INVESTIGADORES
PASSALIA Mauro Gabriel
artículos
Título:
Cretaceous pCO2 estimation from stomatal frequency analysis of gymnosperm leaves of Patagonia, Argentina
Autor/es:
PASSALIA, M.G.
Revista:
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Editorial:
Elsevier
Referencias:
Año: 2009 vol. 273 p. 17 - 24
ISSN:
0031-0182
Resumen:
Stomatal frequency of fossil conifers and ginkgoals cuticles were considered as potential indicators of the
pCO2 values in the Patagonian palaeoatmosphere during the Cretaceous. Samples are from continental
deposits of early Upper Aptian age (Anfiteatro de Ticó and Punta del Barco formations) and Upper AlbianCO2 values in the Patagonian palaeoatmosphere during the Cretaceous. Samples are from continental
deposits of early Upper Aptian age (Anfiteatro de Ticó and Punta del Barco formations) and Upper Albianfiteatro de Ticó and Punta del Barco formations) and Upper Albian
Lower Cenomanian age (Kachaike Formation), both outcropping in Andean and extra-Andean portions of
Santa Cruz province, Argentina. It can be inferred that the CO2 atmospheric content was similar during both
stages, or was slightly higher toward the Late AlbianEarly Cenomanian. The CO2 content estimated from the
conifers is between ~700 and 1400 ppmv (or lower from the mid-Aptian ginkgoals). This CO2 range is
consistent with those predicted worldwide by previous studies (stomatal indices, biogeochemical models
and carbon isotopes), and implies a CO2 content 2.34.0 times higher than present. The high atmospheric CO22 atmospheric content was similar during both
stages, or was slightly higher toward the Late AlbianEarly Cenomanian. The CO2 content estimated from the
conifers is between ~700 and 1400 ppmv (or lower from the mid-Aptian ginkgoals). This CO2 range is
consistent with those predicted worldwide by previous studies (stomatal indices, biogeochemical models
and carbon isotopes), and implies a CO2 content 2.34.0 times higher than present. The high atmospheric CO2Early Cenomanian. The CO2 content estimated from the
conifers is between ~700 and 1400 ppmv (or lower from the mid-Aptian ginkgoals). This CO2 range is
consistent with those predicted worldwide by previous studies (stomatal indices, biogeochemical models
and carbon isotopes), and implies a CO2 content 2.34.0 times higher than present. The high atmospheric CO22 range is
consistent with those predicted worldwide by previous studies (stomatal indices, biogeochemical models
and carbon isotopes), and implies a CO2 content 2.34.0 times higher than present. The high atmospheric CO22 content 2.34.0 times higher than present. The high atmospheric CO2
content during the Middle Aptian and Late AlbianEarly Cenomanian was probably linked to a warming
process at high latitudes during these times. This is consistent with the floristic development recorded
during both stages in Patagonia.Early Cenomanian was probably linked to a warming
process at high latitudes during these times. This is consistent with the floristic development recorded
during both stages in Patagonia.floristic development recorded
during both stages in Patagonia.