Limits in pyrolysis–GC–MS analysis of kerogen isolated from Archean cherts |
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| Institution: | 1. BioEMCo, UMR CNRS 7618, UPMC, 4 place Jussieu, 75252 Paris Cedex 05, France;2. LMCM, UMR CNRS 7202, MNHN, 61 rue Buffon, 75231 Paris Cedex 05, France;1. Institute of Earth Sciences, Ruprecht Karls University Heidelberg, Im Neuenheimer Feld 234-236, D-69120 Heidelberg, Germany;2. Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, D-55128 Mainz, Germany;3. Institute for Geosciences, Johannes Gutenberg University Mainz, Johann-Joachim-Becher-Weg 21, D-55099 Mainz, Germany;4. Department of Geography, Johannes Gutenberg University Mainz, Johann-Joachim-Becher-Weg 21, D-55099 Mainz, Germany;1. Lagerstätten und Rohstoffe, Technische Universität Clausthal, D-38678 Clausthal-Zellerfeld, Germany;2. Laboratório de Estudos Geocronológicos, Geodinâmicos e Ambientais, Instituto de Geociências, Universidade de Brasília, 70910-900 Brasília, DF, Brazil;3. Geo-T, Alameda das Cantigas 125, 34000-000 Nova Lima, MG, Brazil;4. Gerência de Exploração Mineral de Ferrosos, VALE, 34000-000 Nova Lima, MG, Brazil;1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT), Photovoltaics and Thin Film Electronics Laboratory, Rue de la Maladière 71, Neuchatel, 2002, Switzerland;2. Holst Centre, High Tech Campus 31, 5656 AE, Eindhoven, Netherlands;3. Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Technologie des Composites et Polymères (LTC), CH 1015, Lausanne, Switzerland |
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| Abstract: | Pyrolysis–GC–MS was recently proposed as an emerging technique for establishing biogenicity of 3.5 Gyr old insoluble organic matter in cherts (Derenne et al., 2008. Earth and Planetary Science Letters 272, 476–480). When applied to four kerogens isolated from Archean chert samples for biogenicity determination, this method highlights the importance of having a significant aliphatic component remaining in the kerogen. If not, fatty acid decarboxylation may bias the n-alkane distribution. However, in most cases, mature samples such as Archean cherts usually do not have such an aliphatic fraction. This shows the limits of the technique and the need for a new biogenicity marker. |
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