# Salin Formation

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**Salin Formation** (Spanish: *Formación Salin*) is a [geological formation](/source/Geological_formation) composed of alternations of volcanic [sand](/source/Sand), [silt](/source/Silt) and [gravel](/source/Gravel) in inland [Antofagasta Region](/source/Antofagasta_Region), northern [Chile](/source/Chile).[1][2] The formation is poorly consolidated and include layers of [volcanic ash](/source/Volcanic_ash) and [evaporite](/source/Evaporite) as well as lacustrine sediments.[1][3] The formation is overlaid by a permeable [ignimbrite](/source/Ignimbrite).[2] Based on [geochemical](/source/Geochemistry) similarities [Socompa](/source/Socompa) volcano may be the source for the upper units of the formation.[4] The formation is the main water-bearing geological unit of the [Monturaqui-Negrillar-Tilopozo Aquifer](/source/Monturaqui-Negrillar-Tilopozo_Aquifer).[1][5] The formation has been estimated to have medium to high [permeability](/source/Permeability_(porous_media)).[3]

## References

1. Rissmann et al. 2015, p. 165.

1. Bravo Castro 2021, p. 57.

1. Lelli 2018, p. 23.

1. Rissmann et al. 2015, p. 166.

1. Anderson, Low & Foot 2002, p. 135.

**Bibliography**

- Anderson, Mark; Low, Rob; Foot, Stephen (January 2002). ["Sustainable groundwater development in arid, high Andean basins"](https://www.lyellcollection.org/doi/10.1144/GSL.SP.2002.193.01.11). *Geological Society, London, Special Publications*. **193** (1): 133–144. [Bibcode:2002GSLSP.193..133A](https://ui.adsabs.harvard.edu/abs/2002GSLSP.193..133A). [doi:10.1144/GSL.SP.2002.193.01.11](https://doi.org/10.1144/GSL.SP.2002.193.01.11). [ISSN 0305-8719](https://www.worldcat.org/issn/0305-8719). [S2CID 130277537](https://api.semanticscholar.org/CorpusID:130277537)
- Bravo Castro, Pedro Ignacio (2021). [*Estudio hidraúlico de aguas subterráneas de la zona de Monturaqui, Salar de Atacama, Chile*](https://repositorio.uchile.cl/handle/2250/182181) (in Spanish). [University of Chile](/source/University_of_Chile). Retrieved 2025-07-22.
- Lelli, Matteo (2018). [*SOCOMPA GEOTHERMAL PROSPECT: Report on waters geochemistry*](https://repositorio.segemar.gob.ar/bitstream/handle/308849217/2430/Socompa_Report_Geochemistry.pdf?sequence=1&isAllowed=y). Retrieved 2025-07-07.
- Rissmann, Clinton; Leybourne, Matthew; Benn, Chris; Christenson, Bruce (March 2015). "The origin of solutes within the groundwaters of a high Andean aquifer". *Chemical Geology*. **396**: 164–181. [Bibcode:2015ChGeo.396..164R](https://ui.adsabs.harvard.edu/abs/2015ChGeo.396..164R). [doi:10.1016/j.chemgeo.2014.11.029](https://doi.org/10.1016/j.chemgeo.2014.11.029)

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