Zeolitic Alteration

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Zeolitic Alteration

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Zeolitic Alteration:
Hydrothermal alterations in which minerals from the zeolite group are introduced
Other definitions:Wikipedia Reegle


Epistilbite, a mineral in the zeolite group. This photo shows epistilbite in hydrothermally altered basalt from the Puu O Ehu quarry, Lanakai Hills, Kailua,Oahu, Hawaii. http://www.iza-online.org/natural/Datasheets/Epistilbite/epistilbite.htm

Zeolite minerals, including mordenite and clinoptilolite, have been identified in a number of caldera systems. These and other zeolite minerals are regionally extensive, and their formation is associated with late stage degassing of magmatic fluids and mixing with meteoric water.

Examples

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CSV
Geothermal
Resource
Area
Geothermal
Region
Control
Structure
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Valles Caldera - Redondo Geothermal Area Rio Grande Rift Fault Intersection
Stratigraphic Boundaries
Caldera Rim Margins
Mississippian-Pennsylvanian; Pleistocene, 1.6 to 1.25 Ma Limestone-Madera Formation “MIPu”; Rhyolitic tuff-Intracaldera Bandelier Tuff (upper Tshirege “Qbt” and lower Otowi “Qbo” members); Caldera Fill Rhyolite (shallow)
Valles Caldera - Sulphur Springs Geothermal Area Rio Grande Rift Fault Intersection
Stratigraphic Boundaries
Caldera Rim Margins
Precambrian; Mississippian-Pennsylvanian; Pleistocene, 1.6 to 1.25 Ma; Pliocene; Miocene Crystalline basement “pCu”; Limestone-Madera Formation “MIPu”; Rhyolitic tuff-Bandelier Tuff (upper Tshirege “Qbt” and lower Otowi “Qbo” members); Caldera Fill Rhyolite (shallow); Dacitic/Andesitic to Rhyolitic lavas and tuffs-Keres Group Volcanics (shallow); Santa Fe Group volcaniclastics “Tsf”