加拿大麦吉尔大学A.E. Williams-Jones等人报道了铌矿成因。相关论文于2024年4月25日发表于国际顶尖学术期刊《地质学》杂志上。

研究人员通过实验验证了碳酸盐岩含铌矿床的成因，是碳酸盐岩岩浆对富钾长石白云石的交代蚀变。这涉及到钾长石与CaCO₃、MgCO₃、Mg(OH)₂、CaF₂和Nb₂O₅的合成混合物反应。在实验条件下，钾长石上形成了富辉云母、含方解石、含焦绿石的交代壳。

这支持了上述假设，也解释了与白云石相关的闪辉石的起源，闪辉石与方解石碳酸盐的联系，以及提供世界上大部分铌的碳酸盐矿石的起源。

附：英文原文

Title: Niobium ore genesis in a capsule

Author: A.E. Williams-Jones, O.V. Vasyukova, A.V. Kostyuk

Issue&Volume: 2024-04-25

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.

DOI: 10.1130/G52169.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52169.1/638853/Niobium-ore-genesis-in-a-capsuleredirectedFrom=fulltext