Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clay Minerals Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clay Minerals; March 2007; v. 42; no. 1; p. 21-43; DOI: 10.1180/claymin.2007.042.1.03
© 2007 Mineralogical Society of Great Britain and Ireland
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
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by GIORGETTI, G.
Right arrow Articles by WILSON, T. J.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Newly formed phyllosilicates in rock matrices and fractures from CRP-3 core (Antarctica): an electron microscopy study

G. GIORGETTI1,*, F. S. AGHIB2, K. J. T. LIVI3, A.-C. GAILLOT3 and T. J. WILSON4

1 Dipartimento di Scienze della Terra, Universitàdi Siena, Italy, 2 CNR-Istituto per le Dinamiche dei Processi Ambientali, Milano, Italy, 3 Department of Earth and Planetary Sciences, The John Hopkins University, Baltimore, USA, and 4 Department of Geological Sciences, Ohio State University, USA

* E-mail: giorgettig{at}unisi.it

(Received 5 September 2005; revised 12 October 2006)

A scanning and transmission electron microscopy study has been performed on Oligocene glacio-marine sediments, Devonian sandstones, and Jurassic dolerites recovered during CRP-3 drilling in the Ross Sea (Antarctica). Newly formed clay minerals occur in the rock matrices and as fillings in veins and faults which crosscut the whole sequence. Authigenic clays in sediments consist of beidellite-montmorillonite, berthierine/chlorite intergrowths and illite. Al,K-rich smectites and kaolinite occur in the Devonian sandstones. Saponite, berthierine/chlorite intergrowths, and Fe-hydroxides develop in the altered dolerites. Hence, the composition of the secondary phases depends also on the geochemistry of the rock they grow in. Within each sample, the same authigenic minerals form in the matrix and in the vein/fault. Clays precipitated from fluids, with variable fO2 values, which circulated in the system during the contemporaneous diagenetic and faulting events.

KEYWORDS: Ross Sea, CRP-3 core, authigenic phyllosilicates, chlorite, illite, smectite, SEM, TEM, EELS






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Mineralogical Society of Great Britain and Ireland