Plant taphonomy in a lake affected by volcanism (Agua de la Zorra Formation, Upper Triassic) Mendoza, Argentina

BENAVENTE, CECILIA ANDREA; MANCUSO, ADRIANA CECILIA; MANCUSO, ADRIANA CECILIA; PEDERNERA, TOMÁS; OTTONE, EDUARDO GUILLERMO; PEDERNERA, TOMÁS; OTTONE, EDUARDO GUILLERMO; BENAVENTE, CECILIA ANDREA

PALAIOS

SEPM-SOC SEDIMENTARY GEOLOGY

Lugar: Lawrence; Año: 2020

0883-1351

Volcanic eruptions have an impact in on the paleoecology of plant communities and their preservation of in the fossil record. The aim of this contribution is to evaluate the influence of volcanism on the plant preservation in lacustrine settings, through via systematic sampling and chemical analyses of fossil plants in the Upper Triassic Agua de la Zorra Formation, of the Argentinian Cuyana Basin. Plant remains are not uniformly preserved throughout the section of the Agua de la Zorra Formation and their stratigraphic distribution reflects the original spatial pattern of the plant communities. SEM-EDX analyses was used to demonstrate how volcanism affected the diagenesis of the plant remains. Eight taphonomic modes were determined from biostratinomic analysis, and three preservational modes from the chemical features observed in the SEM-EDX spectra. The three preservation modes recognized by SEM-EDX analysis are more likely linked to diagenesis and are not equivalent to the taphonomic modes described based on the biostratinomic features. The Agua de la Zorra paleolake preferentially preserved plant material because of anoxic conditions in deepere parts of the lakeat depth, and a high sedimentation rate in proximal near-shore facies. The plant remains are most abundant in sandy facies deposited by high-energy flows but there is no evidence that these flows were pyroclastic nor that the plant remains were generated by volcanic trauma.