Accessory Cr-Spinels in the Section of the Nude-Poaz Massif in the Monchegorsk (2.5 Ga) Mafic-Ultramafic Layered Complex (Kola Peninsula, Russia): Comparison with Ore-Forming Chromites

The paper studies accessory Cr-spinels from deep drill holes crossing the Nude-Poaz massif, which is a part of Monchegorsk mafic-ultramafic layered complex (2.5 Ga, Kola Peninsula, Russia). occur as two morphological types that differ in their chemical composition, i.e., first type are more aluminous, while second ferruginous and titaniferous. massif characterized by Fe-Ti trend known for intrusions world. quite clearly composition chromites Sopcheozero deposit: they less chromous. specific rocks can be correlated with sequence magmatic phases intrusion.