Abstract
Relevance. The Ray-Iz massif contains the Tsentralnoye chromium ore deposit and is unique in terms of variety of metamorphic rock associations. It has been studied since 1932. However, some aspects of geology and petrology in the literature are not fully covered. One of these areas is a vein series of rocks localized in ultramafic rocks. The spatial confinement of amphibolites to the Central zone of metamorphism, which is consistent with the zone of distribution of deposits and ore occurrences of chromites, determines the need for a detailed study. Purpose of work. Study of mineralogical and petrographic characteristics, as well as the geochemistry of lanthanides of amphibolites of the Ray-Iz massif (Polar Urals). Results. The study of the nature of REE distribution in rock-forming minerals made it possible to determine that the variation in the amount of REE (33–75 g/t) within one rock is associated with the quantitative content of the main minerals-concentrators. The main mineral concentrator lanthanides in garnet amphibolites is garnet, while amphibole is in garnet-free pyroxene-bearing amphibolites. Based on the results of the chemical composition of amphibole and coexisting plagioclases and amphibolite garnets, the temperature was calculated using amphiboleplagioclase by T. Holland, J. Blundy, as well as the garnet amphibolite by L. L. Perchuk geothermometers and pressure based on amphibole geobarometer by M. W. Schmidt. Conclusion. The nature of the distribution of lanthanides in the main rock-forming minerals, amphibole and garnet, has been revealed. Comparison of parameters and compositional features of amphiboles made it possible to conclude that there is a direct relationship between temperature, pressure, the sum of REE and TiO2 , as well as (La/Yb)n , in the mineral.
Highlights
The Ray-Iz ultramafic massif forms the northern end of the Main ultramafic belt of the Urals and is one of the largest massifs in the Urals [1]
Some aspects of geology and petrology in the literature are not fully covered. One of these areas is a vein series of rocks localized in ultramafic rocks
The spatial confinement of amphibolites to the Central zone of metamorphism, which is consistent with the zone of distribution of deposits and ore occurrences of chromites, determines the need for a detailed study
Summary
The Ray-Iz ultramafic massif forms the northern end of the Main ultramafic belt of the Urals and is one of the largest massifs in the Urals [1]. The massif contains the Tsentralnoye chromium ore deposit and is unique in terms of the variety of rock metamorphic associations. It has been studied since 1932 [2]. Some aspects of geology and petrology are not fully covered in the literature One of these areas is a vein series of rocks localized in ultramafic rocks. Amphibolites, along with sagvandites and enstatite-olivine rocks, compose the so-called Central Metamorphism Zone (CMZ) of the Ray-Iz massif, which stretches in a sublatitudinal direction along the Levaya Makar-Ruz river to the head of the Enga-Yu river [8]; amphibolites are exposed in the walls of cirques on the left bank of the Levaya Makar-Ruz river. It is assumed that CMZ coincides with the zone of deep fault, delimiting the area of maximum uplift of “basalts” from the Precambrian basement [4]
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