Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods
Ullmann, C; Boyle, R; Duarte, LV; et al.Hesselbo, SP; Kasemann, SA; Klein, T; Lenton, TM; Piazza, V; Aberhan, M
Date: 16 April 2020
Journal
Scientific Reports
Publisher
Nature Publishing Group
Publisher DOI
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Abstract
Many aspects of the supposed hyperthermal Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, c.
182Ma) are well understood but a lack of robust palaeotemperature data severely limits reconstruction
of the processes that drove the T-OAE and associated environmental and biotic changes. New oxygen
isotope data from calcite shells ...
Many aspects of the supposed hyperthermal Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, c.
182Ma) are well understood but a lack of robust palaeotemperature data severely limits reconstruction
of the processes that drove the T-OAE and associated environmental and biotic changes. New oxygen
isotope data from calcite shells of the benthic fauna suggest that bottom water temperatures in the
western Tethys were elevated by c. 3.5°C through the entire T-OAE. Modelling supports the idea that
widespread marine anoxia was induced by a greenhouse-driven weathering pulse, and is compatible
with the OAE duration being extended by limitation of the global silicate weathering fux. In the
western Tethys Ocean, the later part of the T-OAE is characterized by abundant occurrences of the
brachiopod Soaresirhynchia, which exhibits characteristics of slow-growing, deep sea brachiopods. The
unlikely success of Soaresirhynchia in a hyperthermal event is attributed here to low metabolic rate,
which put it at an advantage over other species from shallow epicontinental environments with higher
metabolic demand.
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