Microelement Composition of Boundary Cenomanian-Turonian Sediments of Mountain Crimea and Northern-Western Caucasus As The Evidence of Global Anoxic Event
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V. I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, Moscow 119991, Kosygin str., 19, Russia
Irina V. Kubrakova   

V. I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, Moscow 119991, Kosygin str., 19, Russia
Online publication date: 2007-10-01
Publication date: 2007-10-01
Eurasian J Anal Chem 2008;3(1):91–112
To study the origin of sedimentary rocks of Mountain Crimea and Northern-Western Caucasus, a composition of rock samples was studied and the geochemical ratios of the elements in them were determined. Analytical data were obtained on the basis of a comprehensive approach including determination of total and organic carbon by CHNS-analysis, as well as macro- and microcomponents by atomic emission spectrometry with inductively coupled plasma (ICP-AES) and electrothermal atomic absorption spectrometry (ETAAS) after microwave-assisted sample preparation. For low contents of rare earth elements (REEs) preliminary cation-exchange matrix separation on Dowex AG 50W-X8 was used. That, in combination with calculated interelement correction coefficients, permitted ICP-AES determination of all REEs, Y and Sc with good precision (RSD below 10%) and detection limits (DLs) varying from 0.025 μg g-1 (Eu, Ho, La, Lu, Y, Yb, Sc) to 0.10 μg g-1 (Dy, Er, Gd). Noble metals were determined by ETAAS using slurry technique with DLs 2 ng g-1 (Au, Pd) and 2.5 ngg-1 (Pt) after preconcentration on a powdered chelating sorbent POLYORGS-IV. The accuracy of data was confirmed by the analysis of standard reference materials (limestone KH and black shale SChS-1). Data obtained for samples of black shales and host rocks from cross-sections of Mountain Crimea and Northern-Western Caucasus show the principal differences in accumulation conditions of sediments in these geological regions.
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