The exceptional accumulation of perovskite in the alkaline-ultramafic Afrikanda complex (Kola Peninsula, Russia) led to the study of polymineralic inclusions hosted in perovskite and magnetite to understand the development of the perovskite-rich zones in the olivinites, clinopyroxenites and silicocarbonatites. The abundance of inclusions varies across the three perovskite textures, with numerous inclusions hosted in the fine-grained equigranular perovskite, fewer inclusions in the coarse-grained interlocked perovskite and rare inclusions in the massive perovskite. A variety of silicate, carbonate, sulphide, phosphate and oxide phases are assembled randomly and in variable proportions in the inclusions. Our observations reveal that the inclusions are not bona fide melt inclusions. We propose that the inclusions represent material trapped during subsolidus sintering of magmatic perovskite. The continuation of the sintering process resulted in the coarsening of inclusion-rich subhedral perovskite into inclusion-poor anhedral and massive perovskite. These findings advocate the importance of inclusion studies for interpreting the origin of oxide minerals and their associated economic deposits and suggest that the formation of large scale accumulations of minerals in other oxide deposits may be a result of annealing of individual disseminated grains.

中文翻译：

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Afrikanda 碱性-超镁铁复合体氧化物矿物中的多矿物包裹体：对钙钛矿矿化演化的影响

钙钛矿在碱性-超镁铁质 Afrikanda 复合体（俄罗斯科拉半岛）中的异常积累导致了对钙钛矿和磁铁矿中的多矿物包裹体的研究，以了解橄榄石、斜辉石和硅碳酸盐中富含钙钛矿的区域的发展。三种钙钛矿结构中夹杂物的丰度各不相同，细粒等粒钙钛矿中夹杂物较多，粗晶互锁钙钛矿中夹杂物较少，块状钙钛矿中夹杂物较少。各种硅酸盐、碳酸盐、硫化物、磷酸盐和氧化物相在夹杂物中以不同比例随机组合。我们的观察表明，夹杂物不是真正的熔体夹杂物。我们认为夹杂物代表在岩浆钙钛矿亚固相线烧结过程中捕获的材料。烧结过程的继续导致富含夹杂物的亚自面体钙钛矿粗化为缺乏夹杂物的正面体和块状钙钛矿。这些发现主张包裹体研究对于解释氧化物矿物及其相关经济矿床的起源的重要性，并表明其他氧化物矿床中矿物的大规模堆积可能是单个散布颗粒退火的结果。