CV-1b: Magmatic - Intrusive

GEOTHERMAL ENERGY

CV-1b: Magmatic - Intrusive:

intrusive refers to igneous rock formation in which hot magma cools underneath the surface of the earth. Intrusive magmatic plays are characterized by intrusive volcanism.

Other definitions:Wikipedia Reegle

Moeck-Beardsmore Play Types

This classification scheme was developed by Moeck and Beardsmore, as reported in A New 'Geothermal Play Type' Catalog: Streamlining Exploration Decision Making.

• Convection-Dominated Geothermal Systems
  • Magmatic Geothermal Play Type
    • CV-1a: Extrusive
    • CV-1b: Intrusive
  • Plutonic Geothermal Play Type
    • CV-2a: Recent or Active Volcanism
    • CV-2b: Inactive Volcanism
  • CV-3: Extensional Domain
• Conduction-Dominated Geothermal Systems
  • CD-1: Intracratonic Basin
  • CD-2: Orogenic Belt
  • CD-3: Crystalline Rock - Basement

Geysers in the Taupo Volcanic Zone in New Zealand (reference: www.renewbl.com)

Intrusive magmatic plays are characterized by intrusive volcanism; thus no active volcanism above the surface exists. These deep rooted magma features cause faulting, allowing fluids and gases to rise to the surface creating hot springs, fumaroles, boiling mud pools and other geothermal manifestations.

Famous magmatic geothermal plays associated with intrusive activity include the Taupo Volcanic Zone in New Zealand.

A cross section view of the Taupo Volcanic Zone in New Zealand (ref: Book: North New Zealand)

According to Moeck and Beardsmore, magmatic-intrusive geothermal plays typically have the following properties:

• Geologic Setting – Magmatic Arcs, Mid Oceanic Ridges, Hot Spots
• Heat Source/Storage Properties of Reservoir – Active Volcanism, Shallow Magma Chamber
• Dominant Heat Transport Mechanism – Magmatic-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" option.

CSV

Geothermal Resource Area	Geothermal Region	Control Structure	Host Rock Age	Host Rock Lithology	Mean Capacity	Mean Reservoir Temp
Long Valley Caldera Geothermal Area	Walker-Lane Transition Zone	Displacement Transfer Zone	Quaternary	Bishop Tuff, Metamorphic Basement	38 MW 38,000 kW 38,000,000 W 38,000,000,000 mW 0.038 GW 3.8e-5 TW	513.15 K 240 °C 464 °F 923.67 °R
Ohaaki Geothermal Area	Taupo Volcanic Zone	Fault Intersection	Quaternary	Volcaniclastic	122 MW 122,000 kW 122,000,000 W 122,000,000,000 mW 0.122 GW 1.22e-4 TW	538.15 K 265 °C 509 °F 968.67 °R