The triassic-jurassic boundary event from an equatorial carbonate platform (Ghalilah formation, United Arab Emirates)

The Ghalilah Formation, UAE provides a complete and continuous equatorial shallow-water carbonate sequence through the Upper Triassic to Lower Jurassic interval. In higher latitudes, this interval is frequently associated with widespread ocean acidification evidenced by a lack of carbonates or a hiatus in deposition. The data presented here in contrast show evidence for aragonite supersaturation at the Triassic-Jurassic boundary in the equatorial Tethys. δ¹³C_carbshows a characteristic negative excursion with values as lowas −2.8‰just below the boundary. Deposition of fossiliferous limestones in this location persisted into the latest Rhaetian through the initial negative carbon isotope excursion.