Explain why the Composition of the Plagioclase Feldspar may vary within an Intrusion.

  • Google+ icon
  • LinkedIn icon

Ca plagioclase forms early meaning that it settles down through the magma body and forms in the lower part of the intrusion and solidifies. Na rich plagioclase forms later so is only present in the middle and upper parts of the intrusion – the part of the intrusion which solidifies last. 

Arthur G. GCSE Geology tutor, A Level Geology tutor, GCSE Chemistry t...

About the author

is an online A Level Geology tutor with MyTutor studying at Exeter University

Still stuck? Get one-to-one help from a personally interviewed subject specialist.

95% of our customers rate us

Browse tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss