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SERPENTINE-SMECTITE INTERSTRATIFIED MINERALS FROM LOWER SILESIA (SW POLAND)

Boris A. Sakharov¹, Elbieta Dubiska^2,, Pawe Bylina³, Jan A. Kozubowski⁴, Grzegorz Kapro² and Magorzata Frontczak-Baniewicz⁵

¹ Geological Institute, Russian Academy of Sciences, Pyzhevsky per. 7, 109017 Moscow, Russia
² Institute of Geochemistry, Mineralogy and Petrology, Faculty of Geology, Warsaw University, al. wirki i Wigury 93, 02-089 Warsaw, Poland
³ Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warsaw, Poland
⁴ Department of Material Engineering, Warsaw Technical University, ul. Narbutta 85, 02-524 Warsaw, Poland
⁵ Medical Research Center, Polish Academy of Sciences, ul. Pawiskiego 5, 02-106 Warsaw, Poland

^* E-mail address of corresponding author: dubinska{at}uw.edu.pl

Interstratified serpentine-smectite was found in the fine-grained fraction of altered metasomatic contact biotite-schists developed between serpentinite and granite-type rocks (Lower Silesia ophiolite sequence, Poland). Ni-rich serpentine-smectite is R0-interstratified lizardite (0.80)-stevensite (0.15)-vermiculite-like (0.05), with a coherent scattering domain (csd) of 5 layers (mean value). The Mg-rich variety of serpentine-smectite is R1 lizardite (0.80)-stevensite (0.20) with a csd size of 7 layers (mean value). A transmission electron microscope study revealed complex layer relationships, with zones composed of various serpentine-smectite packets having lizardite/smectite ratios of 3:1, 2:1, 1:1, 4:1 and scarce serpentine segregations. In both cases, the serpentine-smectites appear to be late products of alteration of the parent biotite-schist.

Experimental and calculated positions and intensities of reflections of the ethylene glycol-saturated, heated (250°C, thermal stage), and air-dried samples are in good agreement. Calculated X-ray diffraction patterns for interstratified glycolated and anhydrous serpentine-smectite are included in the Appendix.

Key Words: HRTEM • Interstratified Mineral • Laterite • Ni-bearing Layer Silicate • Serpentine-smectite • X-ray Diffraction

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