Caldera Depression

Jump to: navigation, search
GEOTHERMAL ENERGYGeothermal Home
Print PDF


Caldera Depression

Dictionary.png
Caldera Depression:
Calderas form from the catastrophic eruption of large amounts of felsic lava and ash. Emptying of the magma chamber and subsequent collapse of the overlying volcanic edifice forms a ring-shaped caldera depression up to several kilometers in diameter. The edges of the underlying magma chamber are roughly marked by a ring fracture zone that acts as a conduit for ongoing volcanism and hydrothermal activity.
Other definitions:Wikipedia Reegle


Topographic Features

List of topographic features commonly encountered in geothermal resource areas:

Calderas form from the catastrophic eruption of large amounts of felsic lava and ash. Emptying of the magma chamber and subsequent collapse of the overlying volcanic edifice forms a ring-shaped caldera depression up to several kilometers in diameter. The edges of the underlying magma chamber are roughly marked by a ring fracture zone that acts as a conduit for ongoing volcanism and hydrothermal activity.

Calderas are capable of expelling large amounts of volcanic material in a single eruptive event, leaving behind regionally extensive ash fall deposits. For example, the Bishop Tuff, deposited during the eruption of the Long Valley Caldera 767,100 ± 900 years ago, covers a 2,200 square-kilometer region of the southwestern United States.

Examples

Want to add an example to this list? Select a Geothermal Resource Area to edit its "Topographic Features" property using the "Edit with Form" button.

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 Rift Zone
Extensional Tectonics
Precambrian Crystalline basement “pCu” (undifferentiated in map units); Biotite Granodiorite (Phase I Reservoir); Gneiss, Schist, Granodiorite, Granite, Metavolcanic Rocks (Phase II Reservoir) 20 MW20,000 kW
20,000,000 W
20,000,000,000 mW
0.02 GW
2.0e-5 TW
508.15 K235 °C
455 °F
914.67 °R
Fukushima Geothermal Area Northeast Honshu Arc Subduction Zone 65 MW65,000 kW
65,000,000 W
65,000,000,000 mW
0.065 GW
6.5e-5 TW
579.15 K306 °C
582.8 °F
1,042.47 °R
Hachijojima Geothermal Area Northeast Honshu Arc Subduction Zone 3.3 MW3,300 kW
3,300,000 W
3,300,000,000 mW
0.0033 GW
3.3e-6 TW
556.15 K283 °C
541.4 °F
1,001.07 °R
Lahendong Geothermal Area Minahasa Volcanic Zone Subduction Zone Miocene Andesite 80 MW80,000 kW
80,000,000 W
80,000,000,000 mW
0.08 GW
8.0e-5 TW
578.15 K305 °C
581 °F
1,040.67 °R
Lihir Geothermal Area Papua New Guinea Geothermal Region Subduction Zone Basalt; Breccias; Tuffs 56 MW56,000 kW
56,000,000 W
56,000,000,000 mW
0.056 GW
5.6e-5 TW
548.15 K275 °C
527 °F
986.67 °R
Miyagi Geothermal Area Northeast Honshu Arc Subduction Zone Miocene Basalt 12.5 MW12,500 kW
12,500,000 W
12,500,000,000 mW
0.0125 GW
1.25e-5 TW
523.15 K250 °C
482 °F
941.67 °R
Mokai Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
Quaternary Volcaniclastic 112 MW112,000 kW
112,000,000 W
112,000,000,000 mW
0.112 GW
1.12e-4 TW
568.15 K295 °C
563 °F
1,022.67 °R
Mori Geothermal Area Kuril-Kamchatka Arc Subduction Zone Pre-Tertiary Limestone 50 MW50,000 kW
50,000,000 W
50,000,000,000 mW
0.05 GW
5.0e-5 TW
513.15 K240 °C
464 °F
923.67 °R
Pauzhetskaya Geothermal Area Kuril-Kamchatka Arc Subduction Zone Tuff 27 MW27,000 kW
27,000,000 W
27,000,000,000 mW
0.027 GW
2.7e-5 TW
468.15 K195 °C
383 °F
842.67 °R
Sumatra-Sibayak Geothermal Area Sunda Volcanic Arc - Great Sumatra Fault Zone Subduction Zone Tertiary Sandstone; Limestone 12 MW12,000 kW
12,000,000 W
12,000,000,000 mW
0.012 GW
1.2e-5 TW
543.15 K270 °C
518 °F
977.67 °R
Valles Caldera - Redondo Geothermal Area Rio Grande Rift Rift Zone
Extensional Tectonics
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 Rift Zone
Extensional Tectonics
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”
Wairakei-Poihipi Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
Quaternary Volcaniclastic 352 MW352,000 kW
352,000,000 W
352,000,000,000 mW
0.352 GW
3.52e-4 TW
483.15 K210 °C
410 °F
869.67 °R

References