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Active analogies for old hot spring systems

Whakarewarewa geysers, Rotorua. White silica (SiO2) sinter deposits are formed as dissolved material is precipitated on cooling

Whakarewarewa geysers, Rotorua. White silica (SiO2) sinter deposits are formed as dissolved material is precipitated on cooling.

Champagne Pool, Waiotapu, near Rotorua. Silica sinter (white) also has encrustations of arsenic-rich mineral material (orange) deposited from cooling water

Champagne Pool, Waiotapu, near Rotorua. Silica sinter (white) also has encrustations of arsenic-rich mineral material (orange) deposited from cooling water. Arsenic is a common pollutant in streams draining thermal areas.