Search results for " Western Tethys"

showing 2 items of 2 documents

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

2018

Abstract A new δ13Ccarb curve was obtained from an expanded peritidal succession in western Sicily and was used to investigate the relationships between isotopic signatures and biological events on carbonate platforms across the Triassic-Jurassic boundary (TJB). The resulting curve shows two main negative carbon isotopic excursions (CIEs) that fit well with the “Initial” and “Main” CIEs that are recognized worldwide and linked to the End-Triassic Extinction (ETE). In the studied section, the first negative CIE marks the disappearance of the large megalodontids, which were replaced by small and thin-shelled specimens, while the “Main” CIE corresponds to the last occurrence (LO) of the megalo…

010506 paleontologySettore GEO/02 - Geologia Stratigrafica E SedimentologicaCarbonate platformStratigraphyAcidification; Carbon isotopes; Mass extinction; Sicily; Triassic-Jurassic boundary; Western Tethys; Geology; Stratigraphy010502 geochemistry & geophysics01 natural sciencesMass extinctionCarbon cycleAcidificationPaleontologychemistry.chemical_compoundSicily0105 earth and related environmental sciencesExtinction eventExtinctionCarbon isotopesGeologyTriassic-Jurassic boundarychemistryBenthic zoneIsotopes of carbonTriassic-Jurassic boundary Mass extinction Carbon isotopes Acidification Western Tethys SicilyCarbonateGeologyMarine transgressionWestern Tethys
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Shallow ocean oxygen decline during the end-Triassic mass extinction

2022

The end-Triassic mass extinction (ETME) was associated with intensified deep-water anoxia in epicontinental seas and mid-depth waters, yet the absolute oxygenation state in the shallow ocean is uncharacterized. Here we report carbonate-associated iodine data from the peritidal Mount Sparagio section (Southern Italy) that documents the ETME (~ 200 Ma) in the western Tethys. We find a sharp drop in carbonate I/(Ca + Mg) ratios across the extinction horizon and persisting into the Early Jurassic. This records local dissolved oxygen and iodate decline in the near-surface ocean of low-latitude Tethys due to the development of depleted oxygen concentrations. Consequently, during the ETME even sha…

Global and Planetary ChangeShallow ocean deoxygenationEnd-Triassic mass extinctionEnd-Triassic mass extinction I/(Ca + Mg) Shallow ocean deoxygenation Western TethysOceanographyEnd-Triassic mass extinction; I/(Ca + Mg); Shallow ocean deoxygenation; Western TethysI/(Ca + Mg)Western TethysGlobal and Planetary Change
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