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• W3132393106 endingPage "103491" @default.
• W3132393106 startingPage "103491" @default.
• W3132393106 abstract "Low-temperature hydrothermal systems are generally dominated by Fe–Si oxyhydroxide deposits. However, the formation process and mechanism of modern hydrothermal Fe–Si oxyhydroxides at ultra-slow spreading centers remain poorly understood. This study focused on six Fe–Si oxyhydroxide deposits collected from different sites at a typical ultra-slow spreading center, the Southwest Indian Ridge (SWIR). The mineralogical and geochemical evidence showed significant characteristics of a low-temperature hydrothermal origin. Sr and Nd isotope compositions of Fe–Si oxyhydroxide deposits at the SWIR probably reflected a combined signature of the hydrothermal fluids and seawater. Pb in the Fe–Si oxyhydroxides exhibited a close association with the substrate rocks and seawater. The Mössbauer spectra and iron speciation data further provided insights into iron-bearing phases in all deposits. Two different types of biomineralized forms were also discovered in these deposits by scanning electron microscopy (SEM) analysis. Energy-dispersive X-ray spectroscopy (EDS) and nanoscale secondary ion mass spectrometry (nanoSIMS) revealed that distinct biogenic structures were mainly composed of Fe, Si, and O, together with some trace elements. Based on these findings, we propose that microbial activity plays a significant role in the formation of Fe–Si oxyhydroxides at the ultra-slow spreading SWIR. • The geochemical and morphological tracers of Fe Si-oxyhydroxides extracted from different locations at the SWIR. • The Sr-Nd-Pb isotopes of deposits exhibited a close association with the substrate rocks, seawater and hydrothermal fluids. • Biomineralization may be responsible for the formation of Fe–Si oxyhydroxide deposits at the SWIR. • This work furthers our understanding of the biogeochemical processes associated with Fe and Si minerals at the SWIR." @default.
• W3132393106 created "2021-03-01" @default.
• W3132393106 creator A5039291898 @default.
• W3132393106 creator A5052946379 @default.
• W3132393106 creator A5066695272 @default.
• W3132393106 creator A5081717216 @default.
• W3132393106 creator A5082867785 @default.
• W3132393106 date "2021-04-01" @default.
• W3132393106 modified "2023-09-26" @default.
• W3132393106 title "Formation and origin of Fe–Si oxyhydroxide deposits at the ultra-slow spreading Southwest Indian Ridge" @default.
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