Carbon and Oxygen Isotope Compositions of Some Upper Cretaceous-Paleocene Sequences in Argentina and Chile

• Published in: International geology review 2001-10, Vol.43 (10), p.892-909
• Main Authors: Sial, A. N., Ferreira, V. P., Toselli, A. J., Parada, M. A., Acenolaza, F. G., Pimentel, M. M., Alonso, R. N.
• Format: Article
• Language: English
• ISSN: 0020-6814; 1938-2839
• DOI: 10.1080/00206810109465054

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 δ 13 C values from +1 to +2‰ PDB, with a negative incursion (−4‰ PDB) at the K-T transition. δ 13 C values in the Tunal Formation marls vary from −3 to −1‰ PDB. At Rocallosa Point, δ 13 C 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 δ 18 O fluctuations in the Yacoraite and Magellan carbonate rocks suggest a temperature drop at the K-T transition, followed by a temperature rise. High 87 Sr/ 86 Sr ratios (0.7140-0.7156) characterize the studied profiles of the Yacoraite Formation, documenting an important 87 Sr-enriched source of Sr to the water from which these carbonates precipitated. At the Magellan basin, 87 Sr/ 86 Sr ratios are closer to the expected values for the global Late Cretaceous-Paleocene ocean.