Journal
ORGANIC GEOCHEMISTRY
Volume 41, Issue 9, Pages 975-980Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2010.03.007
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The distributions of aliphatic and aromatic terpenoids in Cretaceous and Paleogene angiosperm fossils from Japan were investigated Aliphatic A ring-degraded oleanane, ursane and lupane were found in all samples In addition, aliphatic gymnosperm-derived diterpenoids were detected in significant quantities Aromatic oleanane-type triterpenoids were the major components, with ursane- and lupane-type triterpenoids being minor compounds in all angiosperm fossils. In a Cretaceous gymnosperm fossil, major components included aliphatic labdane-. isopimarane- and abietane-type diterpenoids, aromatic abietane-type diterpenoids, and chrysene- and picene-type polyaromatic hydrocarbons (PAHs) Trace amounts of oleanane-. ursane- and lupane-type triterpenoids were also identified It is likely that the aromatic triterpenoids were introduced to the gymnosperm fossil from the angiosperm-derived material in the sediments. We defined an angiosperm/gymnosperm index (al-AGI') as an alternative to the aliphatic triterpenoid/diterpenoid ratio proposed in the literature The al-AGI' index may underestimate the angiosperm contribution, because the aliphatic angiosperm-derived triterpenoids are more readily converted to aromatic counterparts than the ditemenoicls during diagenesis An aromatic angiosperm/gymnosperm index (ar-AGI) can be calculated using aromatic diterpenoids and triterpenoids We suggest that ar-AGI is best calculated using only the oleanane-, ursane- and lupane-type aromatic tnterpenoids, and that the chrysene- and picene-type PAHs be excluded (C) 2010 Elsevier Ltd All rights reserved.
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