Early Jurassic shallow water carbonate en- vironments of Tethys experienced important changes in a context of rifting that climaxed with the final break-up of Pangea. This time was also characterized by major perturba- tions of the global carbon cycle, some of which likely linked to the emplacement of large igneous provinces. At the Sinemurian– Pliensbachian (Early Jurassic) transition a globally recognized carbon isotope perturba- tion named “S–P Event” was found. In the western Tethys, this coincided with important architectural changes in the carbonate plat- forms which switched from peritidal flats to subtidal rimmed lagoons. A similar evolution in carbonate systems was observed during the Carnian Pluvial Episode (Late Triassic) when a global carbon isotope perturbation coin- cided with the demise of microbial carbonate platforms in the Tethys. In this paper, new carbonate and organic carbon isotope records and quantitative petrography data (modal analysis) from the deep- and shallow-water Sinemurian–Pliensbachian sedimentary suc- cessions exposed in the central Southern Alps of Italy are presented. Data show that across two negative carbon isotope excursions the carbonate factory abruptly changed and a drop in the microbial fraction of the carbon- ate occurred. This suggests that environmen- tal modifications associated with these isotope excursions impacted the type of carbonate production and were a key-factor in deter- mining the evolution of Tethyan carbonate platforms. New results and a comparison be- tween the S–P Event and the Carnian Pluvial Episode highlight striking commonalities and imply that the demise of microbial carbonate systems coincident to isotope perturbations is not an isolated event in geologic history. Microbialites, therefore, do not necessarily represent “crisis facies” following extinction events. Rather, their development or demise appears linked to yet poorly understood mechanisms governing the interaction be- tween global climate changes and shallow- water carbonate sedimentation.

Tethyan carbonate platform transformations during the Early Jurassic (Sinemurian-Pliensbachian, Southern Alps); comparison with the Late Triassic Carnian Pluvial Episode

Miriam Cobianchi;
2019-01-01

Abstract

Early Jurassic shallow water carbonate en- vironments of Tethys experienced important changes in a context of rifting that climaxed with the final break-up of Pangea. This time was also characterized by major perturba- tions of the global carbon cycle, some of which likely linked to the emplacement of large igneous provinces. At the Sinemurian– Pliensbachian (Early Jurassic) transition a globally recognized carbon isotope perturba- tion named “S–P Event” was found. In the western Tethys, this coincided with important architectural changes in the carbonate plat- forms which switched from peritidal flats to subtidal rimmed lagoons. A similar evolution in carbonate systems was observed during the Carnian Pluvial Episode (Late Triassic) when a global carbon isotope perturbation coin- cided with the demise of microbial carbonate platforms in the Tethys. In this paper, new carbonate and organic carbon isotope records and quantitative petrography data (modal analysis) from the deep- and shallow-water Sinemurian–Pliensbachian sedimentary suc- cessions exposed in the central Southern Alps of Italy are presented. Data show that across two negative carbon isotope excursions the carbonate factory abruptly changed and a drop in the microbial fraction of the carbon- ate occurred. This suggests that environmen- tal modifications associated with these isotope excursions impacted the type of carbonate production and were a key-factor in deter- mining the evolution of Tethyan carbonate platforms. New results and a comparison be- tween the S–P Event and the Carnian Pluvial Episode highlight striking commonalities and imply that the demise of microbial carbonate systems coincident to isotope perturbations is not an isolated event in geologic history. Microbialites, therefore, do not necessarily represent “crisis facies” following extinction events. Rather, their development or demise appears linked to yet poorly understood mechanisms governing the interaction be- tween global climate changes and shallow- water carbonate sedimentation.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1241566
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