Abstract

This paper reports the results of the first study of pyroxenes from the deepest zones of the Lovozero deposit. The geochemical and mineralogical study of these rocks is of great scientific interest, as they are the least differentiated rocks and provide insight into the composition of a parental magma. According to microprobe analysis, clinopyroxenes evolve from early diopside–hedenbergite–augite to later alkaline aegirine–augite species. Upsection, the contents of Na, Fe³⁺ and Ti increase, while Mg, Ca, Fe²⁺, and Zr decrease. Thus, isomorphic substitution in pyroxenes of the lower zone follows the scheme (Ca, Mg, Fe²⁺, Zr) → (Na, Fe³⁺, Ti).

中文翻译：

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Lovozero稀有金属矿床（下部）的辉石的演化

摘要

本文报道了从洛沃零矿床最深区域对辉石的首次研究结果。这些岩石的地球化学和矿物学研究具有极大的科学意义，因为它们是分化程度最低的岩石，可提供对父母岩浆成分的洞察力。根据微探针分析，斜辉石从早期的透辉石-变长方石-辉长石演变为后来的碱性aegirine-的直辉石种。上部，Na，Fe ³⁺和Ti的含量增加，而Mg，Ca，Fe ²⁺和Zr的含量减少。因此，下部区域的辉石中的同构取代遵循方案（Ca，Mg，Fe 2 ⁺，Zr）→（Na，Fe ³⁺，Ti）。