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Layer Silicates from Serpentinite-Pegmatite Contact (Wiry, Lower Silesia, Poland)

Published online by Cambridge University Press:  28 February 2024

J. Jelitto ,
E. Dubińska ,
A. Wiewióra  and
P. Bylina
J. Jelitto
Affiliation:
Institute of Geochemistry, Mineralogy and Petrography, Faculty of Geology, Warsaw University, Żwirki i Wigury 93, 02-089 Warsaw, Poland
E. Dubińska
Affiliation:
Institute of Geochemistry, Mineralogy and Petrography, Faculty of Geology, Warsaw University, Żwirki i Wigury 93, 02-089 Warsaw, Poland
A. Wiewióra
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, Ÿwirki i Wigury 93, 02-089 Warsaw Poland
P. Bylina
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, Ÿwirki i Wigury 93, 02-089 Warsaw Poland
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Abstract

Highly tectonized contact between serpentinite and younger pegmatite in the magnesite mine of Wiry contains various layer silicates. Vermiculite, chlorite, smectite, and interstratified mica-vermiculite were recognized by means of routine XRD examination. Two three component interstratifications of mica-vermiculite-chlorite and chlorite-swelling chlorite-smectite were identified by a combined procedure of deconvolution of the XRD patterns and simulation of XRD tracings. A mineral with large diffraction maxima, displaying “chlorite intergrade” characteristics, appeared to be a mixture of chlorite, mixed layer chlorite-smectite, and vermiculite. Polytypes of phyllosilicates were determined by the X-ray transmission method. Due to the heritage of parent mineral polytype structure by transitional products of alteration, two distinct sequences of layer silicates were observed: one formed from trioctahedral mica (vermiculite, mixed layer mica-vermiculite); and one evolved from chlorite (e.g., mixed layer chlorite-swelling chloritesmectite). A tentative scheme of the primary contact zone structure, not obscured by subsequent brittle tectonics either by transformation of layer silicates, is proposed.

Keywords

ChloriteIntergradeMicaSEMSerpentinite/pegmatite contactThree component interstratified mineralsVermiculiteWeatheringX-ray powder
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 6 , December 1993 , pp. 693 - 701
Copyright
Copyright © 1993, The Clay Minerals Society

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