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important tool in studies of sedimentary rocks where they may indicate environmental conditions and track the ultimate source rocks. They have commonly been used to investigate redox conditions of the environment (Elderfield & Pagett 1986, Wright et al. 1987, Shields & Stille 2001), record sea-level fluctuations (Wilde et al. 1996), and track the sources of REE input into marine environment (Martin et al. 1976, Elderfield & Greaves 1982, Hoyle et al. 1984, Goldstein & Jacobsen 1988, Elderfield et al. 1990, Mitra et al. 1994). Rare earth elements are found in all types of sedimentary rocks, but they are in particular present in high concentrations in marine phosphorites which are considered by some as a potential alternative source for the conventional natural REE resources (Altschuler et al. 1967, British Geological Survey 2011, Emsbo et al. 2015). They are also concentrated in Feand Mn-oxyhydroxide precipitates, which are taken as an efficient trap for REE in fresh-water and marine environments (Fleet 1984, Ruhlin & Owen 1986).

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Distribution and significance of rare earth elements in Cenomanian-Turonian phosphate components and mudstones from the Bohemian Cretaceous Basin, Czech Republic