Microbial Acid Sulfate Weathering of Basaltic Rocks: Implication for Enzymatic Reactions

Fatih Sekerci, Nurgul Balci*

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

1 Atıf (Scopus)

Özet

Two basaltic rocks were reacted in acid sulfate and non-acid sulfate solutions with an initial pH value of 2 in the presence and absence of A. ferrooxidans to determine if basalt dissolution can support the metabolically active growth of A. ferrooxidans. Similar elemental release rates (RSi, RCa, RMg) calculated for both biotic and abiotic experiments suggest rather a negligible microbial impact on the dissolution of basaltic rocks within the acid sulfate solution. Nevertheless, in contrast with the abiotic experiments, measurements of remarkably high concentration of Fe(III)aq in microbial experiments confirmed the bacterial metabolism. Moreover, detected cell division and increasing total cell numbers with the extent of the experiments provide further evidence for the growth of metabolically active A. ferrooxidans during the dissolution of the rocks. Formation of jarosite ((K, Na, H3O)Fe3(SO4)2(OH)6) only in the biotic experiments is attributed to the microbially catalyzed Fe(II)aq oxidation. Overall, our results showed that acidic solutions that reacted with basaltic rocks can sustain the growth of Fe(II)aq oxidizing bacteria. Furthermore, identification of jarosite only in the biotic experiments emphasizes the enzymatic Fe(II) oxidation as the key step for its formation during basalt weathering at acid conditions, highlighting its biosignature potential on Earth and Earth-like planets (e.g., Mars).

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)155-184
Sayfa sayısı30
DergiAquatic Geochemistry
Hacim28
Basın numarası3-4
DOI'lar
Yayın durumuYayınlandı - Ara 2022

Bibliyografik not

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature B.V.

Finansman

This study was supported by the Research Fund of Istanbul Technical University (42411) and the TUBITAK (The Scientific and Technological Research Council of Turkey) grant (119Y411) to Nurgul Balci.

FinansörlerFinansör numarası
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu119Y411
Istanbul Teknik Üniversitesi42411

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