Fruit and seed biomineralization and its effect on preservation

  • Erwan Messager
  • Aïcha Badou
  • François Fröhlich
  • Brigitte Deniaux
  • David Lordkipanidze
  • Pierre Voinchet
Original Paper

Abstract

Mineralised fruits and seeds are frequently found in archaeological sediments but their chemical nature has not been often examined. The nature and the origin of these archaeobotanical remains have to be investigated to understand their taphonomic history. Fruits or seeds can be mineralised not only by replacement mineralisation but also by biomineralisation during the plant life. The mineral components of three fossil fruits sampled on the Pleistocene site of Dmanisi were analysed and compared with their modern analogues. Analyses were carried out by means of an environmental scanning electron microscope, equipped with an energy dispersive X-ray device and by means of a Fourier transform infrared spectrometer. Biogenic carbonates and/or biogenic silica were identified in the fossil and modern fruits of some taxa. Comparison between fossil and modern specimens has shown that molecular reorganisation occurred in carbonate and in biogenic silica during fossilisation, through diagenetic processes. The resulting stable mineral structures confer an exceptional preservation to fruits in sediments. Taking into account these taphonomic specificities (transformation and differential preservation), the chronological and palaeoenvironmental aspects of the mineralised fruits are discussed.

Keywords

Fruit remains Biomineralisation Taphonomy X-ray EDS Scanning electronic environmental microscopy Fourier transform infrared spectroscopy 

Notes

Acknowledgments

This study was prepared in collaboration with the Georgian National Museum, the French Museum of Natural History (MNHN) and the René Ginouvès Institute for Archaeology and Anthropology (MAE). We wish to express our gratefulness to Lucy Mc Cobb for her comments on the paper and the English editing which significantly helped to improve the manuscript. This research was completed during a postdoctoral project coordinated by Stéphanie Thiébault and supported by the ‘Ile de France regional council’. We thank Dorian Q. Fuller and two anonymous reviewers for their constructive suggestions, which greatly improved our paper.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Erwan Messager
    • 1
    • 2
  • Aïcha Badou
    • 3
  • François Fröhlich
    • 3
  • Brigitte Deniaux
    • 2
  • David Lordkipanidze
    • 4
  • Pierre Voinchet
    • 2
  1. 1.Maison de l’Archéologie et de l’EthnologieNanterre cedexFrance
  2. 2.Département de PréhistoireMuséum national d’Histoire naturelleParisFrance
  3. 3.Département de PréhistoireMuséum national d’Histoire naturelleParis cedex 05France
  4. 4.Georgian National MuseumTbilisiGeorgia

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