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Lepidocrocite in Hydrothermal Sediments of the Atlantis II and Thetis Deeps, Red Sea

Published online by Cambridge University Press:  01 January 2024

Nurit Taitel Goldman ,
Christian Bender Koch  and
Arieh Singer
Nurit Taitel Goldman*
Affiliation:
The Open University of Israel, P.O. Box 39328 Tel Aviv, Israel The Seagram Center for Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot, Israel
Christian Bender Koch
Affiliation:
Chemistry Department, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, Frederiksberg, DK-1871 Frb.C., Denmark
Arieh Singer
Affiliation:
The Seagram Center for Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot, Israel
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Lepidocrocite (γ-FeOOH) formation in the hydrothermal brines of the Thetis and Atlantis II Deeps in the Red Sea results in markedly different crystals (size and shape). The only foreign element associated with the crystals is Si and analyses of samples from the two deeps yielded average Si/Fe (molar) ratios of 0.03 and 0.11, respectively. The Si/Fe ratio does not affect formation of a perfect lattice along [010]. Direct observations of crystal morphology as well as X-ray diffraction patterns, Mössbauer and infrared spectra, all indicate that the Atlantis II Deep lepidocrocite is less crystalline than the Thetis Deep lepidocrocite. In one sample a poly-disperse size distribution was resolved indicating a fine-scale variation in precipitation conditions. Infrared spectroscopy suggests that the Si is adsorbed on the lepidocrocite surfaces, probably also forming polymers, as both Fe-O-Si and Si-O-Si bonds can be detected. The formation of the Atlantis II Deep lepidocrocite is due to fast oxidation of Fe2+. The blanket-like layer of lepidocrocite in Atlantis II and Thetis Deeps lepidocrocite was probably formed as a result of precipitation during an abrupt oxidation event of the brine, triggered by down-welling of a condensed oxidized brine, which originated in the northern part of the Red Sea. A difference in Si concentrations determined the different crystal properties of the lepidocrocite formed in the two deeps.

Keywords

Analytical High-resolution Transmission Electron MicroscopyAtlantis II DeepElectron DiffractionHydrothermal SedimentsInfrared SpectroscopyMössbauer SpectroscopySi associated with LepidocrociteThetis Deep
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 2 , April 2002 , pp. 186 - 197
Copyright
Copyright © 2002, The Clay Minerals Society

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