of ostracod species and one suborder, the Metacopina (Superfamily Healdioidea). Ihis study shows that this suborder disappears during stratigraphical intervals that are considered to be representative of low oxygen conditions in the Iberian Range. The collapse of marine ecosystems (affecting up to 40% of ostracod species) in the Elegantulum Subzone, Serpentinum Zone was most likely triggered by a sudden and widespread lethal increase in seawater temperature. These combined processes of oxygenation and temperature change are considered to be responsible for the profound changes in marine environments that resulted in the early Toarcian ostracod extinction in the Iberian Range.Low oxygen episodes Water temperature

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Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

Gliwa

Forel

Crasquin

et al. 2020

Papers in Palaeontology

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The Aras Valley section (north-west Iran) exposes a sedimentary succession that allows the study of ostracod diversity patterns during/across the end-Permian mass extinction. For the present study, 59 samples were investigated for their ostracod abundances, which ranged from 4 to 31 500 specimens per 500 g. In 45 sample horizons, the ostracods were identified to the species level. In total, 3 425 specimens were determined and 62 species were identified, of which one genus and ten species are described for the first time:

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Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain

Cited by 61 publications

References 81 publications

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

Environmental conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the westernmost Tethys: influence of the regional context on a global phenomenon

The early Toarcian (early Jurassic) ostracod extinction events in the Iberian Range: The effect of temperature changes and prolonged exposure to low dissolved oxygen concentrations

Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

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