The Santa Lucía River Basin Trough is located in the southern sector of the Eastern Republic of Uruguay and has an area of almost 6,000 km². In this work, the depth to the basement in the SW sector of the Santa Lucia Basin (SLB) was determined, using geophysical methods of exploration. The interest of exploring this geological basin is to determine its depth, recognizing the possible existence of deep aquifers, and the feasibility of hydrothermalism. For this reason were acquired, processed, inverted, and interpreted 10 magnetotelluric (MT) soundings. A 3D inversion based on the ModEM code was performed, and a 2D inversion (NLCG) of the invariant determinant along a profile that crosses the study area was carried out; their comparison yields similar resistivity and structural models results. The resistivity modeling was complemented with a Bouguer anomaly map created from a gravimetric database of 157 stations. Our geophysical results indicate that the Santa Lucia trough deepens toward the E-NE, reaching sedimentary thicknesses that may exceed 950 m. Outside the studied sector, its depth increases according to the gravity minimum, toward the NE of the area. Therefore, sandy or deep fractured episodes could harbor hot springs, whose temperature, considering the normal geothermal gradient of 30 °C/km, would approximately be in the range of 36–40 °C.

圣卢西亚河流域海槽位于乌拉圭东部共和国南部，面积近 6,000 平方公里². 在这项工作中，使用地球物理勘探方法确定了圣卢西亚盆地 (SLB) 西南部分的地下室深度。探索这个地质盆地的兴趣在于确定其深度，认识到可能存在深层含水层，以及热液作用的可行性。为此，我们采集、处理、反演和解释了 10 次大地电磁 (MT) 测深。进行了基于 ModEM 代码的 3D 反演，并沿横穿研究区的剖面进行了不变行列式的 2D 反演 (NLCG)；他们的比较产生了类似的电阻率和结构模型结果。电阻率建模与从 157 个站点的重力数据库创建的布格异常图相辅相成。我们的地球物理结果表明圣卢西亚海槽向 E-NE 方向加深，沉积厚度可能超过 950 m。在研究扇区之外，其深度根据重力最小值向该区域的 NE 方向增加。因此，沙质或深裂缝事件可能含有温泉，考虑到正常地温梯度 30°C/km，其温度将大约在 36-40°C 的范围内。