UDC 552.321.6+552.48/45(477.64)
Kravchenko G.L.
Language: Russian
Geochemistry and ore formation 2014, 34 : 34-49
https://doi.org/10.15407/gof.2014.34.034
Metamorphic ultrabasites and basites as well as their host-rock garnet-two-pyroxenе-amphibolе-magnetite quartzites, garnet-biotite of the Orlovska magnetic anomaly and other gneiss of the Central-Azov series (AR3) are characterized. Magmatogene ultrabasites are presented by high magnesian and low aluminiferous and enriched in Ca olivine orthopyroxenites of Na and K-Na series. These rocks belong to basic plutonic varieties of the normal petrochemical series of pyroxenite-horblendite family (basic ultramafites). It is shown that crystallization of olivine pyroxenites was went on T = 1012–1060 ºС. Based on chemistry of rockforming minerals and rocks and rare elements distribution, it was established that these rocks were metamorphosed under granulitic facies conditions of progressive regional metamorphism at T ~ 700 ºС and Ptot. = (5–7)´108 Pа. At the regressive stage of regional metamorphism under amphibolitic and epidote-amphibolite facies conditions these rocks was undergone by metamorphic hydration at the decreasing of metamorphic conditions (first at all reduction of temperature up to 550–600 ºС).
Key words: ultrabasite, quartzite, metamorphism, facies, temperature.
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