Encyclopedia of Geobiology

2011 Edition
| Editors: Joachim Reitner, Volker Thiel

Biomarkers (Molecular Fossils)

  • Jochen J. Brocks
  • Kliti Grice
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-9212-1_30

Synonyms

Biological marker molecules; Geochemical fossils; Molecular fossils

Definition

Biomarkers are the molecular fossils of lipids and other natural products. In sedimentary environments, lipids that escape the remineralization process are commonly chemically reduced to hydrocarbon skeletons. Encased in sedimentary rocks, these skeletons can remain intact over hundreds of millions of years. The structure of biomarkers is often directly related to their precursor lipids and may be diagnostic for a specific group or groups of organisms. Diagnostic biomarkers are used to obtain information about the composition of past (microbial) ecosystems or to determine the first occurrence of organisms in the geological record. As many organisms prefer specific habitats, and as lipid compositions of individual organisms are frequently adjusted to changing physical and chemical conditions, biomarkers may also serve as paleoenvironmental proxies, for example for salinity, temperature, and...

Keywords

Sedimentary Organic Matter Acetic Acid Bacterium Green Sulfur Bacterium Purple Sulfur Bacterium Halophilic Archaea 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Jochen J. Brocks
    • 1
  • Kliti Grice
    • 2
  1. 1.Research School of Earth SciencesThe Australian National UniversityCanberraAustralia
  2. 2.WA Organic and Isotope Geochemistry Centre, Deparment of Applied ChemistryCurtin University of TechnologyPerthAustralia