A radiocarbon-based assessment of the preservation characteristics of crenarchaeol and alkenones from continental margin sediments

TitleA radiocarbon-based assessment of the preservation characteristics of crenarchaeol and alkenones from continental margin sediments
Publication TypeJournal Article
Year of Publication2008
AuthorsMollenhauer, G, Eglinton, TI, HopmanSd, EC, Damste, JSS
JournalOrganic Geochemistry
Volume39
Issue8
Pagination1039-1045
ISSN0146-6380
Abstract

Crenarchaeotal glycerol dibiphytanyl glycerol tetraether (GDGT) lipids and alkenones are two types of biomarkers, derived from planktonic marine microorganisms, which are used for reconstruction of sea surface temperature. We determined the radiocarbon contents of the archaeal GDGT crenarchaeol and of alkenones isolated from continental margin sediments. Systematic differences were found between the two biomarkers, with higher radiocarbon content in crenarchaeol than in the phytoplankton-derived alkenones. These differences can be explained by variable contributions of pre-aged, laterally-advected material to the core sites. Crenarchaeol appears to be more efficiently degraded during transport in oxygen-replete environments than alkenones. Whether this reflects the influence of chemical structure or mode of protection (e.g., particle association) is not known. (C) 2008 Elsevier Ltd. All rights reserved.

DOI10.1016/J.Orggeochem.2008.02.006