Microbial mediation of textures and minerals – terrestrial or parent body processes?
Author:
Polgári Márta1, Gyollai Ildikó2, Bérczi Szaniszló3, Veres Miklós4, Gucsik Arnold5, Elemér Pál-Molnár6
Affiliation:
1. Research Centre for Astronomy and Geosciences, IGGR, HAS , 1112 Budapest , Budaörsi str. 45, Hungary ; Eszterházy Károly University , Dept. of Natural Geography and Geoinformatics , 3300 Eger , Leányka str. 6, Hungary 2. Research Centre for Astronomy and Geosciences, IGGR, HAS , 1112 Budapest , Budaörsi str. 45, Hungary 3. Eötvös University , Dept. of Materials Physics, Cosmic Materials Space Res. Group , H-1117 Budapest , Pázmány P. str. 1/a, Hungary 4. Wigner Research Centre for Physics, HAS , 1121 Budapest , Konkoly-Thege M. str. 29-33, Hungary 5. Eszterházy Károly University , Dept. of Natural Geography and Geoinformatics , 3300 Eger , Leányka str. 6, Hungary ; Wigner Research Centre for Physics, HAS , 1121 Budapest , Konkoly-Thege M. str. 29-33, Hungary ; University of Johannesburg , Department of Geology , 2600 Auckland Park, Johannesburg , South Africa 6. University of Szeged , Dept. of Mineralogy, Geochemistry and Petrology , 6722 Szeged , Egyetem str. 2, Hungary
Abstract
Abstract
Evolution of chondritic parent body is influenced by thermal, impact metamorphism and aqueous alteration, studied in Mező-Madaras, Knyahinya, Mócs and Nyírábrány in aspect of high resolution in situ textural, mineralogical and organic geochemical characteristics, using optical microscopy, FTIR-ATR and Raman spectroscopy. Our observations focused on Fe-containing opaque grains, glass, olivines and pyroxenes, which were well populated by micrometer-sized microbial filamentous elements in their boundary region within matrix and inside the minerals resembling mineralized microbially produced textures (MMPT), affecting 70-80 vol% of samples. In MMPT iron oxides (ferrihydrite, goethite), olivine, montmorillonite, kandite minerals and various hydrocarbon compounds were identified.
(1) Data confirmed dense and invasive terrestrial microbially mediated contamination in the chondrites, supported by microtexture, micromineralogy and embedded organic compounds. As the classical transformation processes are supposed nowadays to have been happened on the parent bodies, a contradiction arose: how could it be that these classical products are manifested in microbially mediated texture?
(2) Based on terrestrial analogies, microbial mediation is a sudden process comparing to geological times, very ancient, widespread and occur in various environments under determined conditions. It can consume previous and also produce new minerals. After formation, MMPT can survive billions of years proposing occurrence on parent bodies.
Publisher
Walter de Gruyter GmbH
Subject
Space and Planetary Science,Astronomy and Astrophysics
Reference82 articles.
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