Influence of thermophilic bacteria on calcite and silica precipitation in hot springs with water temperatures above 90 °C: evidence from Kenya and New Zealand

Hot and boiling springs in Kenya and New Zealand that are emitting water with temperatures more than 90 °C are commonly characterized by a complex array of CaCO3 and SiO2 precipitates that have been formed through abiogenic and biogenic processes. Thermophilic bacteria are the only microbes that can survive in the boiling water that is discharged into pools around the spring orifice. Analysis of modern substrates from various springs in the Kenya Rift Valley and the Taupo Volcanic Zone in New Zealand shows that they are inhabited by a diverse array of coccoid and filamentous bacteria. In some areas these bacteria produce copious amounts of mucus that coat the substrates. Although the coccoid and filamentous bacteria provide substrates for CaCO3 and SiO2 precipitation, the microbes do not seem to have any direct influence on the morphology of the precipitates that are produced. Conversely, the mucus found in these hot spring pools selectively takes up elements such as Si, Mg, Al, and Fe, but is not calcifi...

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