Archaeal lipids record paleosalinity in hypersaline systems

Courtney Turich, Katherine Haines Freeman

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present an ecologically based biomarker method for estimating past salinity, especially in hypersaline conditions. The relative amounts of acyclic diether and tetraether membrane lipids synthesized by Archaea correlate with salinity from 0-250. practical. salinity. units (psu) in modern settings. We examined the preservation of this lipid biomarker-salinity relationship in ancient sedimentary organic matter using samples from two sequences of marls and diatomites deposited just prior to the Messinian Salinity Crisis. Salinity estimates were consistent with expected absolute salinity, as well as the amplitude of variations leading up to the Messinian Salinity Crisis. This lipid biomarker approach to salinity reconstruction complements existing paleosalinity proxies because (i) Archaea survive and thrive over a broad salinity range, well beyond that of haptophyte algae and other plankton which form the microfossil record and (ii) it provides fine salinity resolution for the wide range broadly defined as hypersaline. With the proxy, there is the potential to provide novel insights into salinity variation within desiccating basins in climatically sensitive seas (e.g. Dead Sea, Permian Delaware Basin), evolution of brines, timing of onset of hypersaline conditions and evaporite deposition.

Original languageEnglish (US)
Pages (from-to)1147-1157
Number of pages11
JournalOrganic Geochemistry
Volume42
Issue number9
DOIs
StatePublished - Oct 1 2011

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paleosalinity
Biomarkers
lipid
Lipids
salinity
Plankton
Brines
Algae
Membrane Lipids
Biological materials
biomarker
Messinian
diatomite
microfossil
basin evolution
evaporite
plankton

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

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Archaeal lipids record paleosalinity in hypersaline systems. / Turich, Courtney; Freeman, Katherine Haines.

In: Organic Geochemistry, Vol. 42, No. 9, 01.10.2011, p. 1147-1157.

Research output: Contribution to journalArticle

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