Hydrothermally Altered Rock

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Hydrothermally Altered Rock

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Hydrothermally Altered Rock:
A rock in which the original minerals that the rock was composed of have been changed into new minerals by the process of flow of hydrothermal fluids through the rocks pore space and over its surface
Other definitions:Wikipedia Reegle


Hydrothermally altered rock at the Paleochori cliffs Milos, Greece. http://www.photovolcanica.com/VolcanoInfo/Milos/Milos.html

Hydrothermal alteration refers to rocks that have been altered from their original composition through water-rock interactions with a geothermal fluid. Different types of hydrothermal alteration are often indicative of the composition of the causative fluid, and are typically described via stable alteration mineral assemblages that have replaced preexisting minerals in a rock. Hydrothermal alteration may also refer to the selective removal of minerals by a fluid, as in the case of acid leaching.

Examples

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CSV
Geothermal
Resource
Area
Geothermal
Region
Control
Structure
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Akita Geothermal Field Northeast Honshu Arc Major Normal Fault Tertiary Dacite 88.3 MW88,300 kW
88,300,000 W
88,300,000,000 mW
0.0883 GW
8.83e-5 TW
548.15 K275 °C
527 °F
986.67 °R
Blue Mountain Geothermal Area Northwest Basin and Range Geothermal Region Intrusion Margins and Associated Fractures
Fault Intersection
Triassic Metasedimentary 49.5 MW49,500 kW
49,500,000 W
49,500,000,000 mW
0.0495 GW
4.95e-5 TW
470.15 K197 °C
386.6 °F
846.27 °R
Iwate Geothermal Area Northeast Honshu Arc Miocene; Pre-Tertiary Dacitic welded tuff; Marine Sediments Tuffs; Shales; Chert; Slate; Granodiorite 103.5 MW103,500 kW
103,500,000 W
103,500,000,000 mW
0.104 GW
1.035e-4 TW
578.15 K305 °C
581 °F
1,040.67 °R
Leyte Geothermal Area Philippine Island Arc Andesite 714.9 MW714,900 kW
714,900,000 W
714,900,000,000 mW
0.715 GW
7.149e-4 TW
553.15 K280 °C
536 °F
995.67 °R
Mutnovskaya Geothermal Area Kuril-Kamchatka Arc Fault Intersection Oligocene 62 MW62,000 kW
62,000,000 W
62,000,000,000 mW
0.062 GW
6.2e-5 TW
507.15 K234 °C
453.2 °F
912.87 °R