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Every volcano is a mountain, but not every mountain is a volcano. Still, it strikes me that--at least for the mountain ranges I can think of in this moment--they all seem to have igneous cores. Is this generally true, or are there plenty of examples of mountain ranges with sedimentary or metamorphic cores?

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  • $\begingroup$ What do you mean by "core"? After all, if you go deep enough, you get to igneous rocks eventually. $\endgroup$ – jamesqf Sep 18 at 18:59
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Many mountain ranges do not have igneous cores. The front ranges of the Rocky Mountains in British Columbia are created by thrust faults that push sedimentary strata up to form the mountains. The driving force for this motion is a subduction zone located 100's of kilometres to the west. I believe that the Himalayas mountains are formed in a similar fashion.

See the following Wikipedia article: Geology of the Rocky Mountains

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    $\begingroup$ I'm not a geologist, so I hesitate to edit, but I'm guessing that "thrush faults" is a tyop? Could somebody who is more sure than me (Friddy?) correct it if so? ;-) $\endgroup$ – Semidiurnal Simon Sep 18 at 3:24
  • $\begingroup$ @SemidiurnalSimon The link goes to "thrust fault", so it's easy to see what it's meant to be. You can edit a post and correct obvious mistakes yourself, pending review if your reputation is below a certain limit. $\endgroup$ – CJ Dennis Sep 18 at 6:26
  • $\begingroup$ @CJDennis there wasn't a link there when I left the comment! $\endgroup$ – Semidiurnal Simon Sep 18 at 16:42
  • $\begingroup$ @SemidiurnalSimon I realise that now. The person who added the link should have also fixed the spelling! $\endgroup$ – CJ Dennis Sep 18 at 21:49
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examples of mountain ranges with sedimentary or metamorphic cores

Mount Everest.

At an elevation of 7000 metres and higher, it is all sedimentary rock. Below 7000 metres, it is metamorphic of sedimentary protolith. There are some igneous intrusions into it, but the bulk is a metamorphic schist.

https://en.wikipedia.org/wiki/Mount_Everest#Geology

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