Zeolite minerals are typically associated with which geologic setting?

Zeolite minerals are typically associated with which geologic setting?

• A. Low temperature, low pressure, diagenesis
• B. High temperature, high pressure
• C. High temperature, low pressure
• D. Low temperature, high pressure

Answer: (A)

Zeolite minerals form under relatively cool, shallow conditions in the diagenetic stage of sedimentary rocks. As circulating fluids alter volcanic ash and other siliceous materials in sediments, the hydrated aluminosilicate framework of zeolites crystallizes at low temperatures and pressures typical of diagenesis. This association with volcanic ash–rich beds and pore-water alteration explains why zeolites are common in diagenetic settings rather than in high-temperature metamorphic or deep hydrothermal environments.

Zeolite minerals form under relatively cool, shallow conditions in the diagenetic stage of sedimentary rocks. As circulating fluids alter volcanic ash and other siliceous materials in sediments, the hydrated aluminosilicate framework of zeolites crystallizes at low temperatures and pressures typical of diagenesis. This association with volcanic ash–rich beds and pore-water alteration explains why zeolites are common in diagenetic settings rather than in high-temperature metamorphic or deep hydrothermal environments.