Summary
Geochemical typification of basic dykes of the Ingul and Volyn domains of the Ukrainian Shield
Mytrokhyn O.V.¹, Shumlyanskyy L.V.², Vishnevskaya E.A.³, Omelchenko A.M.¹, Mitrokhina T.V.¹
1 – Taras Shevchenko National University of Kyiv, Institute of Geology
2 – M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
3 – State Enterprise «Kirovgeologiya»
Language: Russian
Geochemistry and ore formation 2017, 38: 50-57
https://doi.org/10.15407/gof.2017.38.050
The chemical composition of non-metamorphosed basic dykes within the Ingul (ID) and Volyn (VD) domains have been studied with the purpose of clarification of possibility of geochemical classification and correlation of the dyke rocks of the Ukrainian Shield. For this purpose, all available chemical analyzes of the dyke rocks from ID and VD were used, including those published in the literature and original analyses performed on the author’s samples. The initial list of samples included 325 analyses on mayor oxides produced in different years by the «wet» chemistry and XRF methods. The content of volatile components (CVC), determined as a sum of H2O+, CO2, SO2, F , Cl and LOI was used to reject altered rocks, the chemical composition of which could undergo significant modification under influence of the low-temperature hydrothermal-metasomatic processes. It was established previously that in the least altered rocks the CVC does not exceed 2 %, whereas in moderately altered dykes it is 2–4 %, and in intensively altered rocks the CVC varies in the range of 4–18 %. The samples having the CVC in excess of 4 % and dykes that were presumably affected by silicification were excluded from the further consideration. The final set of samples included 40 analyses of the ID dykes and 171 analyses of the VD dykes. To clarify the distribution of microelements we used ICP-MS analyses most of which were carried out by authors. It has been shown that dykes in both domains belong to the tholeiitic and subalkaline petrogenetic series. The similarity of geochemical variations of dyke composition in two spatially separated domains of the Ukrainian Shield evidences about the similarity of processes of magmatic evolution. Revealed peculiarities of the chemical composition can be used as indicators for classification and correlation of dyke formations in the Ukrainian Shield.
Key words: geochemistry, basic dykes, the Ukrainian Shield.
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