ODP Leg 198 drilling on Shatsky Rise recovered a lower Aptian porcellanite (∼120.5 Ma) deposited during oceanic anoxic event (OAE) 1a that contains C36-C39 alkadienones: C37:2 and C 39:2 alkadien-2-ones and C36:2 and C38:2 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.
Recognition of alkenones in a lower Aptian porcellanite from the west-central Pacific / S.C. Brassell, M. Dumitrescu, T.J. Bralower, I. Premoli-Silva, M.J. Malone, M.A. Arthur, K. Averyt, P. Bown, J.E.T. Channell, L.J. Clarke, A.L. Dutton, J.W. Eleson, T.D. Frank, S. Gylesjö, H. Hancock, H. Kano, R.M. Leckie, K.M. Marsaglia, J. Mcguire, K.T. Moe, M.R. Petrizzo, S. Robinson, U. Röhl, W.W. Sager, K. Takeda, D. Thomas, T. Williams, J.C. Zachos. - In: ORGANIC GEOCHEMISTRY. - ISSN 0146-6380. - 35:2(2004), pp. 181-188.
Recognition of alkenones in a lower Aptian porcellanite from the west-central Pacific
M.R. Petrizzo;
2004
Abstract
ODP Leg 198 drilling on Shatsky Rise recovered a lower Aptian porcellanite (∼120.5 Ma) deposited during oceanic anoxic event (OAE) 1a that contains C36-C39 alkadienones: C37:2 and C 39:2 alkadien-2-ones and C36:2 and C38:2 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.
| File | Dimensione | Formato | |
|---|---|---|---|
|
1-s2.0-S0146638003002031-main.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
271.46 kB
Formato
Adobe PDF
|
271.46 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
