Illite polytypes studies in glacigenic sediments | Illīta politipu pētījumi glacigēnos nogulumos
2008
Luse, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences; University of Latvia, Riga (Latvia). Faculty of Geography and Earth Sciences. Dept. of Geology. Chair of Applied Geology | Seglins, V., University of Latvia, Riga (Latvia). Faculty of Geography and Earth Sciences. Dept. of Geology. Chair of Applied Geology | Stunda, A., Riga Technical Univ. (Latvia). Riga Biomaterials Innovation and Development Centre | Berzina-Cimdina, L., Riga Technical Univ. (Latvia). Riga Biomaterials Innovation and Development Centre
Illite mineral forms are studied by X-ray powder diffraction in fractions of is less than 1 mum of glacigenic and older basin sediments collected in Kuprava and Ulmale study areas. Samples were fractioned without chemical treatment and random samples were subjected to X-ray powder diffraction (XRPD) analysis. The presence of various mineral phases was established in the samples, crystallization level of illite was determined, and asymmetry of illite 002 reflex was observed. Poor non-basal illite reflexes appear among maxima of primary phases (quartz, albite, orthoclase) in XRPD spectra. Detritic origin 2M1 illite containing solitary reflexes of 1Mcv and 1Mtv polytype is predominant among 1Md structures. Glacigenic and underlying sediments show different intensity of reflexes corresponding to these polytypes. Diversity of illite 1Mtv and 1Mcv reflexes is observed either for glacigenic or underlying sediment samples of is less than 1 mum. The absence of some reflexes is observed: there is not observed 112 and -110 reflexes characteristic for 1Mcv polytype as well as 112 reflex characteristic for 1Mtv structure.
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