RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 7, ES6003, doi:10.2205/2005ES000183, 2005
[18] Microfossils from terrigenous sediments were studied under light and electron microscopes in the organogenic residue of dissolved samples and in silty argillite petrographic slides. The thin sections were, wherever possible, approximated to the plane of metasediment layers. The dissolution was carried out according to a standard palynological procedure [Timofejev, 1966] using HF and HCl acids. Owing to small size, most of specimens were studied under immersion lenses. To provide a greater sterility of maceration, the processing was supplemented with an additional phase. The samples crushed to 0.5-1-cm fragments were repeatedly (12 to 15 times) washed with water. Thereupon rock fragments were partially dissolved in HF acid during 20 to 40 minutes and again repeatedly washed (12 to 15 times). These operations were followed by a complete dissolution and other standard phases of maceration process. Before the preparation of organic residues for studies under scanning electron microscopes Philips Sem 525M and XL30 ESEM TMP, they were processed in hydrogen peroxide with subsequent heating in nitric acid to boiling temperature, in order to remove a fine clayey carbonaceous fraction. The specimens were photographed digitally using SEM and under light microscope - using a common photomicrocamera with subsequent scanning of images.
Citation: 2005), Precambrian microfossil-characterized biotopes from the southern margin of the Siberian craton, Russ. J. Earth Sci., 7, ES6003, doi:10.2205/2005ES000183.
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