Registro de la relación isotópica de carbono en la paleoflora de la Formación Ischigualasto (Triásico Superior), noroeste Argentino: implicaciones paleoatmosféricas

A detailed isotopic analysis of the Upper Triassic flora from Ischigualasto / Talampaya Natural Parks, Argentina, reveals a mean carbon isotope ratio (δ13C) of -25.4‰, consistent with C3 plants and indicating minimal diagenetic alteration. This value is enriched by ~3‰ compared to Middle Triassic plants, suggesting a disturbance in the global carbon cycle during the Early Mesozoic. The study also estimates a paleo-atmospheric isotopic composition of -6.1‰, differing slightly from marine carbonate proxies, possibly due to atmospheric CO2/O2 ratios or hydric stress. The research provides critical data for chemostratigraphic correlation and offers insights into paleoatmospheric conditions during the Carnian period (~225 Ma).

Colombi, C., Montañez, I., & Parrish, J. (2011). Registro de la relación isotópica de carbono en la paleoflora de la Formación Ischigualasto (Triásico Superior), noroeste Argentino: implicaciones paleoatmosféricas. Revista Brasileira de Paleontologia, 14(1), 39–50. https://doi.org/10.4072/rbp.2011.1.04