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Tania Karen Espinoza-Ju%u00e1rez et al. | 2085Consequently, factors such as fault-hosted mineralization, the proximity of water extraction wells to the faults, and the direction of groundwater flow may influence the presence of arsenic in groundwater.7. ConclusionsThe application of geophysical techniques in elucidating the geological context of the central Zimap%u00e1n municipality proved effective for identifying crystalline bodies associated with granitic intrusions. These intrusions, upon interacting with the carbonate sequence of the Soyatal and Doctor Formations, generated contact zones potentially linked to contact metasomatism and hydrothermal activity. Moreover, the correlation between these bodies was identified as the existence of mineralization linked to iron sulfide deposits, which occupy the geological faults within the research area. According to the geophysical and hydrogeochemical results, the contamination is primarily attributable to a combination of three factors: the direction of groundwater flow, the presence of mineralization, and proximity to fault-type geological structures. Consequently, while other contaminant sources exist in this area, the predominant source is of natural origin. The amalgamation of geophysical and hydrogeochemical techniques in the examination of the Zimap%u00e1n aquifer has yielded Figure 11. Arsenic concentrations in wells located within the geological map of the region and the mineralization identified throw the geophysical method. The groundwater flow network was estimated from indirect measurements with PQWT- TC500 water detector (Table 1). *S.W.L. Confluence = Static Water Level Confluence).a comprehensive understanding of its underlying dynamics and water quality. The detection of fault-related lineaments, densely concentrated bodies, and mineralization linked to iron sulfides, together with their association to arsenic distribution, underscores the efficacy of integrating both approaches.8. AcknowledgementsWe express our gratitude to O. Cruz, A. Aguayo and O. Neri from the Laboratorio de Qu%u00edmica Anal%u00edtica of the Institute of Geophysics, to PAPIIT for providing the economic resources to finance this project, PAPIIT IN105023. The Secretar%u00eda de Ciencia, Humanidades, Tecnolog%u00eda e Innovaci%u00f3n (Secihti), where the first author is currently a Secihti scholarship holder at the graduate level.9. ReferencesAlabi, A. A., Popoola, O. I., Olurin, O. T., Ogungbe, A. S., Ogunkoya, O. A., & Okediji, S. O. (2020). Assessment of groundwater potential and quality using geophysical and physicochemical methods in the basement terrain of Southwestern, Nigeria. Environmental Earth Sciences, 79, 1-13. doi: https://doi.org/10.1007/s12665-020-09107-yAiro, M.-L., & Loukola-Ruskeeniemi, K. (2004). Characterization of Concentration (mg/L) As %u2022 0.004 e 0.006 e 0.029 %u2022 0.061 %u2022 0.103 %u2022 0.472 %u2022 0.516 .0.81 01.212 01.866 Cenozoic Alluvial Symbology Polygenic conglomerate Polygenic conglomerate - sandstone %u2022 Andesite - Basaltic Andesite - Dacite Basaltic Rhyolite - rhyolitic tuff %u2022 Rhyolitic tuff - dacitic tuff Mezozoic Shale - Limestone Limestone - Monogenetic Sedimentary Breccia %u2022 Limestone - Dolomite %u2022 Limestone - Shale ..__._ Fault (SGM, 2002) ~ Mines - Fault(INEGI, 2010) D Zimap%u00e1n Region /l Flow lines - Main hydraulic load lines - Second hydraulic load lines - Recharge areas Limits of the Tula River Basin Limits of the Moctezuma - River Basin %u25a1 S.W.L. confluence Polygon 1 D Polygon2