Geological and geophysical data are used to model the 3D geometry of the Tajno alkaline massif intruded during the Early Carboniferous in NE Poland. The massif consists mainly of pyroxenite, mafic intrusive and volcanic rocks, and carbonatites containing rare earth elements (REE) and other important mineral resources. The deep structure of the massif, and its thickness, shape and internal structure, has been poorly known making it impossible to properly search for useful mineral resources. In order to better constrain the distribution, geometries and relationships between the main rock types, a 3D geological model of the Tajno massif has been developed. The input data comprise a set of geological cross-sections built on an updated subsurface geological map, and borehole, magnetic and gravity data. 3D Geomodeller software was applied to integrate geological data into a coherent and geologically feasible model of the massif using geostatistical analysis. The magnetic and gravity data were used to constrain the 3D geological modelling results. The final 3D model is thus compatible with the geological data, as well as with geophysical data. The most important conclusions obtained from the modelling are as follows: (i) a higher proportion of nepheline syenites or tuffs and pyroclastic breccia in relation to pyroxenites; and, (ii) a smaller proportion of chimney breccia relative to chimney-hosted tuffs and volcanic breccia than proposed in previous geological interpretation. These results are important for further studies on the evolution of the Tajno massif and its associated carbonatites.

地质和地球物理数据用于模拟在波兰东北部早石炭世侵入的 Tajno 碱性地块的 3D 几何形状。该地块主要由辉石岩、镁铁质侵入岩和火山岩以及含有稀土元素（REE）的碳酸盐岩和其他重要矿产资源组成。地块的深层结构及其厚度、形状和内部结构鲜为人知，因此无法正确寻找有用的矿产资源。为了更好地约束主要岩石类型之间的分布、几何形状和关系，开发了 Tajno 地块的 3D 地质模型。输入数据包括建立在更新的地下地质图上的一组地质横截面，以及钻孔、磁力和重力数据。3D几何建模器应用软件通过地质统计分析将地质数据整合到地块的连贯且地质上可行的模型中。磁力和重力数据用于约束 3D 地质建模结果。因此，最终的 3D 模型与地质数据以及地球物理数据兼容。从建模中获得的最重要结论如下： (i) 霞石正长岩或凝灰岩和火山碎屑角砾岩的比例高于辉石岩；(ii) 相对于烟囱凝灰岩和火山角砾岩而言，烟囱角砾岩的比例比先前地质解释中提出的要小。这些结果对于进一步研究 Tajno 地块及其伴生碳酸盐岩的演化具有重要意义。