Title of article :
Abrupt and massive influx of terrestrial biomarkers into the marine environment at the Cretaceous–Tertiary boundary, Caravaca, Spain
Author/Authors :
Arinobu، نويسنده , , Tetsuya and Ishiwatari، نويسنده , , Ryoshi and Kaiho، نويسنده , , Kunio and Lamolda، نويسنده , , Marcos A. and Seno، نويسنده , , Hiroshi، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
9
From page :
108
To page :
116
Abstract :
The mass extinction at the Cretaceous–Tertiary (K/T) boundary ca. 65 million years ago caused a major change in the nature and abundance of global life in Earth history. We present the first vertical high-resolution records of molecular distributions of n-fatty acids across the K/T boundary at Caravaca (Spain). The results reveal that the first basal thin horizon (0 to + 0.5 cm; 0 = K/T boundary) of the K/T boundary–clay layer showed as much as a ~ 35-fold increase in concentrations of terrestrial long-chain n-fatty acids (≥ C20), representative of an eight-fold increase in mass accumulation rate, compared with the subjacent Cretaceous layers. Thereafter concentrations rapidly declined back to almost pre-boundary values within + 3 cm above the K/T boundary. The abrupt increase in supply of terrestrial organic matter into the marine environment at the K/T boundary could have been caused by an enhanced riverine flux, probably due to heavy rains associated with global warming, combined with enhanced fragments of terrestrial higher-plants withered by acid rain and/or by temporal darkness and cooling.
Keywords :
fatty acid , Biomarker , Cretaceous–Tertiary boundary , terrestrial influx
Journal title :
Palaeogeography, Palaeoclimatology, Palaeoecology
Serial Year :
2005
Journal title :
Palaeogeography, Palaeoclimatology, Palaeoecology
Record number :
2291397
Link To Document :
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