Advanced magnetic and gravity data analysis has been used to acquire geophysical constraints providing new insights into the geological structure of the Suwałki Anorthosite Massif (SAM). The large negative magnetic anomaly of the SAM anorthosite intrusion is a result of the negative inclination of remanent magnetization, directed antiparallel to the present Earth’s magnetic field. Several filtering processes were applied to the magnetic and gravity maps to better understand the subsurface geology of the SAM area. The geological analysis of residual magnetic and gravity anomaly maps reveals the presence of different rock units, reflecting variation in petrological composition of the crystalline basement rocks. The 2-D modelling of magnetic and gravity data delineate the location and extent of the anorthosite-norite massif. The data is consistent with a thick upper crustal body with density 2690 kg/m3, low susceptibility (0.005 SI) and natural remanent magnetization (1.95 A/m), having inclination of I = –68°, and declination of D = –177°. The rocks bordering the central anorthosite body consist of norite and gabbronorite, granodiorite, diorite and charnockite. These main crystalline basement crustal units are shown more precisely on a new geological map of the SAM.

先进的磁和重力数据分析已用于获取地球物理约束条件，从而提供了有关SuwałkiAnorthosite地块（SAM）地质结构的新见识。SAM异铁矿侵入的较大的负磁异常是剩余磁化强度的负倾角的结果，它与当前的地球磁场反平行。对磁图和重力图应用了几种滤波过程，以更好地了解SAM地区的地下地质。残余磁异常图和重力异常图的地质分析揭示了不同岩石单元的存在，反映了结晶基底岩石岩石学组成的变化。磁性和重力数据的二维建模描述了钙长铁-norite地块的位置和范围。该数据与上地壳厚，密度2690 kg / m3，低磁化率（0.005 SI）和自然剩余磁化强度（1.95 A / m），倾角I = –68°，倾角D = –177相一致。 °。与中心无钙铁矿体接壤的岩石由红土和辉长岩，花岗闪长岩，闪长岩和霞灰岩组成。这些主要的晶体基底地壳单元在SAM的新地质图上更精确地显示。