Geologicheskii Vestnik

Ultramafi c ore-bearing stocks corresponds to the most primitive magmas of the Khudolaz diff erentiated complex. These include the Malyutka massif that acquired geochemical characteristics in this work. The massif is located in the tectonized tuff aceous sandstones of the Zilair Formation and is considered to be an apophysis, separated by faults from the cumulus horizon of a hypothetical large magmatic body lying at the base of the Khudolaz trough (West Magnitogorsk zone). Sm-Nd and Rb-Sr isotope data of rocks (ISr(T) = –2.03…–4.73, εNd(T) = +8.1…+9.1) testify in favor of insignifi cant crustal contamination of the parental magma. The parental magma source could have been mantle PREMA-type.

Khudolaz complex, Malyutka massif, geology, geochemistry, Rb-Sr – Sm-Nd isotop system, mantle source

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