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首页> 外文期刊>Contributions to Mineralogy and Petrology >Textural evolution of perovskite in the Afrikanda alkaline-ultramafic complex, Kola Peninsula, Russia
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Textural evolution of perovskite in the Afrikanda alkaline-ultramafic complex, Kola Peninsula, Russia

机译：普罗维达碱 - 超越复合物，俄罗斯康拉半岛的植物普罗夫斯基钛矿的构造演变

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Perovskite is a common accessory mineral in a variety of mafic and ultramafic rocks, but perovskite deposits are rare and studies of perovskite ore deposits are correspondingly scarce. Perovskite is a key rock-forming mineral and reaches exceptionally high concentrations in olivinites, diverse clinopyroxenites and silicocarbonatites in the Afrikanda alkaline-ultramafic complex (Kola Peninsula, NW Russia). Across these lithologies, we classify perovskite into three types (T1-T3) based on crystal morphology, inclusion abundance, composition, and zonation. Perovskite in olivinites and some clinopyroxenites is represented by fine-grained, equigranular, monomineralic clusters and networks (T1). In contrast, perovskite in other clinopyroxenites and some silicocarbonatites has fine- to coarse-grained interlocked (T2) and massive (T3) textures. Electron backscatter diffraction reveals that some T1 and T2 perovskite grains in the olivinites and clinopyroxenites are composed of multiple subgrains and may represent stages of crystal rotation, coalescence and amalgamation. We propose that in the olivinites and clinopyroxenites, these processes result in the transformation of clusters and networks of fine-grained perovskite crystals (T1) to mosaics of more coarse-grained (T2) and massive perovskite (T3). This interpretation suggests that sub-solidus processes can lead to the development of coarse-grained and massive perovskite. A combination of characteristic features identified in the Afrikanda perovskite (equigranular crystal mosaics, interlocked irregular-shaped grains, and massive zones) is observed in other oxide ore deposits, particularly in layered intrusions of chromitites and intrusion-hosted magnetite deposits and suggests that the same amalgamation processes may be responsible for some of the coarse-grained and massive textures observed in oxide deposits worldwide.
机译：Perovskite是各种镁铁质和超岩石岩石的普通配件矿物质，但钙钛矿沉积物是罕见的，钙钛矿矿床的研究相应地稀缺。 Perovskite是一个关键的岩石形成矿物质，在Afrikanda碱性 - 超空白复合物（Kola Peninsula，NW俄罗斯）中，在橄榄石，多样化的Clinopyroxenites和硅灰石中达到特殊的高浓度。在这些岩性上，我们基于晶体形态，包容丰度，组成和区分，将Perovskite分为三种类型（T1-T3）。在橄榄石和一些临床中的钙钛矿由细粒度，围绕的单体簇和网络（T1）表示。相反，在其他Clossopoceoceites和一些硅藻土中的Perovskite具有细至粗粒的互锁（T2）和大规模（T3）纹理。电子反向散射衍射表明，橄榄石和临床中的一些T1和T2钙钛矿颗粒由多种子中征组成，并且可以代表晶体旋转，聚结和搅拌的阶段。我们提出在橄榄石和临床上，这些过程导致细菌钙钛矿晶体（T1）的簇和网络转化为更粗糙粒子（T2）和大规模钙钛矿（T3）的马赛克。这种解释表明，亚固体过程可以导致粗粒和巨大的钙钛矿的发展。在其他氧化物矿床中观察到Afrikanda Perovskite（偶晶晶体马赛克，互锁的不规则形状的晶粒和大麦）中鉴定的特征特征的组合，特别是在铬酸盐和入侵托管磁铁矿沉积物的层状侵入中，并提出了相同的侵入性合并过程可能负责在全球氧化物沉积物中观察到的一些粗粒和巨大的纹理。

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