Changes

=== High temperature fields (T>150ºC) ===

=== High temperature fields (T>150ºC) ===

: These deposits are found in áreas of higher igneous activity.They are related to extremely high gradients, corresponding to global tectonic process.They occur in plate borders, cortical thinnes áreas or Hot Spots. They need an igneous source an aquifer and a impermeable layer to keep up pressure. In many cases there is surface evidence suchs as geysers and fumaroles, [[File: Simplified diagram of a geotermal power plant.png|thumbnail|center|Simplified diagram of a geotermal power plant. [http://www.bgs.ac.uk/research/energy/geothermal/].]]

High temperature fields are found in areas of higher igneous activity. They are related to extremely high gradients, corresponding to global tectonic process. They occur in plate borders, cortical thin areas or hot spots. They need an igneous source, an aquifer, and a impermeable layer to keep up pressure. In many cases, there is surface evidence such as geysers and fumaroles.

 

[[File: Simplified diagram of a geotermal power plant.png|frame|center|Simplified diagram of a geothermal power plant.<ref>[http://www.bgs.ac.uk/research/energy/geothermal/ British Geological Survey]</ref>]]

 

=== Hot dry Rock Deposits or Geotermal Stimulated Systems ===

=== Hot dry Rock Deposits or Geotermal Stimulated Systems ===

: They are a kind of high temperature field but in wich the content  off water and permeability is  improved artificially by means of hydraulic fracture (the same method used in unconventional hydrocarbons resources).An example of this is the Soultz-sous-Forets Geothermal Field in France,where the heat source is a fractured granitic pluton

: They are a kind of high temperature field but in wich the content  off water and permeability is  improved artificially by means of hydraulic fracture (the same method used in unconventional hydrocarbons resources).An example of this is the Soultz-sous-Forets Geothermal Field in France,where the heat source is a fractured granitic pluton