During folding, how are joints formed in sandstone and cleavage formed in shale?

When beds undergo folding, the fold hinge stretches and experiences tension which can create extensional joints during compression. Often the fractures will infill with a mineral precipitate, forming a vein. Due to shale being composed of platy, clay minerals, the grains will rotate and align perpendicular to the direction of applied stress. If the cleavage forms at the same time as the fold, it will be parallel to the axial plane. For both of these answers, an evolutionary diagram would be required for clarity and to display understanding of the processes.

RM
Answered by Rhiannon M. Geology tutor

4437 Views

See similar Geology A Level tutors

Related Geology A Level answers

All answers ▸

Describe the sequence and composition of an Ophiolite and evaluate its use in understanding the Oceanic Lithosphere


Describe how regional metamorphism of shale produces a sequence of rocks and minerals.


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


Describe the differences in internal morphology that can be seen between a Nautilus and Ammonite


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences