Montanaro, Andrea (2023) Carbonate platform record of the end-Triassic mass extinction. [Tesi di dottorato]

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Abstract

The main aim of this PhD research project is to investigate the response of tropical carbonate platforms to global perturbations of the carbon cycle during the end-Triassic mass extinction. We have studied three southern-Tethyan sections that show persistent shallow-water carbonate sedimentation across the Triassic/Jurassic boundary: Mt. Messapion (Pelagonian Domain, Greece); Valle Agricola (Southern Apennines, Italy); Mt. Sparagio (Sicily, Italy). The sedimentological and micropaleontological analysis of Mt. Messapion and Valle Agricola sections allowed us to describe the record of biotic changes across the TJB and discuss how some carbonate platforms were able to keep growing in the shallow-water tropics despite the sudden extinction of the massive biocalcifiers during the end-Triassic mass extinction. Integrating biostratigraphy and carbon-isotope stratigraphy in the three studied sections permits us to build a high-resolution correlation framework across the Triassic/Jurassic boundary interval that can be reliably used for correlations of Tethyan tropical shallow-water records. Moreover, based on a reappraisal of the δ13Ccarb and δ13Corg records of well-dated sections of the Northern Calcareous Alps, Transdanubian Range and Lombardy Basin, we propose a correlation between Tethyan carbonate platforms and reference sections that has important implications for worldwide correlations and provides new insights into the timing and causes of the end-Triassic mass extinction in Tethyan tropical neritic ecosystems. Finally, we present the record of Hg concentration across the Triassic/Jurassic boundary interval in the Mt. Messapion section. The correlation with the Hg concentration records of reference sections suggests that the mercury anomaly at Mt. Messapion is not directly related to the volcanic activity of the Central Atlantic Magmatic Province.

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