Abstract—

A review of the data available on the composition and abundance of titanium-bearing phases in the Earth’s mantle is provided in the paper. The main attention is paid to the discussion of natural minerals: the patterns of the mineralogy of mantle titanium-bearing phases (rutile, FeTiO₃ ilmenite, garnet, pyroxene, spinel and post-spinel phases, phases with ilmenite- and perovskite-type structures, armalcolite) are given, the likely mechanisms of titanium incorporation into mantle phases, as well as the limiting titanium concentrations in these phases are considered. The new experimental data on the composition and conditions of the formation of titanium-bearing minerals and their phase associations at different mantle depths is generalized: phase relations in Ti-bearing systems (MgO–SiO₂–TiO₂ ± Al₂O₃) and the influence of titanium on the parameters of the most important phase transformations under the conditions of the mantle are considered. Agreement of the experimental results with the natural data allows us to clarify the patterns of the interphase titanium partitioning and the minor-element composition of the Earth’s deep geospheres.

中文翻译：

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地幔中的钛矿物及其组合：自然和实验数据回顾

摘要-

该论文综述了有关地幔中含钛相的组成和丰度的可用数据。主要关注天然矿物的讨论：地幔含钛相（金红石、FeTiO ₃钛铁矿、石榴石、辉石、尖晶石和后尖晶石相，具有钛铁矿和钙钛矿型结构的相）的矿物学模式, armalcolite)，考虑了钛掺入地幔相的可能机制，以及这些相中的限制钛浓度。关于不同地幔深度含钛矿物的组成和形成条件及其相组合的新实验数据概括：含钛系统中的相关系（MgO-SiO ₂–TiO ₂ ± Al ₂ O ₃ ) 以及钛对地幔条件下最重要相变参数的影响。实验结果与自然数据的一致性使我们能够阐明相间钛分配的模式和地球深层地圈的微量元素组成。