Boreskov

PP‐45According to these data, the average concentrations of several microelements incoupled carbonaceous and phosphatic deposits reveal positive correlation which mightprove that both ancient and Recent deposits formed in comparable marine environmentsowing to similar biogeochemical processes (Baturin, 1982). The partial correlation of somemetal contents (Pb, Ni, Cu, Zn) with average world shale abundances might be related totheir terrigenous origin. Besides, the exotic Hg enrichment of Maardu shale and phosphorite(our data) might be interpreted as postdepositional hydrothermal input induced by tectonicactivity.References[1]. Altschuler Z.S. The geochemistry of trace elements in marine phosphorites. Characteristic abundances andenrichment // SEPM Spec. Publ.1960. № 29. P. 19‐30.[2]. Baturin G.N. Phosphorites on the Sea Floor. Origin, Composition and Distribution. Elsevier, 1982. 343 p.[3]. Ketris M.P., Judovich Y.E. Estimation of clarks for carbonaceous biolithes: world averages for trace elementcontents in black shales and coals // Intern. J. Coal. Geol. 2009. V.78. P.135‐148.[4]. Turekian K.K., Wedepohl K.H. Distribution of elements in some major units of the Earth , s crust // Geol. Soc.Amer. Bull.1960. V.72. P. 175‐192.[5]. Vinogradov A.P. Average concentration of elements in rocks // Geochemistry.1962.№7. Р. 555‐571.216