Iron-framboids in the hydrocarbon-related Middle Devonian Hollard Mound of the Anti-Atlas mountain range in Morocco: Evidence of potential microbial biosignatures

Barbara Cavalazzi 1 Roberto Barbieri 2 Sherry L. Cady Annette D. George 3 Salvatore Gennaro Frances Westall 1 Alberto Lui 4 Roberto Canteri Angelo Pio Rossi 5 Gian Gabriele Ori 6 Kamal Taj-Eddine
1 CBM - Centre de biophysique moléculaire
2 Lethbridge Research and Development Centre
3 EMC - Laboratoire d'Etude des Mécanismes Cognitifs
4 FBK - Fondazione Bruno Kessler [Trento, Italy]
5 LERIA - Laboratoire d'Etudes et de Recherche en Informatique d'Angers
6 IPCMS - Institut de Physique et Chimie des Matériaux de Strasbourg
Abstract : Iron-framboids in the context of a Middle Devonian, hydrocarbon-seep conical mound (Anti-Atlas, Morocco) have been thoroughly investigated through a combination of techniques, including optical and high resolution scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, Raman microscopy and time-of-flight secondary ion mass spectroscopy. Framboids occur embedded in laminated carbonates of the mound and are precipitated along the veins that crosscut it and served as the conduits for (channeled) reduced hydrocarbon-rich fluids. The morphology, structure, and composition of the framboids contribute to the reconstruction of the complex interplay between the advected fluids and the associated biological and/or abiological processes. A comparison of our dataset with that from modern framboids formed under similar conditions indicates that the Fe-rich framboids represent replaced primary pyrite framboids produced as a consequence of bacterial sulfate reduction and the anaerobic oxidation of methane.
Keywords : Hydrocarbon seep Framboids Sulfide and iron minerals Biosignatures
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01337122
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Submitted on : Friday, June 24, 2016 - 3:09:20 PM
Last modification on : Friday, May 10, 2019 - 12:50:14 PM

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Barbara Cavalazzi, Roberto Barbieri, Sherry L. Cady, Annette D. George, Salvatore Gennaro, et al.. Iron-framboids in the hydrocarbon-related Middle Devonian Hollard Mound of the Anti-Atlas mountain range in Morocco: Evidence of potential microbial biosignatures. Sedimentary Geology, Elsevier, 2012, 263-264, pp.183-193. ⟨10.1016/j.sedgeo.2011.09.007⟩. ⟨insu-01337122⟩

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