Geophysical interpretation of potential field data plays an important role in the integration of geological data. Estimation of density and magnetic susceptibility variations within the upper crust helps evaluating the continuity of geological structures in the field. In the present study we use gravity and magnetic data in NW Amazonian Craton in Colombia. Total horizontal gradient of the reduction to magnetic pole were used to delineate magnetic lineaments and domains showing four zones, each with its own features. Multiscale edge detection (worming) of the data help delineate upper crustal structures that we interpret as tectonic boundaries that correlate with the four zones identified. 3D density and magnetic susceptibility inversion showed high density and/or high magnetic susceptibility sources correlated with these crustal structures. Zone (1) is located south of the Guaviare River, with predominant NW-SE and NE-SW magnetic lineaments; zone (2), located from south of the Guaviare River to the north, present nearly E-W magnetic lineaments and a deep E-W edge interpreted as a possible shear zone parallel to Guaviare, Orinoco and Ventuari rivers; zone (3) from south of the Vichada River to the north, with NE-SW and NW-SE lineaments; N-S zone (4) cuts the zones (2) and (3), characterized by high density/magnetic susceptibility source bounded by N-S deep edges. A more complete tectonic evolution interpretation requires further work, but we speculate that the zone (4) could indicate an aborted rift/collision suture and that the zone (2) is indicative of a younger deformation event. Shear direction at (2) is not clear: geological maps show NEE-SWW right-lateral faulting, but geophysical anomalies suggest left-lateral displacement, highlighted by left dislocation of the Orinoco River. We also speculate that a N-S edge located at the SE of the area can be related with the Atabapo Belt and the limit of Ventuari-Tapajós and Rionegro geochronological provinces.

潜在野外数据的地球物理解释在地质数据整合中起着重要作用。估计上地壳内的密度和磁化率变化有助于评估野外地质结构的连续性。在本研究中，我们使用哥伦比亚西北亚马逊河克拉顿的重力和磁数据。还原到磁极的总水平梯度用于描绘显示四个区域的磁性线和磁畴，每个区域都有自己的特征。数据的多尺度边缘检测（蠕虫）有助于描绘上地壳结构，我们将其解释为与所确定的四个区域相关的构造边界。3D密度和磁化率反演显示出与这些地壳结构相关的高密度和/或高磁化率源。（1）区位于瓜维阿雷河以南，主要为NW-SE和NE-SW磁系。区（2）位于瓜维亚雷河以南至北部，目前几乎Ë-W磁性线和深的EW边缘被解释为平行于Guaviare，Orinoco和Ventuari河流的可能剪切带；从Vichada河以南到北部的（3）区域，具有NE-SW和NW-SE界线；NS区域（4）切割了区域（2）和（3），其特征是由NS深边缘界定的高密度/磁化率源。更完整的构造演化解释需要进一步的工作，但我们推测区域（4）可能表明裂谷/碰撞缝线已中止，区域（2）指示了年轻的变形事件。（2）处的剪切方向尚不明确：地质图显示NEE-SWW右侧断层，但地球物理异常表明左侧位移，奥里诺科河的左侧错位突出显示。