Hydrogeochemical processes in aquifers of volcano-sedimentary origin using inverse modeling. (August 2022)

• Record Type: Journal Article
• Authors: Morán-Ramírez, J.; Ramos-Leal, J.A.; Fuentes-Rivas, R.M.; Arango-Galvan, C.; Fonseca-Montes de Oca, R.M.G.; Marín-Celestino, A.E.; Sandoval-Montes, I.C.
• Is Part Of: Journal of South American earth sciences. Volume 117(2022)
• Publication Date: 2022-08
• Subjects: Hydrogeochemistry -- Mixing -- Hydrogeochemical modeling -- Rock water interaction -- Mixing fractions; Geology -- Latin America -- Periodicals; Earth sciences -- Latin America -- Periodicals; Geology -- Antarctica -- Periodicals; Earth sciences -- Antarctica -- Periodicals; Geology -- Caribbean Area -- Periodicals; Earth sciences -- Caribbean Area -- Periodicals; Géologie -- Amérique latine -- Périodiques; Sciences de la terre -- Amérique latine -- Périodiques; Géologie -- Antarctique -- Périodiques; Sciences de la terre -- Antarctique -- Périodiques; Géologie -- Caraïbes (Région) -- Périodiques; Sciences de la terre -- Caraïbes (Région) -- Périodiques; Earth sciences; Geology; Antarctica; Caribbean Area; Latin America; Periodicals; 550.5
• DOI: 10.1016/j.jsames.2022.103888
• Languages: English
• ISSNs: 0895-9811

Abstract

Abstract: The study area is located in the Trans-Mexican Neovolcanic Belt. A complex hydrogeological system was approached, composed of metamorphic rocks, covered by sedimentary rocks of marine origin and folded, covered by tertiary clastic rocks and a volcanic sequence of Quaternary age. The main objective of this research was to carry out a hydrogeochemical characterization to identify hydrogeochemical processes. The interaction with different geological units and anthropogenic activities produces different water types (facie Ca–Mg–Na–HCO3 –SO4 in the urban area, Ca–Na–Mg–HCO3 agricultural area). It was determined that the local flow contributes 55%, the intermediate 26%, and the regional 19% with ternary mixtures model. With speciation diagrams, the conditions of chemical equilibrium in the aquifer are determined. Given this scenario, inverse modeling was applied in a cross-section to identify water interaction with the different types of geological materials through which it circulates and anthropogenic activities. The inverse modeling in cross-section 71-61, from the Pico de Orizaba recharge zone, indicates that the main processes present are altering silicates and clays (albite, illite, Ca-montmorillonite, gibbsite; dolomite, halite and gypsum dissolution; calcite and kaolinite formation). In cross-section 61-51, the model shows albite, gibbsite, Ca-montmorillonite alteration; dolomite and halite dissolution; also, calcite, gypsum, kaolinite, and illite formation. In cross-section 51-53, the modeling indicates albite, gibbsite, illite, Ca-montmorillonite alteration; halite and dolomite dissolution; also, gypsum, calcite, kaolinite, formation; NH3 (g), NH4, N (2) (g), ion exchange of NaX. The organic matter plays an essential role in REDOX conditions due to anthropogenic activities of the study area. Graphical abstract: Image 1 Highlights: The main groundwater families are Ca–HCO3 and Na–Ca–HCO3 . Local flow contributes 55%, intermediate 26% and regional with 19% to the system. In the system occurs mixtures, alteration of silicates, dolomites, gypsum, clay formation and ion exchange.