Organic geochemical evidence for global fires at the Cretaceous/Tertiary boundary
作者： M. I. Venkatesan , J. Dahl
DOI: 10.1038/338057A0
关键词:
摘要: MANY hypotheses have been advanced to explain the mass extinction at Cretaceous/Tertiary (K/T) boundary1–3. Recently, Wolbach et al. 4 suggested that massive forest fires were triggered by impact of a meteorite, and cite as evidence presence elemental carbon (mainly soot) from K/T boundaries5. Almost all airborne polycyclic aromatic hydrocarbons (PAHs) generated pyrosynthesis are adsorbed, through hydrogen bonding, on surface soot, participate fraction combustion6,7. Although soot itself is polymer polybenzenoid radicals, early termination polymerization leads enhanced PAH production. Pyrosynthesis PAHs thus favoured chemically reducing atmosphere. If there wildfires, group high-molecular-weight parent characteristic combustion, predominating over their alkyl homologues8,11, should be present in boundary samples known contain soot4,5. Here we compare New Zealand, Italy Denmark those above below boundary, find contents distribution profiles reflect pyrolytic origin. The data provide first detailed organic-molecular for combustion source organic sites.
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