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Exotic amphibolites of the Ilmeny mountains (South Urals): Composition and geologic setting

In this paper, we report the chemical composition and contents of REE, Cr, and Ni of amphibolites making up olistoliths in aposedimentary matrix and exotic blocks in metaul-trabasic rocks. The latter are large fragments of ancient metamorphosed serpentinite melange, which form chaotic accumulations (olistostrome) in the Riphean-Vendian quartzite-schist strata of the Ilmeny complex in the Urals. The amphibolites are extremely depleted in SiO2 (<40-45%), rich in Al2O3 (>17-22%) and CaO (9-20%), and have noticeable amounts of alkalies (Na2O = 0.6-2%, K2O = 0.1-0.7%) and extremely high contents of SrO in the hosted plagioclases. In these features the amphibolites have no chemical analogs among the known igneous rocks. Moreover, they bear finest zircon grains and have abnormally high contents of REE (ZREE = 40-1246 ppm) and elevated contents of Ni

Библиографическая ссылка: Korinevsky V.G., Korinevsky E.V. Exotic amphibolites of the Ilmeny mountains (South Urals): Composition and geologic setting // Russian Geology and Geophysics. 2004. Т. 45. № 9. P. 1114-1127.