Silicification
From Open Energy Information
Silicification:
A process in which the original minerals of a rock become replaced by silicate minerals, this process is caused by the flow of aqueous silica solution through the rocks pore space and over its surface
Relict Geothermal Features
Typical list of modern geothermal features
Silicification refers to the addition of silica to a rock by a hydrothermal fluid. Silicification is often visually non-distinct, but results in hardening of the rock that is readily detectable using a scratcher tool.
Examples
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| Geothermal Resource Area | Geothermal Region | Control Structure | Host Rock Age | Host Rock Lithology | Mean Capacity | Mean Reservoir Temp |
|---|---|---|---|---|---|---|
| Blue Mountain Geothermal Area | Northwest Basin and Range Geothermal Region | Fault Intersection Intrusion Margins and Associated Fractures | Triassic | Metasedimentary | 49.5 MW49,500 kW <br />49,500,000 W <br />49,500,000,000 mW <br />0.0495 GW <br />4.95e-5 TW <br /> | 470.15 K197 °C <br />386.6 °F <br />846.27 °R <br /> |
| Salt Wells Geothermal Area | Northwest Basin and Range Geothermal Region | 23.6 MW23,600 kW <br />23,600,000 W <br />23,600,000,000 mW <br />0.0236 GW <br />2.36e-5 TW <br /> | 466.15 K193 °C <br />379.4 °F <br />839.07 °R <br /> | |||
| Sumatra-Sibayak Geothermal Area | Sunda Volcanic Arc - Great Sumatra Fault Zone | Fault Intersection | Tertiary | Sandstone; Limestone | 12 MW12,000 kW <br />12,000,000 W <br />12,000,000,000 mW <br />0.012 GW <br />1.2e-5 TW <br /> | 543.15 K270 °C <br />518 °F <br />977.67 °R <br /> |