%0 Journal Article
%A Arias Fernández, María Del Carmen
%T The early Toarcian (early Jurassic) ostracod extinction events in theIberian Range: The effect of temperature changes and prolongedexposure to low dissolved oxygen concentrations
%D 2013
%@ 0031-0182
%U https://hdl.handle.net/20.500.14352/33644
%X The early Toarcian extinction event, once regarded as spanning in the late Pliensbachian–early Toarcianboundary period, actually occurred in two distinct phases in the early Toarcian of the Iberian Range. Thefirst episode occurred in the Mirabile Subzone, Tenuicostatum Zone and is characterised by the disappearanceof about 12% of ostracod species and one suborder, the Metacopina (Superfamily Healdioidea). Thisstudy shows that this suborder disappears during stratigraphical intervals that are considered to be representativeof 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 suddenand widespread lethal increase in seawater temperature. These combined processes of oxygenation and temperaturechange are considered to be responsible for the profound changes in marine environments thatresulted in the early Toarcian ostracod extinction in the Iberian Range.
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