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

IF 1.7 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Aquatic Geochemistry Pub Date : 2022-09-29 DOI:10.1007/s10498-022-09407-8

Fatih Sekerci, Nurgul Balci

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引用次数: 1

Abstract

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 (R_Si, R_Ca, R_Mg) 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).

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玄武岩微生物酸硫酸盐风化作用:酶促反应的意义

两种玄武岩分别在初始pH值为2的酸性硫酸盐和非酸性硫酸盐溶液中，在氧化亚铁杆菌存在和不存在的情况下进行反应，以确定玄武岩溶解是否能支持氧化亚铁杆菌的代谢活性生长。在生物和非生物实验中计算的相似元素释放率(RSi, RCa, RMg)表明，在酸性硫酸盐溶液中，微生物对玄武岩溶解的影响可以忽略不计。然而，与非生物实验相比，微生物实验中测量到的高浓度铁(III)aq证实了细菌的代谢。此外，检测到的细胞分裂和细胞总数随着实验的扩大而增加，进一步证明了在岩石溶解过程中代谢活跃的氧化亚铁杆菌的生长。黄钾铁矾((K, Na, h30)Fe3(SO4)2(OH)6)的形成只在生物实验中被归因于微生物催化的Fe(II)aq氧化。总的来说，我们的研究结果表明，与玄武岩反应的酸性溶液可以维持Fe(II)aq氧化细菌的生长。此外，仅在生物实验中鉴定黄钾铁矾强调了在酸性条件下玄武岩风化过程中酶催化铁(II)氧化是其形成的关键步骤，突出了其在地球和类地行星(如火星)上的生物特征潜力。

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来源期刊

Aquatic Geochemistry 地学-地球化学与地球物理

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： We publish original studies relating to the geochemistry of natural waters and their interactions with rocks and minerals under near Earth-surface conditions. Coverage includes theoretical, experimental, and modeling papers dealing with this subject area, as well as papers presenting observations of natural systems that stress major processes. The journal also presents `letter''-type papers for rapid publication and a limited number of review-type papers on topics of particularly broad interest or current major controversy.