Abstract
The paper presents geological and petrogeochemical data on the intensely metamorphosed Early Precambrian ferruginous-silicate rocks (eulysites) in Eurasia. Normative-mineral compositions of primary eulysites are given for the first time. These rocks were likely formed from ferruginous-silicate sediments rather than ultramafic metaigneous rocks. The sedimentary origin of eulysites is suggested by their formational affiliation, banded-laminated structures, low contents of protocrystallization trace elements (Cr, Ni, Co, V) in the major rock-forming minerals (fayalite, ortho- and clinopyroxenes), and the presence of biogenic carbonaceous matter. Probably, eulysites are products of the ferruginous-silicate sediments formed under reductive conditions and subjected to granulite metamorphism.
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