Early diagenetic transformation of higher-plant triterpenoids in deep-sea sediments from Baffin Bay

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doi: 10.1016/0016-7037(92)90326-E
Author(s): ten Haven, H. L.; Peakman, T. M.; Rullkötter, J.
Author Affiliation(s): Primary:
KFA Jülich, Inst. Pet. and Organ. Geochem., Julich, Federal Republic of Germany
Other:
Univ. Bristol, United Kingdom
Univ. Oldenberg, Federal Republic of Germany
Volume Title: Geochimica et Cosmochimica Acta
Source: Geochimica et Cosmochimica Acta, 56(5), p.2001-2024. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 CODEN: GCACAK
Note: In English. Presented in part at the 14th international meeting on Organic geochemistry, Paris, Sept. 1989. 92 refs.; illus. incl. 4 tables, sketch map
Summary: Abundant triterpenoids are reported of higher-plant origin including monodesmethyl derivatives and other oxidative degradation products from a deep-sea sedimentary sequence drilled at ODP Site 645, central Baffin Bay. Compounds identified in the aliphatic hydrocarbon fraction, the aromatic hydrocarbon fraction, the alcohol fraction and in the ketone/ester fraction, are listed. Synthesis of reference compounds was crucial to the identification of these compounds. Isomerization is shown to be an important transformation step of higher-plant triterpenoids involving the rearrangement of less-stable skeletons into more stable ones, and double-bond isomerization within the oleanene series. Suitable oleanene isomers are then available for reduction to oleanane and 18 alpha -oleanane which occur in more mature fossil organic matter and crude oils. Despite the presence of only a limited number of basic skeletons, there is a complex interrelationship between the supply of precursor molecules to the sediments and their diagenetic transformations. But the evidence provided shows that the transformation processes described are diagenetic.
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 06 Petrology, Sedimentary; Arctic Ocean; Baffin Bay; Cenozoic; Deep-sea environment; Diagenesis; Early diagenesis; Geochemistry; Hydrocarbons; Isoprenoids; Leg 105; Marine environment; Marine sediments; ODP Site 645; Ocean Drilling Program; Organic compounds; Organic materials; Sediments; Triterpenoids
Coordinates: N702730 N702730 W0643924 W0643924
Record ID: 1992053700
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom