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GDGT Thermometry: Lipid Tools for Reconstructing Paleotemperatures

Published online by Cambridge University Press:  21 July 2017

Jessica E. Tierney
Jessica E. Tierney*
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, MA USA 02543. tierney@whoi.edu
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Abstract

Microbial communities adjust the chemical structure of their cell membranes in response to environmental temperature. This enables the development of lipid-based paleothermometers such as the glycerol dialkyl glycerol tetraether (GDGT) proxies described here. Surface-sediment calibrations establish a strong empirical relationship between the relative distribution of GDGTs and temperature. GDGT proxies can be used in marine, lacustrine, and paleosol sequences as long as the organic material is not thermally mature. Thus far, GDGT proxies have been applied to sediments dating back to the middle Jurassic. Many of the key uncertainties of these proxies are related to our emerging understanding of archaeal (and for the branched GDGTs, bacterial) ecology.

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Research Article
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The Paleontological Society Papers , Volume 18: Reconstructing Earth's Deep-Time Climate , November 2012 , pp. 115 - 132
Copyright
Copyright © 2012 by The Paleontological Society 

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