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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

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Arias Fernández, María del Carmen (2013) 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. Palaeogeography, palaeoclimatology, palaeoecology, 387 . pp. 40-55. ISSN 0031-0182

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Official URL: http://www.elsevier.com/locate/palaeo



Abstract

The 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 about 12% of ostracod species and one suborder, the Metacopina (Superfamily Healdioidea). This
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.


Item Type:Article
Uncontrolled Keywords:Early Jurassic, Metacopine, Mass extinctions, Ostracoda, Low oxygen episodes, Water temperature
Subjects:Sciences > Geology > Paleontology
ID Code:26708
Deposited On:15 Sep 2014 07:59
Last Modified:11 Dec 2018 08:41

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