Resurgent Dome Complex

Resurgent Dome Complex:

Resurgent domes are encountered near the center of many caldera depressions, and form via uplift of the caldera valley floor due to movement in the underlying magma chamber. Resurgent domes typically host numerous deformation structures that act as conduits for hydrothermal fluids in the shallow crust.

Other definitions:Wikipedia Reegle

Topographic Features

List of topographic features commonly encountered in geothermal resource areas:

A conceptual drawing of the Long Valley Caldera, California, illustrating the formation of a resurgent dome. http://www.iub.edu/~sierra/papers/2012/pardoski.html

Resurgent domes are encountered near the center of many caldera depressions, and form via uplift of the caldera valley floor due to movement in the underlying magma chamber. Resurgent domes do not form via eruption of lava, but from the migration of magma in the subsurface that results in deformation of the overlying crust. Resurgent domes typically host numerous deformation structures that act as conduits for hydrothermal fluids in the shallow crust.

Examples

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CSV

Geothermal Resource Area	Geothermal Region	Tectonic Setting	Host Rock Age	Host Rock Lithology	Mean Capacity	Mean Reservoir Temp
Fenton Hill HDR Geothermal Area	Rio Grande Rift	Extensional Tectonics Rift Zone	Precambrian	Crystalline basement “pCu” (undifferentiated in map units); Biotite Granodiorite (Phase I Reservoir); Gneiss, Schist, Granodiorite, Granite, Metavolcanic Rocks (Phase II Reservoir)	20 MW 20,000 kW 20,000,000 W 20,000,000,000 mW 0.02 GW 2.0e-5 TW	508.15 K 235 °C 455 °F 914.67 °R
Valles Caldera - Redondo Geothermal Area	Rio Grande Rift	Extensional Tectonics Rift Zone	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	Extensional Tectonics Rift Zone	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”

References