Abstract
The paper studies accessory Cr-spinels from deep drill holes crossing the Nude-Poaz massif, which is a part of the Monchegorsk mafic-ultramafic layered complex (2.5 Ga, Kola Peninsula, Russia). Cr-spinels occur as two morphological types that differ in their chemical composition, i.e., Cr-spinels of the first type are more aluminous, while Cr-spinels of the second type are more ferruginous and titaniferous. Cr-spinels of the Nude-Poaz massif are characterized by a Fe-Ti trend known for layered intrusions in the world. Cr-spinels of the Nude-Poaz massif quite clearly differ in composition from chromites of the Sopcheozero deposit: they are more ferruginous and less chromous. The specific composition of Cr-spinels in rocks of the Nude-Poaz massif can be correlated with the sequence of the magmatic phases intrusion.
Highlights
Minerals 2021, 11, 602. https://Chromite occurs in various forms, like a number of other minerals concentrating commercially valued metals
The study of Cr-spinel composition correlated with varied pressure and temperature (PT) parameters provided the basis for modeling magmatic processes
We have studied Cr-spinels from a norite sequence in the Nude-Poaz massif
Summary
Chromite occurs in various forms, like a number of other minerals concentrating commercially valued metals. It is mainly associated with ultramafic rock massifs, where chromite can be observed as disseminated or individual bodies (beds and lenses) with some of them producing major deposits. Cr-spinels are considered a clue to understanding the evolutionary processes of magmatic melts [1,2]. The study of Cr-spinel composition correlated with varied pressure and temperature (PT) parameters provided the basis for modeling magmatic processes. The mentioned authors have been successfully working at such modeling as well [3,8]
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