Recognition of alkenones in a lower Aptian porcellanite from the west-central Pacific

ODP Leg 198 drilling on Shatsky Rise recovered a lower Aptian porcellanite (~120.5 Ma) deposited during oceanic anoxic event (OAE) 1a that contains C sub(36)-C sub(39) alkadienones: C sub(37:2) and C sub(39:2) alkadien-2-ones and C sub(36:2) and C sub(38:2) alkadien-3-ones. This alkenone distributio...

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Bibliographic Details
Published in:Organic geochemistry 2004-02, Vol.35 (2), p.181-188
Main Authors: BRASSELL, Simon C, DUMITRESCU, Mirela
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemistry
Isotope geochemistry
Isotope geochemistry. Geochronology
Marine geology
Soil and rock geochemistry
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Summary:ODP Leg 198 drilling on Shatsky Rise recovered a lower Aptian porcellanite (~120.5 Ma) deposited during oceanic anoxic event (OAE) 1a that contains C sub(36)-C sub(39) alkadienones: C sub(37:2) and C sub(39:2) alkadien-2-ones and C sub(36:2) and C sub(38:2) alkadien-3-ones. This alkenone distribution differs from that typical of contemporary sediments and haptophyte algae, but resembles that of Cretaceous sediments from the Blake-Bahama basin. The discovery of alkenones in the early Aptian extends their sedimentary record by 15 M.y. to 120.5 M.y. and demonstrates the potential for long-term survival of these diagnostic functional lipids under favorable depositional conditions and subsequent shallow burial. It also contributes to the understanding and reconstruction of evolutionary developments in alkenone distributions and biosynthesis over geologic time.
ISSN:0146-6380
1873-5290
DOI:10.1016/j.orggeochem.2003.09.003