Significant changes in land vegetation and oceanic redox across the Cretaceous/Paleogene boundary

Takuya Mizukami, Kunio Kaiho, Masahiro Oba

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The impact of an extraterrestrial body 65.5. Ma caused the so-called Cretaceous/Paleogene (K/Pg) event that resulted in a mass extinction and rapid changes in the surface environment on Earth. Here we report changes in land vegetation and oceanic redox across the K/Pg boundary at Caravaca, southeastern Spain, using biomarkers. The results reveal that the basal 3-mm-thick layer of the K/Pg boundary clay is marked by a rapid increase in the concentration of terrestrial long-chain n-alkanes and dibenzofuran, indicating the destruction of land vegetation and an increase in the supply of terrestrial organic matter into the marine environment during the deposition of the K/Pg boundary clay. This layer also records a rapid increase in the concentration of dibenzothiophenes, which indicates a change in redox conditions from oxic to anoxic/euxinic conditions in the intermediate water over the seafloor. The low-oxygen conditions could have been caused by an increase in the influx of terrestrial organic matter into the ocean. A rapid increase in the concentration of retene and retene/cadalene occurred during the deposition of the upper part of the boundary clay 10. kyr after the mass extinction, indicating the recovery of conifers, which greatly decreased at the K/Pg boundary.

Original languageEnglish
Pages (from-to)41-47
Number of pages7
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume369
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Anoxia
  • Biomarker
  • Cretaceous-Paleogene
  • Dissolved oxygen
  • Mass extinction
  • Plant
  • Recovery
  • Vegetation

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

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