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New data on kimberlite and lamproite magmatism in diamondiferous areas in the Western Urals

Rare potassic alkaline-ultrabasic rocks were first studied in the western slope of the Middle Urals (Perm Region) in the multiphase Blagodatsky Massif. They are represented by olivine-sanidine lamproite and kimberlite. Based on materials of bore-hole sections of up to ∼ 500 m deep and trenches (∼ 3.5 m x 2 km), it was identified that thin alkaline-ultrabasic rock bodies consist of pipe-like, vein and dyke intrusions. Alkaline-ultrabasic rocks are associated in the massive with PZ2 essexite-dolerite, trachydolerite and V2 trachybasalt. Rock contacts between one another and with terrigenous rocks (V2) and sandstone (D1) are tectonic or intrusive.