Abiotic formation of organic biomorphs under diagenetic conditions

Criouet, Isis; Bernard, Sylvain; Jaber, Maguy; Jacquemot, Pierre; Viennet, Jean‐Christophe

doi:10.7185/gold2021.7974

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“…However, we do not know whether the shape of abiotic organic spheroids could be preserved during advanced quartz (re)crystallization and metamorphism, which should be tested with further experiments. Moreover, the internal carbonaceous masses observed in Type 1 spheroids, and to a lesser extent in Types 2–3 spheroids are difficult to reconcile with organic microstructures shaped abiotically that can either form dense organic spheres (non‐cellular, e.g., (Criouet, Viennet, Jacquemot, Jaber, & Bernard, 2021) or cellular biomorphs with vesicular inclusions (McMahon & Cosmidis, 2021). The vesicular inclusions in cellular biomorphs do not appear to display enough organic matter to form the dense internal masses in Type 1 spheroids.…”

Section: Discussionmentioning

confidence: 99%

Distinguishing cellular from abiotic spheroidal microstructures in the ca. 3.4 Ga Strelley Pool Formation

et al. 2022

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The morphogenesis of most carbonaceous microstructures that resemble microfossils in Archean (4-2.5 Ga old) rocks remains debated. The associated carbonaceous matter may even-in some cases-derive from abiotic organic molecules. Mineral growths associated with organic matter migration may mimic microbial cells, some anatomical features, and known microfossils-in particular those with simple spheroid shapes.Here, spheroid microstructures from a chert of the ca. 3.4 Ga Strelley Pool Formation (SPF) of the Pilbara Craton (Western Australia) were imaged and analyzed with a com-

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Section: Discussionmentioning

confidence: 99%