Gazeev V.M., Gurbanov A.G., Goltsman Yu. V., OleiynikovaT.I., Enna N.L., Pismennyi A.I. Fiagdonskiy effusive-cillian complex (Northern Osetija-Alanija Republic, Russia): geochemistry, geodynamic situation of forming, the problems of ore content.
The rocks of fiagdonskiy effusive-cillian complex are represented by volcanites of basic and ultrabasic composition and the most widespread and represent in Northern Osetiya (upper valley of Zaramagdon, Archondon, Fiagdon, Midagrasbindon rivers).The rocks of this complex was originated on the Early-Alpine stage of the Great Caucasus forming.
The firstly obtained isotope-geochemical data, allows to specify the sources of melts and geodynamics situation in the course of origin of fiagdon complex (FC) rocks are reported in this article. Geological age of the FC volcanites according faunistic remnants into country-rocks of tseklaurskaya suite is correspond to Sinemurian – Lower Pliensbachian [6].. According 40Ar/39Ar age dating of plagioclase from the tholeiitic basalt the tolerant plateau with age 196±4 Ma, corresponding to Pliensbachian time was obtained [27].
According chemical composition the main varieties of the FC rocks are correspond to basalt and gabbro of the normal alkalinity and are belong to soda series (Na2O⁄K2O>4), in degree of aluminiferous – to the temperate of aluminiferous rocks (аl1 is vary from 0.8 up to 0.98).
On the diagnostic diagrams the rocks of FC are concentrated in the fields of normal basalts of MORB, marginal sea or in zone of overlapping fields basalts MORB and IAT – ensymatical island arc. Comparison of multielement spectrums and spectrums of distribution of REE with N-MORB standart shown, that rocks of FC are enriched by coarse-ionic lithophilic elements with notice deficit of heavy REE and highcharging elements - Nb, Hf, Ti, P. Similarly peculiarities of the rare elements composition in the rocks are indicate on its closeness to tholeiitic basalt of the back arc basins, which are intermediate between МОRВ and IAT.
According of 87Sr/86Sr value they are correlate with basats of ensymatical island arc and marginal sea. Geodynamic condition of origin of basite-ultrabasitic FC and associated deep-sea sediments correspond as a suprasubduction zone ophiolites. < br/>< br/>
Keywords: the Great Caucasus, volcanic products, basic volcanism manifestations, K-Ar and 40 Ar/39 Ar age dating, classification diagram, isotope-geochemical data.
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