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Fluid channelization at the submicroscopic scale in exsolved orthoamphiboles

Eugene A. Smelik
Fluid channelization at the submicroscopic scale in exsolved orthoamphiboles
European Journal of Mineralogy (August 1995) 7 (4): 825-834


TEM study of incipient alteration of two exsolved orthoamphiboles from metamorphic terrains in New England, U.S.A., has shown that the planar exsolution microstructure exerts a strong influence on the fluid pathways during the initial stages of hydration. The exsolution microstructure consists of (010) or (120) lamellar mixtures of anthophyllite and gedrite; as the metamorphic fluids infiltrate the amphibole grains, the gedrite lamellae are preferentially attacked by the reactive fluid and transformed to a mixture of chlorite and quartz. The anthophyllite lamellae remain relatively unaffected by the fluid and thereby act as walls between the narrow channels of advancing fluid. The ability of the exsolution microstructure to channelize fluids depends on the scale of the lamellae, with the coarsest microstructures being the most effective. Most of the chlorite domains are coherently intergrown with the gedrite with a* (sub amph) c (super *) (sub chl) . AEM data allows the hydration reaction to be formulated: 1.0 gedrite + 0.24 Fe (super 2+) + 1.56 Mg (super 2+) + 6.46 H (sub 2) O ->> 1.51 chlorite + 1.64 quartz + 0.53 Na (super +) + 0.01 Mn (super 2+) + 2.84 H (super +) .

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 4
Title: Fluid channelization at the submicroscopic scale in exsolved orthoamphiboles
Author(s): Smelik, Eugene A.
Affiliation: Princeton University, Dept. of Geological and Geophysical Sciences, Princeton, NJ, United States
Pages: 825-834
Published: 199508
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 43
Accession Number: 1995-056098
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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