Ammonoid multi-extinction crises during the Late Pliensbachian – Toarcian and carbon cycle instabilities
- 1Institute of Geology, Anthropole, University of Lausanne, Switzerland
- 2Museum d'Histoire Naturelle, Paris, France
- 3Institute of Geochemistry, Anthropole,University of Lausanne, Switzerland
- 4Dept. of Geology, Université Pierre et Marie Curie, Paris, France
- 5Earth and Environmental Sciences, University of Geneva, Rue des Maraîchers 13, 1205, Geneva, Switzerland
Abstract. Five crises affecting ammonite evolution occurred during the Late Pliensbachian to Late Toarcian stages (Early Jurassic). The first two (Gibbosus and end-Spinatum zones) occurred during highly cold and regressive conditions which were followed by a global anoxic event generated during a supergreenhouse warm event (Levisoni subzone) concomitant with a worldwide transgressive event. The last two (Late Variabilis and Late Insigne zones) are related to regressive events. We present new carbon isotope data from Southern Peru that demonstrate that most of the major Toarcian crises affecting ammonite evolution can be correlated with the variations affecting the δ13C during that unstable period. The morphogenetic reactions of the ammonites during the five different upper Liassic critical episodes are analysed, showing how this group can be used as stress indicators.
J. Guex et al.
J. Guex et al.
J. Guex et al.
10 citations as recorded by crossref.
- Eruptive history of the Karoo lava flows and their impact on early Jurassic environmental change M. Moulin et al. 10.1002/2016JB013354
- Two pulses of extinction of larger benthic foraminifera during the Pliensbachian-Toarcian and early Toarcian environmental crises S. Jiang et al. 10.1016/j.palaeo.2020.109998
- Response of macrobenthic communities to the Toarcian Oceanic Anoxic Event in northeastern Panthalassa (Ya Ha Tinda, Alberta, Canada) R. Martindale & M. Aberhan 10.1016/j.palaeo.2017.01.009
- Evaluating the temporal link between the Karoo LIP and climatic–biologic events of the Toarcian Stage with high-precision U–Pb geochronology B. Sell et al. 10.1016/j.epsl.2014.10.008
- Population response during an Oceanic Anoxic Event: The case of Posidonotis (Bivalvia) from the Lower Jurassic of the Neuquén Basin, Argentina S. Ros-Franch et al. 10.1016/j.palaeo.2019.04.009
- The middle Toarcian cold snap: Trigger of mass extinction and carbonate factory demise F. Krencker et al. 10.1016/j.gloplacha.2014.03.008
- Record ofJuraphyllitesex gr.libertus(Gemmellaro 1884) from the Ururoan Stage (Early Jurassic, New Zealand) and observations on the paleoenvironmental dynamics of the Ururoan ammonite fauna G. Stevens 10.1080/00288306.2014.958503
- High-precision U–Pb geochronology and a new chronostratigraphy for the Cañadón Asfalto Basin, Chubut, central Patagonia: Implications for terrestrial faunal and floral evolution in Jurassic R. Cúneo et al. 10.1016/j.gr.2013.01.010
- Astronomical constraints on the duration of the Early Jurassic Pliensbachian Stage and global climatic fluctuations M. Ruhl et al. 10.1016/j.epsl.2016.08.038
- Climate and environmental response to the break-up of Pangea during the Early Jurassic (Hettangian-Pliensbachian); the Dorset coast (UK) revisited I. Schöllhorn et al. 10.1016/j.gloplacha.2019.103096