title: Bottom-water conditions in a marine basin after the Cretaceous-Paleogene impact event: timing the recovery of oxygen levels and productivity.
abstract: An ultra-high-resolution analysis of major and trace element contents from the Cretaceous-Paleogene boundary interval in the Caravaca section, southeast Spain, reveals a quick recovery of depositional conditions after the impact event. Enrichment/depletion profiles of redox sensitive elements indicate significant geochemical anomalies just within the boundary ejecta layer, supporting an instantaneous recovery--some 10(2) years--of pre-impact conditions in terms of oxygenation. Geochemical redox proxies point to oxygen levels comparable to those at the end of the Cretaceous shortly after impact, which is further evidenced by the contemporary macrobenthic colonization of opportunistic tracemakers. Recovery of the oxygen conditions was therefore several orders shorter than traditional proposals (10(4)-10(5) years), suggesting a probable rapid recovery of deep-sea ecosystems at bottom and in intermediate waters.
authors.affiliation: Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas-Universidad de Granada, Armilla, Granada, Spain.
authors.forename: Claudia
authors.initials: C
authors.lastname: Sosa-Montes De Oca
authors.affiliation: Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas-Universidad de Granada, Armilla, Granada, Spain.
authors.forename: Francisca
authors.initials: F
authors.lastname: Martínez-Ruiz
authors.affiliation: Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada, Spain.
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Rodríguez-Tovar
mesh_terms: D017753:Ecosystem; D053476:Extinction, Biological; D019015:Geologic Sediments; D008674:Metals, Rare Earth; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis*; D012623:Seawater; D013030:Spain; D013997:Time Factors
chemical_list: D008674:Metals, Rare Earth; D010100:Oxygen