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Artículo

Carbon and oxygen isotope compositions of some upper cretaceous–paleocene sequences in argentina and chile

Sial, A. N.; Ferreira, V. P.; Toselli, Alejandro JoseIcon ; Parada, Marcela Alejandra; Aceñolaza, Florencio GilbertoIcon ; Pimentel, M. M.; Alonso, Ricardo NarcisoIcon
Fecha de publicación: 06/01/2001
Editorial: Taylor & Francis
Revista: International Geology Review
ISSN: 0020-6814
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

The Cretaceous-Paleocene (K-T) transition has been recorded in sedimentary carbonate rocks in northwestern Argentina and southern Chile. In the Yacoraite Basin, Argentina, this transition has been preserved in a 2 m thick marly layer, at the base of the Tunal Formation, which overlies lacustrine/marine carbonates of the Yacoraite Formation (Cabra Corral dam). The K-T transition is also preserved at Maimara, where Tertiary sandstones overlie a 50 m thick limestone bed of the Yacoraite Formation. In the Magellan Basin, Chile, glauconitic sandstones with calcitic cement and limestone concretions of the Maastrichtian Punta Rocallosa Formation are overlain by sandstones, claystones, and limestones of the Chorillo Chico Formation. The K-T transition is preserved in the lower portion of the Chorillo Chico Formation. Carbonates of the Yacoraite Formation display bulk-rock δ13C values from +1 to +2‰ PDB, with a negative incursion (−4‰ PDB) at the K-T transition. δ13C values in the Tunal Formation marls vary from −3 to −1‰ PDB. At Rocallosa Point, δ13C values in limestone strata, calcite cement, and limestone concretions vary from −4 to −33 ‰ PDB, and the lowest value in the Chorillo Chico Formation apparently marks the K-T transition. The δ18O fluctuations in the Yacoraite and Magellan carbonate rocks suggest a temperature drop at the K-T transition, followed by a temperature rise. High 87Sr/86Sr ratios (0.7140-0.7156) characterize the studied profiles of the Yacoraite Formation, documenting an important 87Sr-enriched source of Sr to the water from which these carbonates precipitated. At the Magellan basin, 87Sr/86Sr ratios are closer to the expected values for the global Late Cretaceous-Paleocene ocean.
Palabras clave: ISOTOPES , CARBON , CRETACEOUS , ANDES
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/128972
DOI: https://doi.org/10.1080/00206810109465054
URL: https://www.tandfonline.com/doi/abs/10.1080/00206810109465054
Colecciones
Articulos(CCT - SALTA-JUJUY)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SALTA-JUJUY
Citación
Sial, A. N.; Ferreira, V. P.; Toselli, Alejandro Jose; Parada, Marcela Alejandra; Aceñolaza, Florencio Gilberto; et al.; Carbon and oxygen isotope compositions of some upper cretaceous–paleocene sequences in argentina and chile; Taylor & Francis; International Geology Review; 43; 10; 6-1-2001; 892-909
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