Monzonites in Ilmenogorsky alkaline complex of the Urals

The data on presence of monzonites in world famous Ilmenogorsky alkaline complex are absent in the literature. The paper informes on the first find of such rocks in Ilmeny Mountains (northwest coast of Lake Bolshoje Miassovo, pit 287 of Ilmeny State Reserve (N - 50є10'18.0'', E - 60є15'57.9''). This outcrop is outside of miaskite massif and settles down in a tract of blastomylonites which develops on the rocks of gneissic-amphibolite Ilmenogorsky sequence and granitoid dikes. Biotite quartz monzonites compose of a dike of 280 cm thickness, dissecting the block of coarse-grained calcite-dolomite carbonatites. Chemical and minerals composing monzonites, the petrographic description them are outlined

The sapphirine-spinel hornblendites of Il’meno-Vishnevogorsky complex

The authors consolidated disparate information about sapphirine-bearing rocks of the Urals. It is shown that they belong to genetically different entities. There are the intrusive rocks (hornblendites, gabbros), bodies of eclogites and eclogite-lyke rocks, high-metamorphizied Paleozoic bauxite (emery rocks). Given the most complete petrographic and mineralogical characteristics the corundum-bearing sapphirine-spinel hornblendites which compose clastolithe blocks in lenses of serpentinite melange among Kyshtim suite gneisses of the Il’meno-Vishnevogorsky complex. For the first time the data of X-ray, Mössbauer and Infrared spectroscopy of sapphirine from the hornblendites, chemical compositions of most minerals in the rocks are given. The conclusion about the magmatic origin of the sapphirine-spinel hornblendites of the Urals is made