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Geology; August 1999; v. 27; no. 8; p. 723-726; DOI: 10.1130/0091-7613(1999)027<0723:SOPPAH>2.3.CO;2
© 1999 Geological Society of America
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Spike of pyrosynthetic polycyclic aromatic hydrocarbons associated with an abrupt decrease in {delta}13C of a terrestrial biomarker at the Cretaceous-Tertiary boundary at Caravaca, Spain

Tetsuya Arinobu1, Ryoshi Ishiwatari1, Kunio Kaiho2 and Marcos A. Lamolda3

1 Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0364, Japan
2 Institute of Geology and Paleontology, Tohoku University, Sendai 980-8578, Japan
3 Departamento de Estratigrafía y Paleontología, Universidad del País Vasco, Lejona 48940, Spain

The first vertical high-resolution record of polycyclic aromatic hydrocarbons (PAHs) of pyrosynthetic origin and the corresponding {delta}13C profile of a terrestrial biomarker across the Cretaceous-Tertiary (K-T) boundary at Caravaca, Spain, reveals the following. In comparison with adjacent Cretaceous marlstones, the first thin horizon (0 to +0.5 cm; 0 = the K-T boundary) of the boundary-clay layer is (1) enriched as much as 112 to 154 fold in typical pyrosynthetic PAHs such as coronene, benzo(g,h,i)perylene, and benzo(e)pyrene and (2) shows an abrupt {delta}13C decrease of 1.4{per thousand}–1.8{per thousand} in terrestrial higher plant-derived n-C29 alkane. The spike of pyrosynthetic PAHs associated with an abrupt decrease in {delta}13C value of a terrestrial biomarker is interpreted to reflect the prevalence of extensive fires with subsequent {delta}13C decrease in atmospheric CO2. It is estimated that the geologically instantaneous combustion of ~18%–24% of the terrestrial above-ground biomass would be necessary to account for the measured negative isotopic shift at the K-T boundary, on the basis of carbon mass balance between terrestrial above-ground biomass and atmosphere.




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