Wakefieldite-(Ce,La) and vanadinite in coarse-grained calciocarbonatites (sövites) are for the first time reported from the northeastern part of the worldwide largest fluorite deposit at the Amba Dongar carbonatite ring dike, India. Sövite in this part of the carbonatite ring dike is rich in pyrochlore, calcite and magnetite. Pyrochlore makes up almost 50% of some sövite samples and shows core-to-rim compositional changes. The core of pyrochlore consists of primary fluorcalciopyrochlore with high F and Na contents while the margins gained elevated amounts of Pb, La and Ce with the associated loss of F and Na due to circulation of hydrothermal solutions. The presence of wakefieldite-(Ce,La) and vanadinite points to an exceptionally high V abundance in hydrothermal solutions formed towards the end of the carbonatite magma activity. This investigation thus opens new promising areas for Nb and REE prospection in the eastern part of the Amba Dongar carbonatite body.

在印度Amba Dongar碳酸盐岩环形堤坝上，全球最大的萤石矿床的东北部首次报道了粗粒钙碳酸盐岩（sövites）中的Wakefieldite-（Ce，La）和钒铁矿。在碳酸盐环堤的这一部分中的白钨矿富含烧绿石，方解石和磁铁矿。烧绿石约占部分白云母样品的50％，并显示了核到边的组成变化。烧绿石的核心由氟和烧碱含量较高的氟代次氯烧组成，而边际区由于水热溶液的循环而获得了较高的Pb，La和Ce含量，同时伴随着F和Na的损失。尾矿质-（Ce，La）和钒铁矿的存在表明，在碳酸盐岩浆活动结束时形成的热液中存在极高的V丰度。