I am not a geologist/geology student but I want to quickly know the influence of volcanic rock type to geothermal suitability. I have read read some journals and online articles but it seems there are a lot of ways different mappers/researchers name geologic unit. What I am trying to do is rank types of volcanic rocks ex. the legend on the image to most influential to less influential to the geothermal suitability. A direct answer is cool but also welcome articles or readings regarding this. Thanks!

Legend: enter image description here

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    $\begingroup$ What is "geothermal suitability "? $\endgroup$ May 16 at 19:09
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    $\begingroup$ This appears to be a stratigraphic succession from the Philippines. Geothermal energy is available in many different geological contexts, but simplistically one might expect it to be most common in the youngest volcanic rocks and active volcanic systems. $\endgroup$
    – Andy M
    May 16 at 21:03
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    $\begingroup$ There are different ways to exploit geothrmal energy, using the natural gradient in an area or a heatpump into an aquifer come to my mind. Wouldn't it have to be checked in any individual case ? $\endgroup$
    – user22279
    May 16 at 22:20
  • $\begingroup$ geothermal suitability - in my context is contextualizing the potential of geothermal resources in the area, so I want to know, from my list which rocks have more influence such that there is higher possibility of geothermal resources $\endgroup$
    – Nikko
    May 17 at 2:55
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    $\begingroup$ geothermal suitability in your definition (pretty much any definition) is a system problem. you can't look at an individual rock type or lithology in isolation. the different styles of system that @Earthworm gives examples of can be formed from a wide variety of geology and tectonic setting. $\endgroup$ May 17 at 6:50

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