On the boundaries of the states of Coahuila and Zacatecas in northern Mexico, scarce outcrops of a Triassic subduction complex have been used to infer in several positions a tectonostratigraphic terranes boundary. This crustal boundary is covered by a pile of Jurassic volcanosedimentary rocks and a thick, folded, and thrusted Mesozoic sedimentary marine succession. We carried out detailed mapping, geological cross-sections, and a geophysical survey using magnetic and gravity data to model the buried boundary between these crustal blocks. Qualitative analysis of the magnetic and gravity anomalies was performed in order to determine the crustal boundary. It was integrated with in situ rock magnetic susceptibility and density data obtained in the laboratory to restrict the inversion process. The calculated models helped us to better constrain a regional structural lineament, named Las Norias fault. This fault divides two cortical blocks, the Central terrane and Oaxaquia microcontinent, whose physical properties and styles of deformation in the Mesozoic cover are very contrasting.

在墨西哥北部的科阿韦拉州和萨卡特卡斯州的边界上，三叠纪俯冲复合体的稀有露头已被用来推断构造地层的地界。地壳边界被一堆侏罗纪火山沉积岩和厚，折叠，逆冲的中生代海洋沉积演替所覆盖。我们使用磁和重力数据进行了详细的制图，地质剖面以及地球物理勘测，以对这些地壳块之间的掩埋边界进行建模。为了确定地壳边界，对磁和重力异常进行了定性分析。它与原位集成在实验室获得的岩石磁化率和密度数据限制了反演过程。计算模型有助于我们更好地约束一个名为Las Norias断层的区域构造线。这个断层将中央地层和Oaxaquia微大陆划分为两个皮质块，它们的物理性质和中生代盖层的变形方式非常不同。