MYTUTOR SUBJECT ANSWERS

3370 views

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

Metamorphism is a process by which preexisting rocks can be altered in composition or structure, to form a new rock. Regional metamorphism occurs in areas of above average pressures and temperatures, such as subduction zones. Shale is a sedimentary rock, which has a varied chemical composition, and it contains platy clay minerals that can align to pressure (associated with regional metamorphism).

 

Low-grade metamorphism (low pressure and temperature) of shale forms slate. Distinguishable by platy cleavage, where mica crystals align perpendicularly to pressure as well as the index mineral Biotite.

 

Medium-grade metamorphism (medium pressure and temperature) of shale forms schist. Schist is distinguishable by the index minerals Kyanite and/or Garnet, it may also show slight banding of dark/light minerals.

 

High-grade metamorphism (high pressure and temperature) of shale forms Gneiss. Gneiss shows very distinct banding between light and dark minerals, which have separated due to different compositions and has the index mineral Sillimanite.

 

It is important to point out that index minerals show the minimums pressure and temperatures the shale must have experienced. A metamorphosed shale may contain Biotite and Garnet (two minerals formed at different P+T), this shows that metamorphosed shale must have at least experienced medium grade metamorphism.

Josh S. A Level Geology tutor, GCSE Geology tutor, GCSE Geography tut...

2 years ago

Answered by Josh, an A Level Geology tutor with MyTutor


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

6 SUBJECT SPECIALISTS

PremiumOliver B. GCSE Chemistry tutor, GCSE Biology tutor, GCSE Geology tuto...
£36 /hr

Oliver B.

Degree: Medicine (PhD) (Doctorate) - Bristol University

Subjects offered:Geology, Science+ 5 more

Geology
Science
Physics
Extended Project Qualification
Chemistry
Biology
-Personal Statements-

“I have been teaching here since 2013 and use various teaching styles depending on what helps you to learn best!”

Rhiannon M. GCSE Environmental Studies tutor, A Level Environmental S...
£20 /hr

Rhiannon M.

Degree: Environmental Geoscience (Bachelors) - Durham University

Subjects offered:Geology, Maths+ 4 more

Geology
Maths
Geography
Environmental Studies
English Language
Chemistry

“Third year Earth Science student at Durham. Passionate about geology and the environment so hope to inspire curiosity in the Earth Sciences.”

MyTutor guarantee

£22 /hr

Daniel V.

Degree: Earth Sciences (Bachelors) - Durham University

Subjects offered:Geology, Geography+ 2 more

Geology
Geography
Chemistry
-Personal Statements-

“Geology at Durham. Exams were very stressful. Run charity society. Footballer. Teach in different styles, recaps. Keywords stuck everywhere. ”

About the author

Josh S.

Currently unavailable: for regular students

Degree: Earth Sciences (Masters) - Durham University

Subjects offered:Geology, Physics+ 2 more

Geology
Physics
Maths
Geography

“Hello, I'm Josh. I'm an undergraduate, currently in my third year, studying Earth Sciences (Geology) at Durham University.”

MyTutor guarantee

|  53 completed tutorials

You may also like...

Other A Level Geology questions

Describe how a delta forms.

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

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

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

View A Level Geology 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

mtw:mercury1:status:ok