Organic Matter Preservation and Incipient Mineralization of Microtubules in 120 Ma Basaltic Glass

Autor: Matthew R. M. Izawa, James J. Dynes, Neil R. Banerjee, Roberta L. Flemming, Lachlan C. W. MacLean, Callum J. Hetherington, Sergei Matveev, Gordon Southam
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Frontiers in Earth Science, Vol 7 (2019)
Druh dokumentu: article
ISSN: 2296-6463
DOI: 10.3389/feart.2019.00149
Popis: Hollow tubular structures in subaqueously-emplaced basaltic glass may represent trace fossils caused by microbially-mediated glass dissolution. Mineralized structures of similar morphology and spatial distribution in ancient, metamorphosed basaltic rocks have widely been interpreted as ichnofossils, possibly dating to ∼3.5 Ga or greater. Doubts have been raised, however, regarding the biogenicity of the original hollow tubules and granules in basaltic glass. In particular, although elevated levels of biologically-important elements such as C, S, N, and P as well as organic compounds have been detected in association with these structures, a direct detection of unambiguously biogenic organic molecules has not been accomplished. In this study, we describe the direct detection of proteins associated with tubular textures in basaltic glass using synchrotron X-ray spectromicroscopy. Protein-rich organic matter is shown to be associated with the margins of hollow and partly-mineralized tubules. Furthermore, a variety of tubule-infilling secondary minerals, including Ti-rich oxide phases, were observed filling and preserving the microtextures, demonstrating a mechanism whereby cellular materials may be preserved through geologic time.
Databáze: Directory of Open Access Journals
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