Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clays and Clay Minerals Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clays and Clay Minerals; February 2004; v. 52; no. 1; p. 115-129; DOI: 10.1346/CCMN.2004.0520111
© 2004 Clay Minerals Society
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via ISI Web of Science (1)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Taitel-Goldman, N.
Right arrow Articles by Singer, A.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Si-ASSOCIATED GOETHITE IN HYDROTHERMAL SEDIMENTS OF THE ATLANTIS II AND THETIS DEEPS, RED SEA

Nurit Taitel-Goldman1,2,*, Christian Bender Koch3 and Arieh Singer2

1 The Open University of Israel, P.O. Box 39328 Tel Aviv, Israel
2 The Seagram Center for Soil and Water sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot, Israel
3 Chemistry Department, The Royal Veterinary and Agricultural University Thorvaldsensvej 40, DK-1871, Frederiksberg C., Denmark

* E-mail address of corresponding author: nuritg{at}openu.ac.il

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.

Key Words: Analytical Electron Microscopy • Atlantis II Deep • Crystal Properties • High-resolution Transmission Electron Microscopy • Hydrothermal Sediments • Infrared Spectroscopy • Mössbauer Spectroscopy • Si-associated Goethite • Thetis Deep • X-ray Diffraction






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Clay Minerals Society