Geochemical characteristics of agate bearing basalts of the Central Kuzbass (Kemerovo region)

In this paper are results of study the rocks of Permian-Triassic volcano-plutonic province of central Kuzbass. The studied rocks are classified as traps and associated with them outcrops and deposits of Iceland spar and agates. The aim of the proposed work is to discuss the geochemical features of agate-bearing basalts. It is important to trace how the content of impurity elements in each of the samples of different deposits varies, to note significant variations in the concentrations of individual elements. Taking into account the identified features, compare the data of samples of the central Kuzbass relative to each other. Stone material was selected from the deposits of the site Tersyuk and Saltymakovsky ridge. Deposits are localized in the so-called “Melaphyro horseshoe”, which is expressed geomorpho-logically in the form of the Karakan, Saltymakovsky, Ajendarovsky ridges, Ostashki Kamen, the Kaylot mountains and the Taradanovsky ridge. The results of the study showed that the geochemical parameters of the samples of different deposits are similar, but there are slight differences. In the Tersyuk samples, the content of Cr, Co, Mn, V is higher relative to basalt samples of the Saltymakovskiy ridge. Also, it was noted earlier that samples of agate from deposit to deposit have clearer differences than samples of host rock. All samples are characterized by the predominance of light lanthanides over heavy ones. Our data show a correlation with data from earlier studies by other authors. The enrichment of large-ionic lithophilic elements and the depletion of heavy lanthanides, which may indicate the presence of garnet in parental melts, had been established. In basalts, a high content of vanadium is observed, which is noted for the rocks of the trap formation of Siberia. All samples fall into the field of within-plate basalt, to the border with basalts of volcanic arcs. Also, it is noted that agate samples from deposits to deposits have more distinct differences than the samples of the host rock. By the Ti-Zr ratio, the Kuzbass basalts are close to the basalts of the Syverminsky suite of Siberian traps, which may be a consequence of a single mantle source.

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