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<p>The regional influence of deep-seated igneous intrusions on the structural and hydrogeological characteristics of the Upper Guayalejo-Tamesi Basin (UGT), a karstic region in northeastern Mexico, is examined. Using aeromagnetic data, satellite-based structural mapping, and groundwater hydrogeochemistry, the connections between subsurface plutons, fracture networks, and groundwater flow were explored. Aeromagnetic anomalies suggest the presence of seven intrusive bodies at depths ranging from 0.345 to 5.3 km. Two of the largest aeromagnetic anomalies, A and B, were related to plutonic intrusions, named Río Frio and Sabinas, respectively, and are associated with radial and concentric fracture patterns on the surface (damage zones), implying magma-induced fracturing. In the Río Frio pluton, two damage zones (A1 and A2) were identified. A1 is associated with eruption and possible caldera collapse. A2 is associated with magma stalling, lateral spreading of the main body, and a broad domal uplift. A total of 481 karst depressions were identified, with the highest densities found near Anomaly A, most of them within damaged zone A2. This association indicates that lithology, climate, and fractures linked to plutons collectively influence karst development. Hydrogeochemical analysis revealed that groundwater near plutons showed chemical signs of local to intermediate flow and silicate weathering. Groundwater farther from plutons exhibited regional flow systems, evaporite influence, and cation exchange. The findings demonstrate that buried plutons have a lasting structural influence by shaping fracture patterns that guide karst formation and groundwater movement. The study’s integrative approach offers an understanding of fracture-controlled hydrogeology in karst terrains affected by deep magmatic processes.</p>

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Assessment of long-term structural controls of pluton emplacement in karst systems: Geophysical, structural, and hydrogeochemical analyses in the Upper Guayalejo-Tamesi River Basin, Tamaulipas, Mexico

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Oscar Guevara-Mansilla,
  • Tomás A. Peña-Alonso,
  • René Ventura-Houle,
  • Salvador Ibarra-Martínez,
  • Randall Guevara

摘要

The regional influence of deep-seated igneous intrusions on the structural and hydrogeological characteristics of the Upper Guayalejo-Tamesi Basin (UGT), a karstic region in northeastern Mexico, is examined. Using aeromagnetic data, satellite-based structural mapping, and groundwater hydrogeochemistry, the connections between subsurface plutons, fracture networks, and groundwater flow were explored. Aeromagnetic anomalies suggest the presence of seven intrusive bodies at depths ranging from 0.345 to 5.3 km. Two of the largest aeromagnetic anomalies, A and B, were related to plutonic intrusions, named Río Frio and Sabinas, respectively, and are associated with radial and concentric fracture patterns on the surface (damage zones), implying magma-induced fracturing. In the Río Frio pluton, two damage zones (A1 and A2) were identified. A1 is associated with eruption and possible caldera collapse. A2 is associated with magma stalling, lateral spreading of the main body, and a broad domal uplift. A total of 481 karst depressions were identified, with the highest densities found near Anomaly A, most of them within damaged zone A2. This association indicates that lithology, climate, and fractures linked to plutons collectively influence karst development. Hydrogeochemical analysis revealed that groundwater near plutons showed chemical signs of local to intermediate flow and silicate weathering. Groundwater farther from plutons exhibited regional flow systems, evaporite influence, and cation exchange. The findings demonstrate that buried plutons have a lasting structural influence by shaping fracture patterns that guide karst formation and groundwater movement. The study’s integrative approach offers an understanding of fracture-controlled hydrogeology in karst terrains affected by deep magmatic processes.