Microbial and geochemical features suggest iron redox cycling within bacteriogenic iron oxide-rich sediments
Microbial and geochemical features suggest iron redox cycling within bacteriogenic iron oxide-rich sediments
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DOI：
10.1016/j.chemgeo.2010.11.027
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发表时间：
2011-02-02
期刊：
影响因子：
3.9
通讯作者：
Fortin, Danielle
中科院分区：
文献类型：
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作者：
Gault, Andrew G.;Ibrahim, Alexandre;Fortin, Danielle
通过对环中性地下水渗漏中细菌成因氧化铁（BIOS）的地球化学、矿物学和微生物学研究，探讨了在这种环境中，细菌成因氧化铁对铁的氧化还原循环的控制作用。X射线衍射和扩展X射线吸收精细结构（EXAFS）光谱表明，2线水铁矿占主导地位（60-70%）的BIOS矿物学，更多的结晶纤铁矿和针铁矿相组成的其余部分，可能是产品的Fe（II）诱导的溶解-再沉淀途径。地下孔隙水剖面显示溶解的增加（
The geochemistry, mineralogy and microbiology of bacteriogenic iron oxides (BIOS) deposited at a circumneutral groundwater seep were examined to evaluate the biogeochemical controls on the redox cycle of iron in such environments. X-ray diffraction and extended X-ray absorption fine structure (EXAFS) spectroscopy showed that 2-line ferrihydrite dominated (60-70%) the BIOS mineralogy, with more crystalline lepidocrocite and goethite phases comprising the remainder, likely the product of Fe(II)-induced dissolution-reprecipitation pathways. Subsurface porewater profiles displayed an increase in dissolved (