INVESTIGADORES
RICCARDI Alberto Carlos
artículos
Título:
Cool early Albian climates: new data from Argentina
Autor/es:
PIRRIE, D., MARSHALL, J.D., DOYLE, P. & RICCARDI, A.C.
Revista:
CRETACEOUS RESEARCH (PRINT)
Editorial:
Elsevier Ltd.
Referencias:
Lugar: Amsterdam; Año: 2004 p. 27 - 33
ISSN:
0195-6671
Resumen:
Previous studies on the stable isotope geochemistry of dimitobelid belemnites from Antarctica and Australia indicated cool climatic conditions during the early Albian in the shelf seas around the Gondwanan margin. In this paper new analyses from diagenetically unaltered specimens of Dimitobelus cf. stimulus from the lower Albian of theRio Mayer Formation of Lago San Martin, southern Argentina are presented. Oxygen isotope values for diagenetically least altered samples give values ranging between d 18O 0.07 and 0.96 vPDB, which equate to a mean palaeotemperature of 9.5° C (assuming d w of -1.2 SMOW). These data are consistent with a model of cool lower Albian shelf seas in the Southern Hemisphere.
