On the issue of potential primary sources of diamonds in the Urals

The article provides a brief description of the newly identified Akhtyl basanite-analcimite complex, as well as the Sertynya lamproite and Sylva fluidolite diamond-containing complexes, which are confined to the submeridional rift structures of the western and eastern borders of the Uralian orogeny. The author conducted a mineralogical and petrographic study of diamond-bearing alkalibasite rocks identified as lamproites, kersantites, analcimites, basanites, and fluidolites. He demonstrates their probable fluid-magmatic genesis, as indicated by both structural, textural and mineralogical features, including accessory minerals that indicate diamond potential, as well as the presence of drop-shaped elliptical segregations of volcanic glass, the pulp-like finely dispersed nature of the groundmass, and unsorted weakly rounded to sharply angular fragments of igneous and sedimentary rocks. The data obtained indicate the probable manifestation of alkali-basite and phreatic volcanism, which led to the transportation of diamonds and their satellites by fluidolites and lamproites to a weakened rift zone in the post-collisional subcontinental environment of the Early Mesozoic.

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