CV-2b: Plutonic - Inactive Volcanism

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CV-2b: Plutonic - Inactive Volcanism

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CV-2b: Plutonic - Inactive Volcanism:
A plutonic geothermal play type with inactive volcanism is related to the placement of felsic plutons and is a characteristic of mature subduction zones and decaying volcanism in continental crust.
Other definitions:Wikipedia Reegle


The dry steam geothermal area at The Geysers in Northern California is the largest producer of geothermal energy in the world (reference: pubs.usgs.gov)

Plutonic plays without recent volcanism exist in mature subduction zones where volcanism is decaying in the crust. The geothermal heat is related to the placement of felsic plutons in the crust. [1]

Famous plutonic geothermal plays associated with inactive volcanism include The Geysers dry steam resource in Northern California, the largest producing field of geothermal energy on Earth.

According to Moeck and Beardsmore, plutonic geothermal plays without volcanic activity typically have the following properties:[2]

  • Geologic Setting – Convergent Margins with Recent Plutonism (< 3 Ma), Young Orogens, Post-orogenic Phase
  • Heat Source/Storage Properties of Reservoir – Young Intrusion+Extension, Felsic Pluton, Heat Producing Element Rock
  • Dominant Heat Transport Mechanism – Hydrothermal Circulation, Fault Controlled







Examples

Want to add an example to this list? Select a Geothermal Resource Area to edit its "Moeck-Beardsmore Play Type" property using the "Edit with Form" button.

CSV
Geothermal
Resource
Area
Geothermal
Region
Control
Structure
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Boyes Hot Springs Geothermal Area Holocene Magmatic
Calistoga Hot Springs Geothermal Area Holocene Magmatic
Clear Lake Geothermal Area Holocene Magmatic
Geysers Geothermal Area Holocene Magmatic Pull-Apart in Strike-Slip Fault Zone Mesozoic metamorphosed sandstone 1,585 MW1,585,000 kW
1,585,000,000 W
1,585,000,000,000 mW
1.585 GW
0.00159 TW
551.15 K278 °C
532.4 °F
992.07 °R
Geysers Hi-T Reservoir Geothermal Area Holocene Magmatic
Sonoma Mission Inn Geothermal Area Holocene Magmatic
Wilbur Springs Geothermal Area Holocene Magmatic


References

  1. 1.0 1.1 Inga S. Moeck,Graeme Beardsmore. 2014. A New 'Geothermal Play Type' Catalog: Streamlining Exploration Decision Making. In: Proceedings. Thirty-Ninth Workshop on Geothermal Reservoir Engineering; 2014/02/24; Stanford, California. Stanford, California: Stanford University; p. 8
  2. Inga Moeck. 2013. Geothermal Plays in Geologic Settings. In: IGA Workshop on Developing Best Practice for Geothermal Exploration and Resource/Reserve Classification; 2013/11/14; Essen, Germany. IGA website: International Geothermal Association; p. 19