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Application of stable chlorine isotopes to develop a conceptual model for the origin of the ground water circulating near the "salinas" at Rio Maior (Central Portugal). Source: Comunicaçõe Geológicas . 2013, Vol. 100 Issue 1, p49-53. 5p. Author(s): Eggenkamp, H. G. M.; Marques, J. M.; Graça, H. Abstract: The chlorine isotope composition (37Cl ) of the well "Fonte da Pipa" from which salt is produced in the "Salinas" in Rio Maior (Portugal) is -0.22‰ vs. SMOC. This value has been compared to the 37Cl of four nearby shallow fresh water wells. Wells west of a large NNE-SSW fault separating the Meso-Cenozoic Western Border from the Tagus Basin have 37Cl values of -0.34‰, -0.25‰ and -0.21‰ respectively, while a well east of this fault has a 37Cl value of +0.09‰. These results indicate that Cl- in the western wells has its origin in dissolving Cl- from the salt diapir that supplies NaCl to the salt exploitation, while the eastern well did not. Groundwater west of the fault originates from the nearby Serra dos Candeeiros. Rainwater infiltrates in karstic limestones and part of this water is flowing east where impermeable formations such as the salt diapir transport it back to the surface. Deeper groundwater interacts with the salt diapir and dissolves part of it. This water is sampled in the saline well "Fonte da Pipa" and used for salt exploitation. A small part of this Cl- is mixed into the overlying fresh water. Groundwater east of the fault has no interaction with salt from the salt diapir due to the hydrological situation at the fault, explaining the different 37Cl values east and west of the fault.
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