DOI: 10.1016/j.palaeo.2012.09.020
论文题名: Significant changes in land vegetation and oceanic redox across the Cretaceous/Paleogene boundary
作者: Mizukami T. ; Kaiho K. ; Oba M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 369 起始页码: 41
结束页码: 47
语种: 英语
英文关键词: Anoxia
; Biomarker
; Cretaceous-Paleogene
; Dissolved oxygen
; Mass extinction
; Plant
; Recovery
; Vegetation
英文摘要: 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. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69883
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geology and Paleontology, Tohoku University, Sendai 980-8578, Japan
Recommended Citation:
Mizukami T.,Kaiho K.,Oba M.. Significant changes in land vegetation and oceanic redox across the Cretaceous/Paleogene boundary[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,369