The end-Triassic mass extinction: A new correlation between extinction events and δ13C fluctuations from a Triassic-Jurassic peritidal succession in western Sicily

"Short" or "long" Rhaetian ? Astronomical calibration of Austrian key sections

“…A negative δ 13 C bulk org excursion occurs at its upper part and extends at the base of the Tiefengraben Member (Kürschner et al, 2007;Hillebrandt et al, 2013). This excursion correlates with the initial Carbon Isotope Excursion (CIE) well known in numerous other Triassic-Jurassic reference sections (Palfy et al, 2001;Hesselbo et al, 2002;Guex et al, 2004;Todaro et al, 2018). The CIE correlates also with an initial increase in Ir (Tanner et al, 2016).…”

Anthropogenic-scale CO2 degassing from the Central Atlantic Magmatic Province as a driver of the end-Triassic mass extinction

“…Only the results deriving from − 20‰ as δ 13 C of CO 2 input may fit with the δ 13 C record of carbonates, considering the precursor CIE, known as Marshi, in coincidence with the beginning of CAMP magmatism at the end-Triassic (Lindström et al, 2017Panfili et al, 2019;. Despite the slight differences in the magnitude of the negative CIE shifts from different geographical areas (Greene et al, 2012), the larger negative CIE shift (about 1.5‰) produced using − 20‰ as δ 13 C of CO 2 input is mostly consistent with the first end-Triassic δ 13 C shift of marine carbonates (generally < 3.0‰; Pálfy et al, 2001Pálfy et al, , 2007Korte et al, 2009;Clémence et al, 2010;Bachan et al, 2012;Todaro et al, 2018), lasting less than 0.1 Ma (Yager et al, 2017). This suggests that the isotopic composition of volcanic CO 2 may be more negative than the typically assumed δ 13 C value of − 5‰ (Mattey et al, 1984), or that other potential carbon sources may have been involved during CAMP emplacement (Heimdal et al, 2020;Capriolo et al, 2021).…”

“…The occurrence of ocean acidification during the end-Triassic extinction interval is testified by a decline of carbonate productivity (Clémence et al, 2010;Greene et al, 2012). However, the effects of lower seawater pH vary considerably among stratigraphic sections depending on the local variations of carbonate palaeoenvironments (Todaro et al, 2018). The rapid and pulsed input of volcanic CO 2 into the surface system may thus have caused significant global warming and ocean acidification, both of which are possible kill mechanisms for the end-Triassic mass extinction (Wignall, 2015;Dunhill et al, 2018b).…”

Carbonate slope re‐sedimentation in a tectonically‐active setting (Western Sicily Cretaceous Escarpment, Italy)

“…The lithostratigraphic setting of the peninsula has been the subject of several studies (Giunta & Liguori, , ; Abate et al ., ; Catalano et al ., , among others). However, only the facies stacking of the Upper Triassic–Lower Jurassic peritidal limestones has been analyzed in detail so far (Todaro et al ., , ). Other studies concentrated on the Cretaceous magmatic intrusions exposed in the south‐western sector of the peninsula (western part of the Mt Sparagio ridge; see Fig.…”