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GEOREF RECORD

Experimental alteration of a chlorite into a regularly interstratified chlorite-vermiculite by chemical oxidation

G. J. Ross and H. Kodama
Experimental alteration of a chlorite into a regularly interstratified chlorite-vermiculite by chemical oxidation
Clays and Clay Minerals (August 1976) 24 (4): 183-190

Abstract

A IIb orthochlorite (brunsvigite), from the chloritic metabasalt in the Middletown Valley of Maryland, was altered to a regularly interstratified chlorite-vermiculite after four months reaction in saturated bromine water on the steambath. The artificial weathering product resembles the regularly interstratified chlorite-vermiculite in a soil in Adams County, Pennsylvania, that has developed in greenstone similar to the chloritic metabasalt in the Middletown Valley of Maryland. The results of this and previous investigations on artificial and natural weathering of chlorites indicate that oxidation of structural Fe (super 2+) is an important reaction in the alteration of chlorites into vermiculitic products. The results also show that IIb orthochlorites, apparently structurally similar but having different Fe (super 2+) contents may react differently under the same weathering conditions. For example the acid oxidation treatment altered a IIb chlorite (diabantite) directly into a vermiculite, whereas the same treatment altered another IIb chlorite (brunsvigite) into a regularly interstratified chlorite-vermiculite. Detailed investigations of the chlorite structures are probably necessary to determine whether or not these alteration processes are structurally controlled.


ISSN: 0009-8604
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 24
Serial Issue: 4
Title: Experimental alteration of a chlorite into a regularly interstratified chlorite-vermiculite by chemical oxidation
Pages: 183-190
Published: 197608
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 27
Accession Number: 1977-032071
Categories: Mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1977
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