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Zuñi Salt Lake

Saltwater lake in New Mexico, US

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  • 3 chapters

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Description

Zuñi Salt Lake is extremely shallow, with a depth of only 4 feet (1.2 m) in the wet season. During the dry season, much of the water evaporates leaving behind salt flats. The lake contains brine shrimp (Artemia salina), alkali flies (Ephydra hians) and cyanobacteria (Anacystis) that are able to endure the extreme fluctuations in conditions between the wet and dry seasons.

The lake fills a maar, a kind of shallow volcanic crater formed when magma (molten rock) comes into contact with groundwater. The groundwater explodes into steam, shattering the surrounding rock and blasting particles of rock and magma into the air. The maar erupted in the Late Pleistocene, between 114 and 86 thousand years ago. The salt comes from both surface runoff into the lake and buried salt beds of the Permian Supai Formation underneath the maar. Groundwater rises through the salt beds and emerges along fractures in the volcanic conduits beneath the maar. Salt accumulates because the maar has no natural outlet.

The lake was listed on the National Register of Historic Places in 1999. It is part of the Red Hill volcanic field.

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