Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas-Universidad de Granada, Armilla, Granada, Spain.
Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada, Spain.
PLoS One. 2013 Dec 13;8(12):e82242. doi: 10.1371/journal.pone.0082242. eCollection 2013.
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.
对西班牙东南部卡拉瓦卡剖面白垩纪-古近纪界线间隔的常量和微量元素进行超高分辨率分析，揭示了撞击事件后沉积条件的快速恢复。氧化还原敏感元素的富集/亏损剖面表明，在边界喷出物层内存在明显的地球化学异常，支持了在撞击后约 10^2 年内，即氧含量方面迅速恢复到撞击前的条件。地球化学氧化还原指标表明，氧含量与撞击后不久的白垩纪末期相当，这进一步证明了机会主义痕迹制造者的大型底栖生物在同期的殖民化。因此，氧气条件的恢复速度比传统的提议（10^4-10^5 年）要快几个数量级，这表明深海生态系统在底层和中层水域可能迅速恢复。
