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Si-Associated Goethite 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, DK-1871, Frederiksberg 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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The properties of Si-associated goethite from sediments in the Atlantis II and Thetis Deeps in the Red Sea have been investigated in order to determine the effect of Si on the mineral. Two types of morphologies dominate in most samples: multi-domain crystallites, probably due to elevated Na concentration in the initial brine from which the mineral had crystallized, and mono-domain, acicular crystals. Goethite crystals with elevated Si/Fe elemental ratios are usually smaller and poorly crystalline, exhibiting numerous crystal defects, whereas larger crystals with higher crystallinity have lower Si/Fe elemental ratios. The higher Si/Fe ratios in Atlantis II Deep goethites and the lower ratio in Thetis Deep goethites probably reflect the levels of Si concentration in the hydrothermal fluids from which goethite precipitated. At relatively low Si/Fe ratios, the major effect of Si is to retard growth of the crystallites, but only a small number of defects are formed. At high Si/Fe ratios the defect concentration affects the properties of the crystals, as observed with Mössbauer spectroscopy. The Si association with goethite affects crystallinity and crystal size as indicated by X-ray diffraction, infrared spectroscopy and high-resolution transmission electron microscopy.

Keywords

Analytical Electron MicroscopyAtlantis II DeepCrystal PropertiesHigh-resolution Transmission Electron MicroscopyHydrothermal SedimentsInfrared SpectroscopyMössbauer SpectroscopySi-associated GoethiteThetis DeepX-ray Diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 1 , February 2004 , pp. 115 - 129
Copyright
Copyright © 2004, The Clay Minerals Society

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