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

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. 

AG
Answered by Arthur G. Geology tutor

3685 Views

See similar Geology A Level tutors

Related Geology A Level answers

All answers ▸

What are the similarities and differences between Irregular and Regular Echinoids?


Describe the Difference Between ‘Faults’ and ‘Joints’ in Rocks.


Which fossil group will show 5-fold (Pentameral) symmetry, is composed of plates, a mouth and an anus on opposite surfaces?


State the 3 different types of plate boundaries, and describe their movement.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences