Geothermal gradients were estimated at the points of a grid with cell size of 50 km by 50 km in northwestern Colombia. Depths to the bottom of magnetic sources were assumed to represent Curie depths, and were estimated by means of statistical-spectral analysis of aeromagnetic data contained in square windows of 100 km by 100 km, 200 km by 200 km, and 300 km by 300 km. The centroid method and a variation of it that considers the fractal distribution of magnetization were applied. The modified centroid method provided better estimations of Curie depths, which range between 13 km and 47 km. Obtained Curie depths are comparable to those reported in other studies of regional character. The corresponding estimated geothermal gradients correlate quite well with estimations based on the bottom simulating reflector and bottom hole temperatures. Observed differences are small and can be accounted for by local heat flow variations due to shallow ground water flow, or recent sedimentation. Elaborated geothermal gradient and heat flow maps for northwestern Colombia are accurate and consistent with estimates of the thickness of the oceanic crust and continental cortical thicknesses, reported by previous authors. The maps presented in this study represent a contribution to the heat flow studies in northwestern South America.

中文翻译：

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哥伦比亚加勒比海（南美西北部）的居里点深度，热梯度和热流

在哥伦比亚西北部，一个单元大小为50 km x 50 km的网格点估计了地热梯度。假定到磁源底部的深度代表居里深度，并通过对100 km x 100 km，200 km x 200 km和300 km x 300 km方形窗口中包含的航空磁数据的统计光谱分析进行估算。质心方法及其变型考虑了磁化的分形分布。改进的质心方法可以更好地估计居里深度，范围在13 km至47 km之间。获得的居里深度可与其他有关区域性研究的报道相媲美。相应的估算地热梯度与基于底部模拟反射器和井底温度的估算具有很好的相关性。观测到的差异很小，可以归因于浅层地下水流或近期沉积引起的局部热流变化。先前作者报道，哥伦比亚西北部精心制作的地热梯度和热流图是准确的，并且与洋壳厚度和大陆皮层厚度的估计值一致。本研究中提供的地图代表了对南美西北部热流研究的贡献。