Niobium ore genesis in a capsule

Geology Pub Date : 2024-04-25 DOI:10.1130/g52169.1
A. Williams-Jones, O. Vasyukova, A.V. Kostyuk
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Abstract

Experiments were conducted to test the hypothesis that carbonatite-hosted Nb deposits owe their origin to the metasomatic alteration of K-feldspar-rich fenite by carbonatitic magma. This involved reacting K-feldspar with a synthetic mixture of CaCO3, MgCO3, Mg(OH)2, CaF2, and Nb2O5. At the experimental conditions, a phlogopite-rich calcite-bearing metasomatic rind containing pyrochlore formed on the K-feldspar. This supports the above hypothesis and also explains the origin of fenite-associated glimmerite, the association of glimmerite with calcite carbonatite, and the genesis of the carbonatite-hosted ores that supply the bulk of the world’s niobium.
胶囊中的铌矿石成因
为了验证碳酸盐岩托举铌矿床的成因是碳酸盐岩岩浆对富含钾长石的栅长岩的变质这一假设,我们进行了实验。这包括将 K 长石与 CaCO3、MgCO3、Mg(OH)2、CaF2 和 Nb2O5 的合成混合物进行反应。在实验条件下,钾长石上形成了富含方解石的辉绿岩变质表皮,其中含有火成岩。这支持了上述假设,同时也解释了栅栏岩相关萤石的起源、萤石与方解石碳酸盐岩的关联,以及提供全球大部分铌的碳酸盐岩矿的成因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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